Nevis' work & energy examples without answers

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Work and Energy Practice Questions :

Example
 Is Work Done
 Explanation
1. A lever lifts a box to a vertical height of 10 m.
 YES
 The level is lifting the mass through a vertical distance in the same direction as the force that it applies.
2. A crane is holding a 200kg steel beam over the building.

3. A ball rolls down a hill.




Example
 Type of Energy Change
 Work Completed by....
1. A paintball is shot from a paintball gun.
 Potential to Kinetic Energy
 The paintball gun.
2. A hitter completes a home run! YAY! and slides to his last base.

3. A person brings out the garbage and then turns around to go back into their house.




Example
 Force (N)
 Work (J)
1. A 2kg chocolate is lifted from the suitcase to a table 1m away from the floor.
 F=mg
 w=Fd
2. A crane is lifts a 200kg steel beam over the building that is 44m high.
 F=mg
 w=Fd
3. Ms.Keyworth lifts her 20lbs cat and puts her cat into the cage 1m above the floor.
(REMEMBER to convert mass into appropriate units)
 F=mg
 w=Fd
Work .png
Work .png
energy .png
energy .png