Flashcards in Equations and General Knowledge Deck (41)

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1

## How do you work out force?

### change in momentum (kg m/s) divided by time (s)

2

## How do you work out stopping distance?

### Thinking distance add braking distance

3

## What is thinking distance?

### Distance a car travels in the drivers reaction time

4

## What is braking distance?

### Distance taken to stop a car once the brakes have been applied

5

## How do you work out kinetic energy?

###
0.5 x mass x speed squared

1

- x m x v squared

2

6

## How do you work out the change in gravitation potential energy?

###
m x g x h

mass x gravitational field strength x change in height

7

## What is the units for gravitational field strength?

###
N/kg

N = Newton's

8

## What is our gravitational field strength on earth?

### 10

9

## What are the 4 main energy stores?

###
mechanically

electrically

by heating

by radiation

10

## How do you work out efficiency?

### useful energy transferred divided by total energy supplied

11

## What are the units for energy?

### Joules (J)

12

## How do you work out power?

### work done divided by time taken

13

## What are the units for power?

### Watts (W)

14

## What is frequency measured in?

### Hertz (Hz)

15

## How do you work out work done?

### force x distance

16

## How do you work out wave speed?

### Frequency x wavelength

17

## How do you work out acceleration?

### change in velocity divided by time

18

## What are the units for acceleration?

### m/s squared

19

## What do you use to measure speed of sound?

### Oscilloscope

20

## What are all the electromagnet waves called?

###
radio waves

micro waves

infra red

visible light

ultra violet

x-rays

gamma rays

21

## How do you work out distance?

### Speed x time

22

## How do you work out speed?

### Distance divided by time

23

## How do you work out time?

### Distance divided by speed

24

## What is the mass and charge of a proton?

###
Mass = 1

Charge = +1

25

## What is the mass and charge of a neutron?

###
Mass = 1

Charge = 0

26

## What is the mass and charge of an electron?

###
Mass = 0.0005

Charge = -1

27

## What is a vector?

### Vector quantities have both magnitude and direction.

28

## Give 4 examples of a vector.

###
Force

Velocity

Weight

Acceleration

29

## What is a scalar?

### Scalar quantities have only magnitude and no direction

30