Flashcards in P2 Forces And Motion Deck (13):

1

## Resultant force

###
Total force

40N -> [object]

2

## Momentum

###
Is a vector

Calculation: m = P/v

M = mass, v = velocity, p = momentum

Measured in Kgm/s(kilogram meters/second)

3

## Resultant force formula

###
mv-mu mv = final momentum, mu = starting momentum

———

F*t

4

## Newton’s first law

### An object will move at a constant speed unless an external force acts upon it

5

## Centripetal force

### The resultant force which causes an object to move in a circle, changing its velocity but not speed. E.g. provided by wires on a chairoplain

6

## Mass, weight, gravity formula

### M = W/G

7

## Acceleration due to gravity on earth

### 10 m/s^2

8

## Newton’s second law

### Force = mass * acceleration

9

## Newton’s third law

### For every action there is an equal and opposite reaction

10

## Differences between action-reaction and balanced forces

###
Action-reaction forces act on different objects

Balanced forces act on the same object

Action-reaction forces are ALWAYS the same type of force

Balanced forces are NOT always the same types of force

11

## Stopping distance has 2 parts to it:

###
Thinking distance

Braking distance

12

## Typical stopping distances

###
20 mph: 12m(6 thinking, 6 breaking)

30 mph: 23m(9 thinking, 14 breaking)

40 mph: 36m(12 thinking, 24 breaking)

50 mph: 53m(15 thinking, 38 breaking)

60 mph: 73m(18 thinking, 55 breaking)

70 mph: 96m(21 thinking, 75 breaking)

13