Question 1

If a small sports car collides head-on with a massive truck, which vehicle experiences the greater impact force? Which vehicle experiences the greater acceleration due to the impact?

Accepted Answer

The answer of If a small sports car collides head-on...

Question 2

The modulus of elasticity is a measure of how easily a material will stretch when pulled (subject to a tensile force) or how well the material will shorten when pushed (subject to a compressive force).

Accepted Answer

The modulus of elasticity, also known as Young's modulus, is a measure of a material's stiffness or resistance to elastic deformation under stress. It describes the relationship between stress (force per unit area) and strain (change in length per unit length) in a material subjected to tensile or compressive forces. The higher the modulus of elasticity, the stiffer the material, and the less it will stretch or compress under a given force.

Question 3

Pressure is a fundamental dimension.

Accepted Answer

Pressure is not a fundamental dimension; it is derived from the fundamental dimensions of mass, length, and time.

Question 4

A "teeter-totter" (or "see-saw" if you prefer) has a 22.68 kg child sitting at one end, 3.05 m from the center pivot point (fulcrum).How far from the center point should a 56.70 kg adult sit in order to balance the teeter-totter?
A)0.76 m
B)1.22 m
C)1.98 m
D)3.05 m

Accepted Answer

To balance the teeter-totter, the moments on either side of the fulcrum must be equal. The moment is calculated as the product of mass and distance from the fulcrum. Therefore, 22.68 kg * 3.05 m = 56.70 kg * distance. Solving for distance gives 1.22 m.

Question 5

A tow truck exerts a force of  on a car, causing it to accelerate at  .What is the mass of the car?
A)45 slugs
B)45 lbm
C)45 kg
D)None of the above

Accepted Answer

The answer of A tow truck exerts a force of...

Question 6

A ductile material shows little or no permanent deformation before it ruptures.

Accepted Answer

A ductile material is one that can undergo significant permanent deformation before rupture.

Question 7

Calculate the torque produced by a 50 N perpendicular force at the end of a 20 cm-long wrench.
A)10 N.m
B)1000 N.m
C)2.5 N/m
D)0.4 cm/N

Accepted Answer

Torque = Force x Distance 
The perpendicular distance from the force to the pivot point (i.e. the end of the wrench) is 20 cm. Therefore, 
Torque = 50 N x 20 cm = 1000 N.cm = 10 N.m. 
So the answer is choice A, 10 N.m.

Question 8

A "suction cup" sticks to the wall because it is
A)pulled to the wall by vacuum
B)pushed to the wall by the atmospheric pressure
C)both of these
D)none of the above

Accepted Answer

The answer of A "suction cup" sticks to the wall...

Question 9

What is the SI unit for pressure?
A) 
B) 
C) 
D)

Accepted Answer

The answer of What is the SI unit for pressure?
A)...

Question 10

Geometric properties of an object such as its length, area, and first and second moment of area do not play significant roles in the way the object responds to a force.

Accepted Answer

Geometric properties such as length, area, and moment of area are essential in determining an object's response to external forces. For example, the moment of area affects an object's resistance to bending, while the area and length determine its resistance to tension and compression. Therefore, geometric properties are significant factors in how an object responds to a force.

Question 11

The absolute pressure is related to the gauge pressure according to

Accepted Answer

Absolute pressure is equal to the sum of gauge pressure and atmospheric pressure.

Question 12

The modulus of elasticity, or Young's modulus, is computed by calculating the slope of a stress-strain diagram over the elastic region.

Accepted Answer

This is the definition of the modulus of elasticity or Young's modulus.

Question 13

Identify the force that accelerates a car:
A)the car pushing on the road
B)the road pushing on the car
C)the engine pushing on the wheels
D)the wheels pushing on the engine

Accepted Answer

The force that accelerates a car is the road pushing on the car. This is due to Newton's third law of motion, where the wheels push back on the road, and the road pushes forward on the car, providing the necessary force for acceleration.

Question 14

Stress provides a measure of the intensity of internal forces acting over an area.

Accepted Answer

This is an accurate definition of stress, which is commonly used in physics and engineering.

Question 15

The value of fluid bulk modulus shows how easily the volume of the fluid can be reduced when the pressure acting on it is increased.

Accepted Answer

This is because bulk modulus is defined as the ratio of compressive stress to volumetric strain, so a higher bulk modulus indicates that the fluid is less compressible and will experience less volume reduction for a given increase in pressure.

Question 16

What does g stand for in the following equation? 
A)Weight
B)Gallons
C)Acceleration due to gravity
D)none of the above

Accepted Answer

The equation given is not specific enough to determine what g represents, but in many scientific or mathematical formulas, g represents the acceleration due to gravity. Therefore, C is the best choice.

Question 17

The modulus of rigidity is a measure of how easily a material can be twisted or sheared.

Accepted Answer

The modulus of rigidity, also known as shear modulus, is a measure of a material's resistance to deformation under shear stress, which is a type of stress that occurs when forces are applied parallel to each other but in opposite directions. Therefore, it is a measure of how easily a material can be twisted or sheared.

Question 18

Linear impulse represents the net effect of a force acting over a period of time and brings about a change in the linear momentum of the object.

Accepted Answer

Linear impulse is defined as the net effect of a force acting over a period of time and results in a change in the linear momentum of the object.

Question 19

A tow truck exerts a force of  on a car, causing it to accelerate at  .What is the mass of the car?
A) 
B) 
C) 
D) 
E)None of the above

Accepted Answer

The answer of A tow truck exerts a force of...

Question 20

A brittle material, when subjected to a tensile load, will go through significant permanent deformation before it breaks.

Accepted Answer

A brittle material will undergo minimal plastic deformation before fracturing under a tensile load.

Quiz 10: Force and Force-Related Variables in Engineering

If a small sports car collides head-on with a massive truck, which vehicle experiences the greater impact force? Which vehicle experiences the greater acceleration due to the impact?

The modulus of elasticity is a measure of how easily a material will stretch when pulled (subject to a tensile force) or how well the material will shorten when pushed (subject to a compressive force).

Pressure is a fundamental dimension.

A "teeter-totter" (or "see-saw" if you prefer) has a 22.68 kg child sitting at one end, 3.05 m from the center pivot point (fulcrum) .How far from the center point should a 56.70 kg adult sit in order to balance the teeter-totter?

A tow truck exerts a force of on a car, causing it to accelerate at .What is the mass of the car?

A ductile material shows little or no permanent deformation before it ruptures.

Calculate the torque produced by a 50 N perpendicular force at the end of a 20 cm-long wrench.

A "suction cup" sticks to the wall because it is

What is the SI unit for pressure?