Question 1

Two objects are dropped from a bridge,an interval of 1.0 s apart.Air resistance is negligible.During the time that both objects continue to fall,their separation

Accepted Answer

Since air resistance is negligible, both objects accelerate at the same rate due to gravity. The second object starts falling 1 second later, so the first object has a head start. As both accelerate equally, the distance between them increases over time.

Question 2

Two objects are thrown from the top of a tall building.One is thrown up,and the other is thrown down,both with the same initial speed.What are their speeds when they hit the street? Neglect air resistance.

Accepted Answer

Both objects experience the same acceleration due to gravity, regardless of their initial direction, because they both have the same initial speed. Therefore, they both reach the ground with the same speed. The height of the building does not affect this result.

Question 3

If the position versus time graph of an object is a horizontal line,the object is

Accepted Answer

A horizontal line on a position versus time graph indicates that the position of the object does not change as time progresses. This means the object is not moving, hence it is at rest.

Question 4

An object is moving with constant non-zero acceleration in the +x direction.The velocity versus time graph of this object is

Accepted Answer

Since the object is moving with constant non-zero acceleration in the +x direction, the velocity versus time graph must be a straight line. However, this straight line cannot be horizontal or vertical because the velocity is changing over time. Therefore, the only option left is a straight line making an angle with the time axis.

Question 5

Suppose a ball is thrown straight up and experiences no appreciable air resistance.What is its acceleration just before it reaches its highest point?

Accepted Answer

The acceleration of the ball is exactly g (9.8 m/s^2 downward) throughout its flight, including just before it reaches its highest point, due to gravity.

Question 6

A ball is thrown downward in the absence of air resistance.After it has been released,which statement(s)concerning its acceleration is correct? (There could be more than one correct choice. )

Accepted Answer

In the absence of air resistance, the only force acting on the ball is gravity, which imparts a constant acceleration equal to g (9.8 m/s^2 on Earth). This means the acceleration does not change over time, making it constant.

Question 7

An object is moving with constant non-zero velocity in the +x direction.The velocity versus time graph of this object is

Accepted Answer

Since the object is moving with constant non-zero velocity in the +x direction, its velocity will be constant and not changing with time. Therefore, the velocity versus time graph will be a horizontal straight line.

Question 8

From the edge of a roof top you toss a green ball upwards with initial speed v₀ and a blue ball downwards with the same initial speed.Air resistance is negligible.When they reach the ground below

Accepted Answer

Gravity causes both the green and blue ball to accelerate downwards at the same rate (assuming no air resistance), which means they will have the same final velocity when they hit the ground. The direction of their velocity will be different, but their magnitude will be the same. Therefore, choice C is the best answer.

Question 9

An object is moving with constant non-zero acceleration in the +x direction.The position versus time graph of this object is

Accepted Answer

Since the object is moving with constant non-zero acceleration in the +x direction, its position versus time graph should be a parabolic curve according to the kinematic equation x = 1/2at^2 + vot + x0, where x is the position, t is time, a is the acceleration, vo is the initial velocity, and x0 is the initial position. The term 1/2at^2 is the quadratic term that results in a parabolic shape.

Question 10

A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance.If it takes the 20-kg rock a time T to reach the ground,what time will it take the 10-kg rock to reach the ground?

Accepted Answer

The acceleration due to gravity is constant for all objects, regardless of their mass. Therefore, both rocks will experience the same acceleration and fall at the same rate. Thus, both rocks will take the same time to reach the ground, which is T.

Question 11

The slope of a velocity versus time graph gives

Accepted Answer

The slope of a velocity versus time graph gives the rate of change of velocity, which is acceleration. Therefore, the correct choice is C, acceleration. Choices A, B, and D are incorrect. The distance traveled can be found by finding the area under the velocity-time graph. The velocity is represented by the slope of the position-time graph. The displacement of an object is represented by the area under the velocity-time graph between two points.

Question 12

A 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance.If the 10-kg rock falls with acceleration a,what is the acceleration of the 20-kg rock?

Accepted Answer

The acceleration of a falling object due to gravity is constant and independent of the mass of the object. Therefore, both rocks will experience the same acceleration, which is denoted by "a". Therefore, the correct answer is (C) a.

Question 13

An object is moving with constant non-zero velocity in the +x direction.The position versus time graph of this object is

Accepted Answer

A constant non-zero velocity means the object is moving at a steady rate in the +x direction. This results in a position vs. time graph that is a straight line making an angle with the time axis, where the slope of the line represents the velocity.

Question 14

A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance.Which one of the following statements about this rock while it is in the air is correct?

Accepted Answer

The acceleration due to gravity is always downward throughout the motion of the rock, regardless of whether the rock is moving up, at its highest point, or coming down.

Question 15

A 10-kg rock and a 20-kg rock are thrown upward with the same initial speed v₀ and experience no significant air resistance.If the 10-kg rock reaches a maximum height h,what maximum height will the 20-kg ball reach?

Accepted Answer

Since the two rocks are thrown upward with the same initial speed, the only factor that affects their maximum height is their mass. From the conservation of energy, we know that at the maximum height, all of the initial kinetic energy is converted to potential energy. Since the potential energy is proportional to the mass, the 20-kg rock will have twice the potential energy of the 10-kg rock at the same height. Therefore, the maximum height the 20-kg rock can reach is twice that of the 10-kg rock, which is h. Therefore, the best answer choice is (C).

Question 16

Brick A is dropped from the top of a building.Brick B is thrown straight down from the same building,and neither one experiences appreciable air resistance.Which statement about their accelerations is correct?

Accepted Answer

The acceleration of both the bricks will be equal because the acceleration due to gravity is the same for all objects, regardless of their mass or initial velocity. The acceleration due to gravity is approximately 9.8 m/s^2. Therefore, both the bricks will have an acceleration of 9.8 m/s^2 towards the ground.

Question 17

The slope of a position versus time graph gives

Accepted Answer

The slope of a position versus time graph represents the rate of change of position over time, which is equivalent to velocity. Therefore, the answer is B, velocity.

Question 18

Ball A is dropped from the top of a building.One second later,ball B is dropped from the same building.Neglect air resistance.As time progresses,the difference in their speeds

Accepted Answer

Since both balls are being dropped from the same height and neglecting air resistance, they will experience the same acceleration due to gravity of 9.8 m/s^2. Therefore, their speeds will increase at the same rate and remain constant relative to each other, meaning the difference in their speeds will remain constant as well.

Question 19

A ball is thrown straight up,reaches a maximum height,then falls to its initial height.Which of the following statements about the direction of the velocity and acceleration of the ball as it is going up is correct?

Accepted Answer

When the ball is going up, its velocity is initially positive (upward) and decreases until it reaches zero velocity at the maximum height. At the same time, the acceleration of the ball is directed downward due to the force of gravity. Therefore, the correct statement is that the velocity of the ball points upward while its acceleration points downward.

Question 20

When a ball is thrown straight up with no air resistance,the acceleration at its highest point

Accepted Answer

The acceleration due to gravity is always directed downward, regardless of the object's motion. At the highest point, the velocity of the ball is zero, but the acceleration remains directed downward at approximately 9.8 m/s^2.

Quiz 2: One-Dimensional Kinematics

Two objects are dropped from a bridge,an interval of 1.0 s apart.Air resistance is negligible.During the time that both objects continue to fall,their separation

Two objects are thrown from the top of a tall building.One is thrown up,and the other is thrown down,both with the same initial speed.What are their speeds when they hit the street? Neglect air resistance.

If the position versus time graph of an object is a horizontal line,the object is

An object is moving with constant non-zero acceleration in the +x direction.The velocity versus time graph of this object is

Suppose a ball is thrown straight up and experiences no appreciable air resistance.What is its acceleration just before it reaches its highest point?

A ball is thrown downward in the absence of air resistance.After it has been released,which statement(s) concerning its acceleration is correct? (There could be more than one correct choice. )

An object is moving with constant non-zero velocity in the +x direction.The velocity versus time graph of this object is

From the edge of a roof top you toss a green ball upwards with initial speed v₀ and a blue ball downwards with the same initial speed.Air resistance is negligible.When they reach the ground below

An object is moving with constant non-zero acceleration in the +x direction.The position versus time graph of this object is

A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance.If it takes the 20-kg rock a time T to reach the ground,what time will it take the 10-kg rock to reach the ground?

The slope of a velocity versus time graph gives

A 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance.If the 10-kg rock falls with acceleration a,what is the acceleration of the 20-kg rock?

An object is moving with constant non-zero velocity in the +x direction.The position versus time graph of this object is

A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance.Which one of the following statements about this rock while it is in the air is correct?

A 10-kg rock and a 20-kg rock are thrown upward with the same initial speed v₀ and experience no significant air resistance.If the 10-kg rock reaches a maximum height h,what maximum height will the 20-kg ball reach?

Brick A is dropped from the top of a building.Brick B is thrown straight down from the same building,and neither one experiences appreciable air resistance.Which statement about their accelerations is correct?

The slope of a position versus time graph gives

Ball A is dropped from the top of a building.One second later,ball B is dropped from the same building.Neglect air resistance.As time progresses,the difference in their speeds

A ball is thrown straight up,reaches a maximum height,then falls to its initial height.Which of the following statements about the direction of the velocity and acceleration of the ball as it is going up is correct?

When a ball is thrown straight up with no air resistance,the acceleration at its highest point

Quiz 2: One-Dimensional Kinematics

Two objects are dropped from a bridge,an interval of 1.0 s apart.Air resistance is negligible.During the time that both objects continue to fall,their separation

Two objects are thrown from the top of a tall building.One is thrown up,and the other is thrown down,both with the same initial speed.What are their speeds when they hit the street? Neglect air resistance.

If the position versus time graph of an object is a horizontal line,the object is

An object is moving with constant non-zero acceleration in the +x direction.The velocity versus time graph of this object is

Suppose a ball is thrown straight up and experiences no appreciable air resistance.What is its acceleration just before it reaches its highest point?

A ball is thrown downward in the absence of air resistance.After it has been released,which statement(s) concerning its acceleration is correct? (There could be more than one correct choice. )

An object is moving with constant non-zero velocity in the +x direction.The velocity versus time graph of this object is

From the edge of a roof top you toss a green ball upwards with initial speed v0 and a blue ball downwards with the same initial speed.Air resistance is negligible.When they reach the ground below

An object is moving with constant non-zero acceleration in the +x direction.The position versus time graph of this object is

A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance.If it takes the 20-kg rock a time T to reach the ground,what time will it take the 10-kg rock to reach the ground?

The slope of a velocity versus time graph gives

A 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance.If the 10-kg rock falls with acceleration a,what is the acceleration of the 20-kg rock?

An object is moving with constant non-zero velocity in the +x direction.The position versus time graph of this object is

A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance.Which one of the following statements about this rock while it is in the air is correct?

A 10-kg rock and a 20-kg rock are thrown upward with the same initial speed v0 and experience no significant air resistance.If the 10-kg rock reaches a maximum height h,what maximum height will the 20-kg ball reach?

Brick A is dropped from the top of a building.Brick B is thrown straight down from the same building,and neither one experiences appreciable air resistance.Which statement about their accelerations is correct?

The slope of a position versus time graph gives

Ball A is dropped from the top of a building.One second later,ball B is dropped from the same building.Neglect air resistance.As time progresses,the difference in their speeds

A ball is thrown straight up,reaches a maximum height,then falls to its initial height.Which of the following statements about the direction of the velocity and acceleration of the ball as it is going up is correct?

When a ball is thrown straight up with no air resistance,the acceleration at its highest point

From the edge of a roof top you toss a green ball upwards with initial speed v₀ and a blue ball downwards with the same initial speed.Air resistance is negligible.When they reach the ground below

A 10-kg rock and a 20-kg rock are thrown upward with the same initial speed v₀ and experience no significant air resistance.If the 10-kg rock reaches a maximum height h,what maximum height will the 20-kg ball reach?