Conservation of Energy and an Intro to Energy and Work - AP

Multiple Choice

Which of the following best describes the physics definition of conservation?

• Using less of something to save resources

• Transferring something from one object or system to another without being created or destroyed

• Switching off lights to save energy

• Choosing to ride a bicycle rather than drive a car

Open Ended

What is the significance of the conservation of energy in our daily lives and in physics?

Multiple Choice

Which statement best describes the law of conservation of energy?

• Energy can be created and destroyed.

• Energy can only be transferred between living things.

• Energy can be transferred or converted but not created or destroyed.

• Energy can only exist in one form.

Multiple Choice

What are the three different forms of energy mentioned in the slides?

• Thermal, sound, and light energy

• Kinetic, potential, and internal energy

• Nuclear, electrical, and chemical energy

• Magnetic, elastic, and gravitational energy

Open Ended

Describe how energy changes form and is transferred in the solar panel and electric motor system shown.

Multiple Select

Which of the following statements about work and energy is/are correct?

• Work is the transfer of energy through a mechanical process.

• Energy cannot be transferred between objects.

• Work happens when a force is exerted along the direction of motion.

• Energy is only present in moving objects.

Open Ended

Explain how kinetic energy can be transformed into potential energy using the example of a ball and a spring.

Multiple Choice

According to the slides, what must be true for work to be done on an object or system by a force?

• The force must be perpendicular to the direction of motion.

• The force must be in the same direction as the motion of the object or system.

• The object or system must be stationary.

• The force must be greater than the weight of the object.

Multiple Choice

If a force is applied perpendicular to the displacement of an object, what is the work done by the force?

• It is equal to the product of force and displacement.

• It is equal to the product of force, displacement, and cosine of the angle between them.

• It is zero.

• It is equal to the force only.

Multiple Choice

Which of the following scenarios results in positive work being done?

• A force is applied in the same direction as the displacement.

• A force is applied perpendicular to the displacement.

• No force is applied to the object.

• A force is applied in the opposite direction to the displacement.

Open Ended

Explain how the angle between the force and displacement affects the work done on an object.

Multiple Choice

Which component of the applied force does work on the box, and why does the other component do no work?

• The vertical component does work; the horizontal component does not.

• Both components do work equally.

• The horizontal component does work; the vertical component does not.

• Neither component does work.

Open Ended

Explain how the direction of force relative to displacement affects the sign (positive, negative, or zero) of the work done, using examples from the diagrams.

Multiple Choice

Which of the following angles between force and displacement results in negative work done by the force?

• 0°

• 30°

• 150°

• 90°

Open Ended

A force of 1 N moves an object 1 m in the same direction as the force. Calculate the work done and state its unit.

Multiple Choice

Which of the following correctly represents the calculation for the work done when a force of 8 N acts at 30° to the direction of a 10 m displacement?

• W = (8 N)(10 m)cos0° = 80 J

• W = (8 N)(10 m)cos30° = 69.3 J

• W = (8 N)(10 m)cos90° = 0 J

• W = (8 N)(10 m)cos180° = -80 J

Multiple Select

Select all the scenarios where the work done by the force is zero.

• Force is perpendicular to displacement

• Force is in the same direction as displacement

• Force is opposite to displacement

• Force is at 90° to displacement

Multiple Choice

Which forces contribute to the total work done on the object in the direction of displacement in the first scenario?

• F_x and F_k

• F_x and F_g

• F_x and F

• F_k and F_g

Multiple Choice

How does the calculation of total work done change when the applied force is at an angle, as shown in the second scenario?

• The total work done increases because the force is larger.

• The total work done decreases because the force is at an angle.

• The total work done remains the same as long as the net force in the direction of displacement is unchanged.

• The total work done becomes zero.

Open Ended

Explain how Newton's third law applies to the work done by two objects in contact, as shown in the fourth image.

Multiple Choice

Which of the following statements best describes the relationship between motion and kinetic energy?

• All objects have kinetic energy.

• Only stationary objects have kinetic energy.

• Only moving objects have kinetic energy.

• Kinetic energy does not depend on motion.

Multiple Choice

According to the work-energy theorem, what happens to an object's kinetic energy when a net external force does work on it?

• It stays the same.

• It decreases.

• It increases.

• It becomes zero.

Open Ended

Explain the difference between the everyday use of the word 'conservation' and its meaning in physics. Why is this distinction important when discussing energy?