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Simple Machines, Part 1
Test Description: Simple machine basics and definition.
Instructions: Answer all questions to get your test result.
1) What is the work done by a simple machines on an object?
A
lever
B
power
C
work output
D
work input
2) What is the work that you do on a simple machine?
A
power
B
pulley
C
work output
D
work input
3) Which of the following causes work output to be less than work input?
A
input force
B
friction
C
output force
D
power
4) 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
5) What two things much happen for work to be done?
A
The object must move and the mechanical advantage must be greater than 1.
B
The object must move in the same direction as the force.
C
The object must move and there must be an output force.
D
The object must move in the oppostive direction of the force.
6) 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 stay the same
C
it must decrease
D
it must double
7) True or false? When you use a simple machine, you do less work.
A
False. Simple machines cause you to do more work.
B
True. Simple machines allow you to do less work.
C
False. Simple machines make work easier by creating a trade-off between force and distance.
D
True. Simple machines allow some of the work to disappear.
8) What is the device that makes work easier by changing the size and/or direction of the force?
A
force
B
watt
C
power
D
simple machine
9) What is the number of times a simple machine multiplies force?
A
power
B
mechanical advantage
C
mechanical efficiency
D
output force
10) In which situation is a person doing work on an object?
A
A student walks while wearing a backpack that weighs 5N.
B
A teacher holds a book 1 m off the floor.
C
A bodybuilder lifts a dumbell weighing 20N.
D
A woman exerts 350N of force on a rope attached to a car that does not move.
*select an answer for all questions
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