Why does an object have a different weight on the moon than it does on earth? everything is weightless in space. objects move more slowly on the moon. there is no air on the moon, so objects are lighter. the earth and moon have different values for the acceleration due to gravity.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.

How do you count the total number of atoms present on one side of a chemical equation?