# Friction and Gravity review

Flashcards by Katherine Andras, updated 11 months ago Created by Katherine Andras 11 months ago 1 0

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This is what the title says it is. ## Resource summary

 Question Answer What is a force? A push or a pull What unit of measurement is used for force? Newtons What is friction? The force two surfaces exert when they rub together What are the two factors that affect the force of friction? How hard you’re pushing and the types of surfaces What causes friction? When the irregularities of of surface rub on another surface What direction does friction move when an object is moving? The opposite direction What are the 4 types of friction? Fluid, rolling, sliding, and static What does fluid mean? A material that can easily flow What is gravity? A force that pulls objects towards each other What is the law of universal gravitation? Gravity acts between all objects What two factors affect the force of gravity? Mass and distance What is weight? The measurement of the force of gravity on an object What is mass? The measurement of how 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? 1. Weight changes depending on where you are in the universe and mass does not 2. Mass is the measurement of matter is in an object while weight is measuring the force of gravity 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/s/s What is air resistance? A type of friction that happens while experiencing fluid friction. What affects the amount of air resistance that acts on an object? How big the surface area of the object is What is terminal velocity? When air resistance equals the weight of the object What is a projectile? A thrown object What happens when you drop an object and an object is thrown horizontally forward at the same time? The objects will hit the ground at the same time because they fall at the same rate.

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