Water is useful for reducing friction between objects. However, you also learned that (due to friction) moving water causes rough rocks to become smooth. How can this be?

Which factors affect the strength of the electric force between two charged objects?

Sara is sitting in the back seat as her father drives at a constant speed. If Sara's father presses on the brakes quickly slowing the car down, what slows Sara down? A. air resistance on the inside of the car B.

Name three devices or inventions which are designed to increase friction.

One hectare is defined as 10 4 m2. One acre is 4 ✕ 10 4 ft2. How many acres are in one hectare?

How many grams are in 2.73 moles of carbon dioxide

F an electron fell to a lower orbit or energy level, energy would be A. created. B. emitted. C. absorbed. D. transferred.

Which is the correct order from the closest to the sun to the farthest away from the sun? A. terrestrial planets, asteroid belt, gas planets, Kuiper belt B. gas planets, asteroid belt, terrestrial planets, Kuiper belt C.

Ethylene (C2H4) reacts with oxygen gas to produce carbon dioxide and water. 45.0 grams of ethylene reacts, how many grams of carbon dioxide gas will be produced?

What causes ice to melt and water to boil

A block of mass 3.5 kg slides down a frictionless inclined plane of length 6.4 m that makes an angle of 30 degrees with the horizontal. if the block is released from rest at the top of the incline, what is its speed at the bottom