Flashcards in Newton Deck (14):

1

## Newtons 1st law

### A body will remain at rest or continue to move in a straight line at a constant velocity unless an external force acts on it

2

## Newtons 2nd law

### The resultant force on an object is directly proportional to the rate of change of momentum of the object and the momentum change takes place in the same direction as the force

3

## Newtons 3rd law

### If object A exerts a force on object B, then object B will exert an equal and opposite force on object A

4

## Equation for momentum

### p=mv

5

## Rate of change of momentum

### Net force

6

## Conservation of momentum

### Assuming that no external forces act, total momentum is always conserved

7

## Two equation for impulse

###
I=Ft

I=mv-mu

8

## How is impulse related to momentum

### It equals change in momentum

9

## Area under a force time graph

### Impulse

10

## Rules for elastic collision

###
Momentum conserved

Kinetic energy conserved

11

## Rules for inelastic collision

###
Momentum conserved

Kinetic energy not conserved

12

## When can F=ma not be used

### When objects are travelling close to the speed of light (resulting in their mass changing)

13

## The essence of all car crash safety features

### Increasing the time that it takes for the car and passengers to change their speed. This results in a lower force for the same impulse

14