1. What is a sign that work is being done? A. Motion
B. Mass
C. Density
D. Matter
2. How do input force in output force relate to each other?
A. They are always different.
B. They are unrelated.
C. They are the same.
D. The input is always less than the output.
3. What does a screw consist of?
A. A wheel and axle in a vertical position
B. An inclined plane wrapped around a cylinder
C. A wedge wrapped around a pipe
D. A lever wrapped a pole