Work Review

How do you know when a force has been applied to an object?

• It moves.
• It stays in place.

• It gets bigger.

A force exerted over a distance to move an object is ______________________.

• power
• work
• momentum
• Watt

Work is done when which two things happen?

• an object is moved

• power is converted into Newtons

• an object has been subjected to force (unbalanced)

• an object stays in place

How much work is being done with 200 N of force over 426 meters?

• 85,200 J
• 45,620 J
• 90,480 J
• 62,329 J

If 17 Newtons were necessary to move a crate 4 meters, how much work was done?

• 272 N

• 68 Joules

• 68 N

• 272 J 

F = ma ; W = Fd

If a 3 Kg object is moved 10 meters at a rate of 5 m/s/s, how much work was done?

• 1500 J

• 150 J

• 1.5 J

• 150 N

A family needs 10 Newtons of force to lift a box to the top of a 2 meter shelf. How much work do they do?

• 12 J

• 8 J

• 20 J

• 5 J

F = ma ; W = Fd

A worker with a mass of 50 Kg climbs a 2 meter ladder at a rate of 0.8 m/s². How much work was done?

• 100 J

• 80 J

• 52.8 J

• 125 J

Fred hits a bludger with a force of 20N to George, who is 5 meters away. How much work was done?

• 25J
• 100J
• 4J
• 75J

F = ma W = Fd

A man reels in what he thinks is a fish. He estimates it has a mass of 3 Kg. He starts reeling at a rate of 5 m/s². He thinks his line is out 7 meters. How much work did he do?

• 105 N

• 525J

• 105 J

• 525 N