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 an example of a first-class lever?
Wheelbarrow
Nutcracker
Crowbar
Tweezers
3.
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.
4.
Which of the following is NOT a type of simple machine?
Lever
Pulley
Wheel and axle
Engine
5.
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.
6.
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
7.
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.
8.
Which of the following materials has the highest tensile strength?
Copper
Aluminum
Steel
Brass
9.
What type of force acts perpendicular to the surface of an object?
Friction
Tension
Normal force
Gravitational force
10.
A block and tackle system has 4 ropes supporting the load. If the load weighs 400 pounds, what is the tension in each rope?
100 pounds
400 pounds
800 pounds
1600 pounds
Questions Answered: 0/10