Module 10 Lesson_1_Work_and_Energy

Multiple Choice

What is the law of conservation of momentum?

• It states that the momentum of any closed, isolated system does not change.

• It states that energy cannot be created or destroyed.

• It states that force equals mass times acceleration.

• It states that the velocity of an object remains constant unless acted upon by a force.

Multiple Choice

Which equation represents the work done when a net force is exerted on an object and the object moves a certain distance?

• Fd = 1/2 mv_f^2

  - 1/2 mv_i^2

• W = Fd cos θ

• W = Fd

• F = ma

Multiple Choice

Which of the following statements about work is correct?

• Work is done only when a force causes displacement in the direction of the force.

• Work is always done when a force is applied, regardless of displacement.

• Work is done only if the force is perpendicular to the displacement.

• Work is done only if the force is opposite to the displacement.

Open Ended

Describe the relationship between force, displacement, and the angle between them in determining the amount of work done on a system.

Multiple Choice

What does the area under a force versus displacement graph represent?

• The work done by the force

• The velocity of the object

• The acceleration of the object

• The mass of the object

Multiple Select

Which of the following are steps in solving work-related problems, according to the strategies given? (Select 3)

• Identify and sketch the system

• Find the angle between force and displacement

• Calculate the work done by each force

• Ignore the direction of displacement

Multiple Choice

If the external world does work on a system, what happens to the system's energy?

• It increases

• It decreases

• It stays the same

• It becomes zero

Multiple Choice

In the example of pushing a box, what is the value of the angle θ between the force and the displacement?

• 10.0°

• 0°

• 90°

• 45°

Multiple Choice

Which of the following best describes kinetic energy?

• The energy associated with motion, represented by KE.

• The energy stored in chemical bonds.

• The energy due to an object's position relative to Earth.

• The energy released during nuclear reactions.

Multiple Select

Based on the bar graphs for throwing and catching a ball, which of the following statements are correct? (Select all the apply.)

• Throwing a ball involves positive work, increasing kinetic energy.

• Catching a ball involves negative work, decreasing kinetic energy.

• The direction of force determines whether work is positive or negative.

• The bar graph height represents the amount of work or energy in joules.

Multiple Choice

A net force of 2800 N accelerates a 1250-kg vehicle for 8.0 s over a distance of 80.0 m. What is the power output?

• 28 kW

• 22 kW

• 35 kW

• 10 kW