[Reviewer] T3 WW2: Work, Power and Energy

Match the following quantites with their correct formula

• W/t

• Total Mechanical Energy

• F · d · cosθ

• Work (W)

• ½ m · v²

• Power (P)

• m · g · h

• Kinetic Energy

• KE + PE

• Gravitational Potential Energy

What is/are the unit/s for work?

• Watt (W)

• Newton (N)

• Joule (J)

• Newton · meter (N·m)

When is work considered to be done on an object?

• When force is applied but the object does not move.

• When force is applied and the object moves in the direction of the force.

• When force is applied in any direction.

• When an object moves without any force.

Which of the following situations shows work being done?

• Holding a book without moving.

• Pushing a car that does not move.

• Lifting a box onto a shelf.

• Standing still while carrying a heavy backpack.

A ball is thrown upwards. What happens to its KE and PE as the ball goes up?

• KE increases and PE decreases

• KE decreases and PE increases

• Both KE and PE increases

• Both KE and PE decreases

Which of the following examples illustrates NO WORK being done? Select all correct answers.

• A person lifting a weight above their head.

• A person climbing stairs with a backpack.

• A person pushing a wall without moving it.

• A person walking while holding a suitcase.

In which scenario is work done against gravity?

• Sliding a book across a table.

• Standing still with a suitcase.

• Carrying a bag horizontally.

• Climbing a ladder with a bucket of water.

Which of the following describes power?

• The rate at which work is done.

• The amount of force applied to an object.

• The amount of energy stored in an object.

• The speed at which an object moves.

Which of these activities requires the most power?

• Lifting a box slowly

• Lifting a box quickly

• Holding a box without moving

• Placing a box gently on the floor

Which of the following increases power output?

• Decreasing work and increasing time

• Increasing work and decreasing time

• Keeping work constant while increasing time

• Doing less work over a longer time