Flashcards in Energy and motion Deck (23):

1

## what is the difference between speed and velocity?

###
speed: scalar quantity with magnitude

velocity: vector quantity with magnitude and DIRECTION

2

## formula for speed

### distance/time

3

## what does the gradient represent on a distance-time graph?

### speed

4

## what does a horizontal line represent on a distance-time graph?

### stationary

5

## formula for velocity

### displacement of time

6

## what does the gradient represent on a velocity-time graph?

### acceleration

7

## what does the area below line represent on a velocity-time graph?

### total distance travelled

8

## what does a horizontal line represent on a velocity-time graph?

### constant speed

9

## formula for acceleration and its units

###
change in velocity/time

unit: m/s^2

10

## newton's 1st law

###
- zero resultant force - object remain stationary

- forces are balanced: constant velocity

11

## newton's 2nd law

### f=ma

12

## newton's 3rd law

### for every action, there is an equal and opposite reaction

13

## what type of quantity is momentum?

### vector quantity

14

## formula for momentum

### mass x velocity

15

## units for momentum

### kg m/s

16

## how does a large force affect momentum?

### causes a fast change in momentum so greater acceleration

17

## formula for work done

###
force x distance moved in direction of force

E = fd

18

## what is difference between mass and weight?

### weight is caused by pull of gravitational force so varies on each planet, mass is how much stuff in inside remains same

19

## formula for weight

### weight = mass x gravitational field strength

20

## gravitational field strength on earth and moon

###
earth: 10 N/kg

moon: 1.6 N/kg

21

## what is gravitational potential energy?

### energy which occurs due to its vertical position in a gravitational field

22

## formula for gravitational potential energy

###
GPE= mass x g x height

GPE = mgh

23