What simple machines is being shown in this photo ? 1. pulley
2. incline plane
3. wedge
4. wheel and axle
5.screw
6.lever

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.