Explain how a thumbtack is designed so that you do not have to use a lot of force to push it through paper or the surface of a bulletin board.

Which of the following is an example of units for speed

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.