# Science - Forces and Motion

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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)

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.

Foot

Floor

Example: