Equations and General Knowledge

Question 1

How do you work out force?

Answer 1

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

Question 2

How do you work out stopping distance?

Answer 2

Thinking distance add braking distance

Question 3

What is thinking distance?

Answer 3

Distance a car travels in the drivers reaction time

Question 4

What is braking distance?

Answer 4

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

Question 5

How do you work out kinetic energy?

Answer 5

0.5 x mass x speed squared

1
- x m x v squared
2

Question 6

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

Answer 6

m x g x h

mass x gravitational field strength x change in height

Question 7

What is the units for gravitational field strength?

Answer 7

N/kg

N = Newton’s

Question 8

What is our gravitational field strength on earth?

Answer 8

10

Question 9

What are the 4 main energy stores?

Answer 9

mechanically
electrically
by heating
by radiation

Question 10

How do you work out efficiency?

Answer 10

useful energy transferred divided by total energy supplied

Question 11

What are the units for energy?

Answer 11

Joules (J)

Question 12

How do you work out power?

Answer 12

work done divided by time taken

Question 13

What are the units for power?

Answer 13

Watts (W)

Question 14

What is frequency measured in?

Answer 14

Hertz (Hz)

Question 15

How do you work out work done?

Answer 15

force x distance

Question 16

How do you work out wave speed?

Answer 16

Frequency x wavelength

Question 17

How do you work out acceleration?

Answer 17

change in velocity divided by time

Question 18

What are the units for acceleration?

Answer 18

m/s squared

Question 19

What do you use to measure speed of sound?

Answer 19

Oscilloscope

Question 20

What are all the electromagnet waves called?

Answer 20

radio waves
micro waves 
infra red
visible light
ultra violet
x-rays
gamma rays

Question 21

How do you work out distance?

Answer 21

Speed x time

Question 22

How do you work out speed?

Answer 22

Distance divided by time

Question 23

How do you work out time?

Answer 23

Distance divided by speed

Question 24

What is the mass and charge of a proton?

Answer 24

Mass = 1
Charge = +1

Question 25

What is the mass and charge of a neutron?

Answer 25

``` Mass = 1 Charge = 0 ```

Question 26

What is the mass and charge of an electron?

Answer 26

``` Mass = 0.0005 Charge = -1 ```

Question 27

What is a vector?

Answer 27

Vector quantities have both magnitude and direction.

Question 28

Give 4 examples of a vector.

Answer 28

Force Velocity Weight Acceleration

Question 29

What is a scalar?

Answer 29

Scalar quantities have only magnitude and no direction

Question 30

Give 4 examples of a scalar.

Answer 30

Speed Direction Mass Energy

Question 31

How do you work out momentum?

Answer 31

Mass x velocity

Question 32

What are the units for momentum?

Answer 32

kg m/s

Question 33

How do you work out force? Other equation?

Answer 33

Mass x acceleration

Question 34

How do you work out density?

Answer 34

Mass divided by volume

Question 35

How do you work out weight?

Answer 35

Mass x gravitational field strength

Question 36

How do you work out energy transferred?

Answer 36

Charge moved x potential difference

Question 37

How do you work out charge?

Answer 37

Current x time

Question 38

How do you work out potential difference?

Answer 38

Current x resistance

Question 39

How do you work out electrical power?

Answer 39

Current x potential difference

Question 40

How do you work out potential difference? Other equation?

Answer 40

Current squared x resistance

Question 41

How do you work out the force exerted on a spring?

Answer 41

Spring constant x extension