Simple Machines, Part 1: Question Preview (ID: 21050)


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What is the work done by a simple machines on an object?
a) power b) work input c) work output d) lever
What is the work that you do on a simple machine?
a) power b) work input c) work output d) pulley
Which of the following causes work output to be less than work input?
a) friction b) input force c) output force d) power
If a barbell weighs 160 N, what other information do you need to have to calculate how much work it takes to lift it?
a) the shape of the weight b) the distance the barbell is being lifted c) the strenght of the person doing the lifting d) the amout of output force
What two things much happen for work to be done?
a) The object must move and there must be an output force. b) The object must move in the oppostive direction of the force. c) The object must move in the same direction as the force. d) The object must move and the mechanical advantage must be greater than 1.
When a simple machine allows you to apply a small input force, what happens to the distance that you apply this force?
a) it must increase b) it must decrease c) it must stay the same d) it must double
True or false? When you use a simple machine, you do less work.
a) True. Simple machines allow you to do less work. b) True. Simple machines allow some of the work to disappear. c) False. Simple machines make work easier by creating a trade-off between force and distance. d) False. Simple machines cause you to do more work.
What is the device that makes work easier by changing the size and/or direction of the force?
a) power b) watt c) simple machine d) force
What is the number of times a simple machine multiplies force?
a) power b) output force c) mechanical advantage d) mechanical efficiency
In which situation is a person doing work on an object?
a) A student walks while wearing a backpack that weighs 5N. b) A bodybuilder lifts a dumbell weighing 20N. c) A woman exerts 350N of force on a rope attached to a car that does not move. d) A teacher holds a book 1 m off the floor.
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