Work And Simple Machines Test (II) Question Preview (ID: 24299)


Unit 8 Review For 8th Grade. TEACHERS: click here for quick copy question ID numbers.

Which of the following is a compound machine?
a) lever
b) block and tackle pulley
c) wheel and axle
d) screw

Which of the following causes machines not to be 100% efficienct?
a) friction
b) input force
c) output force
d) power

Greg applies a force of 100 N to move a box 5 meters. How much work did he do?
a) 100 J
b) 500 J
c) 5 J
d) 500 N

Which of the following is NOT a wedge?
a) knife
b) plow
c) chisel
d) ramp

What is a machine with a grooved wheel that holds a cable?
a) lever
b) pulley
c) wheel and axle
d) wedge

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?
a) 50 J
b) 5 J
c) 50 W
d) 5 W

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?
a) the input force
b) the output force
c) the work
d) the power

What is a device that makes work easier by changing the size or direction of force?
a) power
b) watt
c) machine
d) 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?
a) work input
b) work output
c) power
d) efficiency

A doorknob is an example of a
a) pulley
b) wheel and axle
c) lever
d) screw

How does a ramp make lifting a heavy object easier?
a) The object is moved over a shorter distance
b) The ramp increases the amount of work you do
c) Less force is needed to move the object over a longer distance
d) More force is needed to move the object over a longer distance

What is the work done by a machine on an object?
a) power
b) work input
c) work output
d) lever

What is it called when a force causes an object to move in the direction of the force?
a) energy
b) force
c) work
d) power

Which of the following is the comparison of a machine's work output with the work input?
a) mechanical efficiency
b) force
c) mechanical advantage
d) power

If a barbell weighs 160 N, what other information do you need to calculate how much work it takes to lift it?
a) the shape of the weights
b) how high the barbell is being lifted
c) the strength of the person doing the lifting
d) the amount of output force

What does a fixed pulley change?
a) the speed of a force
b) the direction of a force
c) the size of a force
d) the timing of the force

What two things must 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 oppostie 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

What is machine that is made of two simple machines?
a) simple machine
b) lever
c) pulley
d) compound machine

What is the work that you do on a machine?
a) power
b) work input
c) work output
d) lever

Force times _______________ is the formula to calculate work.
a) kinetic
b) work
c) distance
d) machines

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