Question 1

The scientist to first introduce the concept of inertia was&#10;A)Aristotle.&#10;B)Galileo.&#10;C)Newton.&#10;D)Copernicus.

Accepted Answer

Galileo was the first to introduce the concept of inertia in his work on motion and was the first to understand that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. Although Aristotle had some understanding of motion, he did not introduce the concept of inertia. Newton built on Galileo's work and developed the laws of motion. Copernicus is known for his work on heliocentrism, which revolutionized astronomy, but not for introducing the concept of inertia.

Question 2

Hang from a pair of gym rings and the upward support forces of the rings will always&#10;A)each be half your weight.&#10;B)each equal your weight.&#10;C)add up to equal your weight.

Accepted Answer

The upward support forces from the rings must add up to equal your weight to balance the downward force of gravity acting on you.

Question 3

A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales.The reading on each scale is&#10;A)200 N.&#10;B)400 N.&#10;C)800 N.&#10;D)none of these

Accepted Answer

When the man stands on two scales, his weight is distributed evenly between them. Therefore each scale will show half of his weight. So the reading on each scale will be 400 N.

Question 4

If no external forces are acting on a moving object,it will&#10;A)continue moving at the same speed.&#10;B)continue moving at the same velocity.&#10;C)move slower and slower until it finally stops.

Accepted Answer

According to Newton's first law of motion, an object in motion will continue moving at the same velocity unless acted upon by an external force.

Question 5

When you stand at rest on a pair of bathroom scales,the readings on the scales will always&#10;A)each be half your weight.&#10;B)each equal your weight.&#10;C)add up to equal your weight.

Accepted Answer

When standing on two scales, your weight is distributed between them, so the sum of the readings on both scales will equal your total weight.

Question 6

If your automobile runs out of fuel while you are driving,the engine stops but you do not come to an abrupt stop.The concept that most explains why is&#10;A)inertia.&#10;B)gravity.&#10;C)acceleration.&#10;D)resistance.

Accepted Answer

Inertia is the tendency of an object to resist any change in its state of rest or motion. In this case, even though the engine has stopped due to lack of fuel, the car still has a certain amount of motion due to inertia, which allows it to keep moving for some distance.

Question 7

According to Newton's law of inertia,a railroad train in motion should continue going forever even if its engine is turned off.We never observe this because railroad trains&#10;A)move too slowly.&#10;B)are much too heavy.&#10;C)must go up and down hills.&#10;D)always have forces that oppose their motion.

Accepted Answer

Newton's law of inertia states that an object in motion will stay in motion with a constant velocity unless acted upon by an external force. In the case of a railroad train, there are always opposing forces that act upon it such as friction, air resistance, and gravity. These forces eventually bring the train to a stop, rather than allowing it to continue moving forever.

Question 8

Whirl a rock at the end of a string and it follows a circular path.If the string breaks,the tendency of the rock is to&#10;A)continue to follow a circular path.&#10;B)follow a straight-line path.&#10;C)increase its speed.&#10;D)revolve in a smaller circle.

Accepted Answer

If the string breaks, the rock would no longer be attached to a centripetal force that keeps it moving in a circular path. Therefore, the rock would continue to move in a straight line path due to its inertia.

Question 9

A package falls off a truck that is moving at 30 m/s.Neglecting air resistance,the horizontal speed of the package just before it hits the ground is&#10;A)zero.&#10;B)less than 30 m/s but larger than zero.&#10;C)about 30 m/s.&#10;D)more than 30 m/s.&#10;E)More information is needed for an estimate.

Accepted Answer

The horizontal speed of the package remains constant at 30 m/s because there is no horizontal force acting on it (neglecting air resistance).

Question 10

The force of friction on a sliding object is 10 N.The applied force needed to maintain a constant velocity is&#10;A)more than 10 N.&#10;B)less than 10 N.&#10;C)10 N.

Accepted Answer

According to Newton's first law of motion, an object at rest or in uniform motion will remain so unless acted upon by an external force. In this scenario, the object is already in motion and is experiencing a frictional force of 10 N in the opposite direction of its motion. To maintain a constant velocity, an applied force equal to the force of friction (10 N) in the direction of motion is needed. Therefore, the applied force needed is also 10 N, which is option C.

Question 11

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly.This best demonstrates that&#10;A)the milk carton has no acceleration.&#10;B)there is an action-reaction pair of forces.&#10;C)gravity tends to hold the milk carton secure.&#10;D)the milk carton has inertia.&#10;E)none of these

Accepted Answer

The answer of A sheet of paper can be withdrawn...

Question 12

A 300-kg bear grasping a vertical tree slides down at constant velocity.The friction force between the tree and the bear is&#10;A)30 N.&#10;B)300 N.&#10;C)3000 N.&#10;D)more than 3000 N.

Accepted Answer

The answer of A 300-kg bear grasping a vertical tree...

Question 13

Whereas Aristotle relied on logic in explaining nature,Galileo relied on&#10;A)logic also.&#10;B)patterns.&#10;C)experiment.&#10;D)mathematics.

Accepted Answer

The answer of Whereas Aristotle relied on logic in explaining...

Question 14

When a rocket ship accelerating in outer space runs out of fuel,it&#10;A)accelerates for a short time,then slows down to a constant velocity.&#10;B)accelerates for a short time,slows down,and eventually stops.&#10;C)no longer accelerates.

Accepted Answer

The answer of When a rocket ship accelerating in outer...

Question 15

An object in mechanical equilibrium is an object&#10;A)at rest.&#10;B)moving with constant velocity.&#10;C)having no acceleration.&#10;D)all of these

Accepted Answer

The answer of An object in mechanical equilibrium is an...

Question 16

Galileo's use of inclined planes allowed him to effectively&#10;A)slow down the acceleration of free fall.&#10;B)increase the acceleration beyond that of free fall.&#10;C)eliminate the acceleration of free fall.&#10;D)eliminate friction.

Accepted Answer

The answer of Galileo's use of inclined planes allowed him...

Question 17

A truck is moving at constant velocity.Inside the storage compartment,a rock is dropped from the midpoint of the ceiling and strikes the floor below.The rock hits the floor&#10;A)exactly below the midpoint of the ceiling.&#10;B)ahead of the midpoint of the ceiling.&#10;C)behind the midpoint of the ceiling.&#10;D)More information is needed to solve this problem.&#10;E)none of these

Accepted Answer

The answer of A truck is moving at constant velocity.Inside...

Question 18

Galileo's interpretation of motion differed from Aristotle's in that Galileo emphasized&#10;A)the acceleration of free fall.&#10;B)time rates.&#10;C)the role of distance in describing motion.&#10;D)all of these&#10;E)none of these

Accepted Answer

The answer of Galileo's interpretation of motion differed from Aristotle's...

Deck 2: Newtons First Law of Motion: Inertia