Four friends are studying how balls move down a ramp. They want to see how the motion of the balls changes when different materials are used for the balls and ramp. They keep the ramp at the same length and height. The balls are all the same size. Ball Material Ramp Material Rubber Wood Wood Cardboard Glass Plastic Displacement What are the friends most likely trying to study? A. the time it takes each ball to travel down the ramp B. the thickness of the ramp and the size of the balls ot vew C. the distance that each ball travels down the ramp D. the heat that is made when each ball travels down the ramp

A student measures the mass of an object with a scale several times, resulting in an average mass m = 11.29 grams. Another student points out that the scale was not “zeroed”, or calibrated to read zero mass with no object on it, before the object was weighed. Without a load, the scale reads 0.08 grams. No one has used the scale since the last measurement.  c) What is the correct mass of the object?

select the statements which is true for momentum. choose all that apply.   A. Momentum is the product of mass and velocity. That means object with huge mass is at rest has no momentum at all.   B. Momentum is only conserved in collisions   C. Momentum is a vector quanity.   D. Momentum is always conserved.

A student plays tennis several times a week. She notices that the tennis ball seems to bounce higher on some courts than on other courts. She wonders if this has something to do with the surface of the court. Identify the Independent Variable. *