In what situation will mass change?

Describe the energy changes that place when the spring of a toy car is wound up and then released

Explain how the electric force between two positive charges changes under the following conditions: 1. the distance between the charges is tripled 2. the amount of one charge is doubled

What is the difference of speed and acceleration

A 75-kilogram hockey player is skating across the ice at a speed of 6.0 meters per second. What is the magnitude of the average force required to stop the player in 0.65 second? (1) 120 N (2) 290 N (3) 690 N (4) 920 N

Is it possible for the gravitational force between two 50-kg objects to be less than the gravitational force between a 50 kg object and a 5 kg object? Explain.

The scientific method is

Estimate the order of magnitude of the length of a football field, a. 10-1 m C. 104 m b. 102 m d. 100 m

What happens when light from the Sun passes through any type of matter?

A balanced chemical reaction obeys the law of

5. If you push a chair across the floor at a constant velocity, how does the force of friction compare with the force you exert? Explain.