Science - Forces and Motion

Created by kjones12345 

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Force

A push or pull from one object to another

Examples of forces

gravity, friction, magnetism, air resistance, pushing, pulling

Gravity

A force that pulls all objects together.

Objects

These all have gravity.

The more mass an object has

Its' gravity increases.

As distance between objects increases

Gravity decreases

The less mass an object has

Its' gravity decreases.

As distance between objects decreases

Gravity increases

Friction

A force between two objects where one object works to slow down or stop the motion of the other object.

Rubbing hands together

Example of friction

Smooth surfaces

These have less friction than rough surfaces

Ice or glass

Example of surfaces with low amounts of friction.

Grass or gravel

Example of surfaces with high amounts of friction.

Rough surfaces

These have more friction than smooth surfaces

Air resistance

This is caused by air hitting an object and slowing it down.

Drag

This is the effect of air resistance.

Why parachutes work

They slow people down falling to the ground because of air resistance.

Flat sheet of paper

This falls to the ground slower than crumpled paper because of air resistance.

Newton's First Law

An object at rest remains at rest and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force

Newton's Third Law

for every action, there is an equal and opposite reaction (action/reaction forces)

Forces always happen in these

pairs

Action/Reaction

These foces are always equal and in opposite directions. Newton's Third Law of Physics.

Ball and bat - why does ball fly

The mass of the bat is greater.

Floor and foot - which is the action force

Foot

Floor and foot - which is the reaction force

Floor

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