Unit 5, Review 1_H. Physics_F22

Work causes a change in____.

• Sweat

• Energy

• Calories

• Force

Power is a _______ dependent quantity.

• Outlet

• Energy source

• Time

• Volume

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

• 15 J
• 45 J
• 0 J
• 5 J

Answer explanation

The reason no work is done is because the object has no change in energy. Another clue given to you in this problem is that it is being held. As a result, no change in displacement is being done.

Which situation is work not done?

• lifting a 20 pound box off the floor
• holding a 20 pound box above the floor
• sliding a 20 pound box across the floor
• sliding a 20 pound box up an inclined plane

Energy from a compressed spring would be an example of...

• kinetic energy

• elastic potential

• gravitational potential

• chemical energy

Kinetic energy is associated with the ____ of the object.

• speed/velocity

• position/height

• direction of motion

• temperature

Where does the pendulum have the least amount of potential energy?

• A

• B

• C

• D

• E

Where does the pendulum have the least amount of kinetic energy?

• A

• B

• C

• D

• E

Where is kinetic energy at its maximum?

• a

• b

• c

• d

A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is(g = 10 m/s²)

• (a) 500 J

• (b) 50 J

• (c) 5 J

• (d) 5000 J