Friction is a force that ___ or works against motion

What is transferred to an object when is done A:energy B:force C:effort D:resistance

A tennis ball bounces on the floor three times. If each time it loses 22.0% of its energy due to heating, how high does it rise after the third bounce, provided we released it 2.3 m from the floor?

A bar of pure gold is heated to 95.0 degrees Celsius. The specific heat capacity of gold is 1.29 X 10^2. The gold is placed into 500 mL of ethyl alcohol initially at a temperature of 25 Celsius. The final temperature of the mixture is 27.0 Celsius.

A small block of mass 0.91 kg slides without friction on a horizontal table. initially it moves in a circle of radius r0 = 0.63 m with a speed 1.5 m/s. it is held in its path by a string that passes through a small hole at the center of the circle.

What are the three factors needed for Newton's Second Law?

Which phases of matter do molecules have the lowest amount of energy?

How many Oxygen (O) atoms are in the following? H2O + CO2 4 3 2

How does surface roughness affect friction

Why does it hurt your hands when you carry heavy shopping in carrier bags?

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?