Power is work done over _____

Some of the energy put into a machine is changed into heat because of _____

A machine that only changes the direction of a force has a mechanical advantage of _____

The measure of how much work put into a machine is changed into useful work put out by the machine is _____

In a first class lever

How much power does a person weighing 500N need to climb a 3 m ladder in 5 s?

Using a ramp 6 m long, workers apply an effort force of 1,250 N to move a 2,00 N crate onto a platform 2 m high. What is the efficiency of the ramp?

Which of these cannot be done by a machine?

In an ideal machine which of the following is true?

An adult and a child are on a seesaw, when the fulcrum is in the middle the child can not move the adult. How should the fulcrum be moved so the two can seesaw?

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