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# Gravity and Friction

### This is a study guide to Any Gravity and Friction Test

What is a force? A Push or Pull
What unit of measurement is used for force? Newtons
What is friction? Friction is when to surfaces exert on each when they rub against each other
What are the two factors that affect the force of friction? How hard the surfaces push together and the types of surfaces involved.
What causes friction? Rough Surfaces
What direction does friction move when an object is moving? Opposite
What are the 4 types of friction? Sliding, Rolling, Fluid, Static
What does fluid mean? A gas or Liquid
Explain your own examples for each type of friction. Provide at least 1 example for each of the 4 types. Ball rolling on the ground. Ice skater sliding on the Ice. A Person standing in place. An airplane flying through the sky.
What is gravity? Is the force that pulls objects toward each other.
What is the law of universal gravitation? The Universal Law states that the force of gravity acts between all objects in the universe.
What two factors affect the force of gravity? Mass and Distance
What is weight? The force of gravity on a person or object at the surface of a planet is known as mass
What is mass? Is a measure of the amount of matter in an object
What unit of measurement is used to measure mass? Kilograms
What unit of measurement is used to measure weight? Newtons
What is the difference between weight and mass? One is a measure of Matter, The other is the measure of Gravity on the object
What is free fall? When the only force acting on an object is gravity.
When an object is in free fall, at what rate do all objects accelerate because of the force of gravity on Earth? 9.8 m/s2
What is air resistance? Objects falling through air experience a type of fluid friction.
What affects the amount of air resistance that acts on an object? Give at least two factors that affect air resistance. Unbalanced Forces and Acceleration
What is terminal velocity? The greatest velocity a falling object reaches.
What is a projectile? An object that is thrown
What happens when you drop an object and an object is thrown horizontally forward at the same time? Explain. The objects would hit the ground at the same time. It doesn’t matter how big the object is, it matters on how high you throw or drop each other.
Created by: dilbert.demarest