Conservation of Energy and Intro to Energy and Work

Multiple Choice

In physics, what does the term 'conservation' mean?

• Using less of something

• Transferring something without creating or destroying it

• Saving money

• Increasing energy

Open Ended

Why is the conservation of energy important in our daily lives and in physics?

Multiple Choice

According to the law of conservation of energy, what happens to energy when it is transferred from one object or system to another?

• It is created.

• It is destroyed.

• It is converted from one type to another or transferred without being created or destroyed.

• It disappears.

Multiple Select

Which of the following are forms of energy described in the slides?

• Kinetic energy

• Potential energy

• Internal energy

• Thermal energy

Open Ended

Describe how energy changes form and is transferred in the example involving the Sun, solar panel, and electric motor.

Multiple Choice

Work is the transfer of energy from one object or system to another through a ___ process that happens when a force is exerted.

• mechanical

• chemical

• thermal

• electrical

Open Ended

What is the relationship between kinetic energy and potential energy as shown in the ball and spring example?

Multiple Choice

What condition must be met for work to be done on an object or system according to the definition of energy transfer through a mechanical process?

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

• Energy must be transferred through heat only.

• The direction of force must be the same as the direction of motion.

• The object must be stationary.

Open Ended

Compare the scenarios in which energy is transferred from object A to B and when no energy is transferred. What is the key difference in terms of the force and motion?

Multiple Select

Which of the following statements are true about the work done by a force F on an object?

• Work is done only if force and displacement are in the same direction.

• No work is done if force is perpendicular to displacement.

• Work is always done regardless of the direction of force.

• Work is done only if there is displacement in the direction of force.

Open Ended

Explain how the angle between force and displacement affects the amount of 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 does not because it is perpendicular to displacement.

• Both components do work because force is applied.

• The horizontal component does work; the vertical does not because it is perpendicular to displacement.

• Neither component does work if the force is at an angle.

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 zero work done by the force?

• 0°

• 30°

• 90°

• 180°

Open Ended

A force of 8 N acts at an angle of 30° to the direction of displacement of 10 m. Calculate the work done by the force.

Multiple Select

Select all the correct statements about the calculation of work from the images:

• Work is calculated as the product of force, displacement, and the cosine of the angle between them.

• The unit of work is the newton-meter (Nm).

• Work is always positive.

• Work can be zero if the force is perpendicular to displacement.

Multiple Choice

Which of the following statements is correct regarding the calculation of work done by a force of 8 N over a displacement of 10 m at different angles?

• Work is always positive regardless of the angle.

• Work is maximum when the force is perpendicular to displacement.

• Work is zero when the force is perpendicular to displacement.

• Work is negative when the force is in the same direction as displacement.

Multiple Choice

Which force(s) in the first scenario (slide 1) do zero work on the object?

• F_x and F_k

• F_g and F_n

• F_x and F_g

• F_k and F_n

Open Ended

Consider the examples in slides 1–3. How does the direction of force relative to displacement affect the work done by each force?

Open Ended

How does the calculation of total work done change when the applied force is at an angle, as shown in slides 2 and 3?

Multiple Choice

Which of the following statements is true about kinetic energy, based on slide 5?

• 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

What is the relationship between the net work done on an object and its kinetic energy, as shown in slide 6?

• The net work done is always greater than the change in kinetic energy.

• The net work done equals the change in kinetic energy.

• The net work done is always less than the change in kinetic energy.

• There is no relationship between net work and kinetic energy.

Open Ended

What questions do you still have about the conservation of energy or its applications in real life?

Open Ended

How does the definition of 'conservation' in everyday life differ from its meaning in physics?