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

At what rate does gravity cause objects to accelerate at sea level on earth

How many LEDs must be combined into one light source to give a total of 3.8 W of visible-light output (comparable to the light output of a 100 W incandescent bulb) ?

This is a velocity versus time graph of a car starting from rest. If the area under the line is 10 meters, what is the corresponding time interval?

A vertical wire carries current in the upward direction. An electron is traveling parallel to the wire. What is the angle ααalpha between the velocity of the electron and the magnetic field of the wire? Express your answer in degrees.

Why does paper feel different after it has been wet and dried?

a scientist spends most her time observing the motion of an object and how they behave which branch of science is she studying?

Disregarding air resistance, what is the speed of a ball dropped from 12 feet just before it hits the ground? (Use 1 ft = 0.30 m, and use g = 9.8 m/s2.)

Diffraction and interference demonstrate which concept? A) particle nature of light B) wave nature of light C) polarization of light D) refraction of light

Which is an example of a solution? A) sugar water B) muddy water C) sand and water D) cereal and milk

An atom of this element would have a very easy time losing one electron to form an ionic bond with an atom of an element that would easily accept it: