What are the two ways to change the frictional force between two solid surfaces

In 2 seconds, a ball travels 100 cm. What is the average speed of the ball?

How long does it take for earth to revolve around the sun?

If all the light waves are absorbed by an object then the object will appear A) black B) brown C) gray D) white

A ball having a mass of 200 g is released from rest at a height of 400 mm above a very large fixed metal surface. If the ball rebounds to a height of 325 mm above the surface, determine the coefficient of restitution between the ball and the surface.

Two particles are separated by a certain distance. the force of gravitational interaction between them is f0. now the separation between the particles is tripled. find the new force of gravitational interaction f1.

A stone is thrown vertically upward with a speed of 12m/s from the edge of a cliff 70 m high (a) How much later it reaches the bottom of the cliff? (b) What is its speed just before hitting? And (c) what total distance did it travel? (Ans: 5.

After completing a career search, Patrick has decided that he wants to be a paralegal. Which two skills or abilities are important for him to have in order to excel in this career?

The highest peak in the vicinity (<100 kilometers) of Mt. Kilimanjaro is located to the: a. north. b. west c. east. d. south. e. northeast

Which of the following lists contains only examples of renewable sources of energy? A. wind, tidal, geothermal, and hydroelectric B. coal, solar, wind, and biomass C. fossil fuels and nuclear energy D. hydroelectric, petroleum, solar, and wind

The part of a longitudinal wave that is least dense is called a (n) rarefaction refraction contraction compression