1.
What type of force acts perpendicular to the surface of an object?
Friction
Tension
Normal force
Gravitational force
2.
A lever is used to lift a heavy object. The object is placed 2 feet from the fulcrum, and the effort is applied 4 feet from the fulcrum. If the object weighs 100 pounds, how much effort is required to lift it?
50 pounds
100 pounds
200 pounds
400 pounds
3.
Which of the following machines is an example of a compound machine?
A pulley
A bicycle
A lever
A wheelbarrow
4.
Which of the following statements about friction is true?
Friction always produces heat.
Friction increases with the weight of the object.
Friction is independent of surface area.
All of the above.
5.
What is the mechanical advantage of an inclined plane that is 12 feet long and 4 feet high?
3
4
12
48
6.
Which of the following is an example of potential energy?
A moving car
A stretched rubber band
A spinning top
A burning candle
7.
Which of the following is an example of a first-class lever?
Wheelbarrow
Nutcracker
Crowbar
Tweezers
8.
In a system of gears, what happens to the speed of rotation of the output gear if it has fewer teeth than the input gear?
It rotates faster.
It rotates slower.
It does not affect speed.
It stops rotating.
9.
What is the purpose of using ball bearings in a mechanical system?
To increase friction
To reduce friction
To increase weight
To generate electricity
10.
A lever is used to lift a heavy object. If the distance from the fulcrum to the point where the force is applied is doubled, what happens to the amount of force needed to lift the object?
It is halved.
It remains the same.
It is doubled.
It is quadrupled.
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