1.
Which of the following is an example of potential energy?
A moving car
A stretched rubber band
A spinning top
A burning candle
2.
Which of the following is NOT a type of simple machine?
Lever
Pulley
Wheel and axle
Engine
3.
Which of the following materials has the highest tensile strength?
Copper
Aluminum
Steel
Brass
4.
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
5.
Two gears are meshed together. The larger gear has 40 teeth, and the smaller gear has 20 teeth. If the larger gear rotates at 60 revolutions per minute (RPM), what is the rotational speed of the smaller gear?
30 RPM
60 RPM
120 RPM
240 RPM
6.
Which of the following materials is the LEAST conductive of heat?
Copper
Aluminum
Steel
Wood
7.
Which of the following is an example of potential energy?
A moving car
A spinning top
A stretched rubber band
A flowing river
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 type of force acts perpendicular to the surface of an object?
Friction
Tension
Normal force
Gravitational force
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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