Ch. 5 Review

In which of the following is work NOT used in the scientific sense of the work.

• Jonah did work lifting the weight above his head

• The motor did work moving the car forward

• Physics assignments are a lot of work

• It took a lot of work to pull the other team across the halfway mark

In which of the following situations is work NOT done?

• A student holds a weight for as long as he cans before his muscles fail.

• An elevator lifts a group of people to the 4th floor.

• A car slows down until it comes to a stop

• A student does a push up.

In which of the following situations is there NO net work done?

• A boy on a skateboard picks up speed going down a hill

• A car travels at a constant speed down the interstate

• A girl yanks her backpack out of the locker

• A ball rolls until it comes to a stop

What form of mechanical energy has to do with the motion of an object?

• gravitational potential energy

• kinetic energy

• elastic potential energy

• thermal energy

Which form of mechanical energy has to do with energy stored in height?

• gravitational potential energy

• kinetic energy

• elastic potential energy

• thermal energy

Which form of mechanical energy has to do with energy stored in an object that has been stretched or squashed?

• gravitational potential energy

• kinetic energy

• elastic potential energy

• thermal energy

What do you get when you add all of your kinetic energy to all of your potential energy?

• thermal energy

• mechanical energy

• total energy

• universal energy

Kinetic energy is converted to thermal energy most broadly by

• gravity

• motors

• friction

• movement

An object has a mass of 2.00 kg and a velocity of 2.00 m/s^2.  What is the kinetic energy of the object?

• 1.00 J

• 2.00 J

• 4.00 J

• 8.00 J

A 2.00 kg ball is 2.00 m off of the ground. Which of the following is closest to the potential energy of the ball?

• 4.00 J

• 20.0 J

• 40.0 J

• 400 J