What two things must happen for work to be done?

What does a fixed pulley change?

If a barbell weighs 160 N, what other information do you need to calculate how much work it takes to lift it?

Which of the following is the comparison of a machine's work output with the work input?

What is the work done by a machine on an object?

What is it called when a force causes an object to move in the direction of the force?

How does a ramp make lifting a heavy object easier?

A doorknob is an example of a

What is a device that makes work easier by changing the size or direction of force?

If an identical stack of books is lifted the same distance and one person does the job twice as fast, which of the following is done twice as much?

Chris and Jane are lifting boxes to put them on shelves. Chris does 200 J of work in 5 minutes and Jane does 200 J of work in 4 minutes. What is the difference between the two jobs?

Which of the following is NOT a wedge?

What is a machine with a grooved wheel that holds a cable?

A construction worker is lifting a load of bricks onto a truck. He does 200 J of work in 40 seconds. What is his power output?

Which of the following is a compound machine?

Which of the following causes machines not to be 100% efficienct?

Greg applies a force of 100 N to move a box 5 meters. How much work did he do?

What is machine that is made of two simple machines?

What is the work that you do on a machine?

Force times _______________ is the formula to calculate work.

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