1.
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
2.
What type of simple machine is a screw?
Lever
Wheel and axle
Inclined plane
Pulley
3.
Which of the following is an example of potential energy?
A moving car
A spinning top
A stretched rubber band
A flowing river
4.
What is the mechanical advantage of an inclined plane that is 12 feet long and 4 feet high?
3
4
12
48
5.
Which of the following materials has the highest tensile strength?
Copper
Aluminum
Steel
Brass
6.
What type of force acts perpendicular to the surface of an object?
Friction
Tension
Normal force
Gravitational force
7.
Which of the following tools is best suited for measuring the inside diameter of a pipe?
Tape measure
Caliper
Protractor
Plumb bob
8.
What is the purpose of a flywheel in a mechanical system?
To increase speed
To reduce friction
To store rotational energy
To change the direction of motion
9.
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.
10.
Which of the following materials is the LEAST conductive of heat?
Copper
Aluminum
Steel
Wood
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