Newton’s first law of motion states that an object at rest stays at rest, and an object in motion stays in motion, unless acted on by an unbalanced force.

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp

Explain why electric current cannot exist if a current doesn't have a voltage source.

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?