Equations and General Knowledge Flashcards Preview

Physics > Equations and General Knowledge > Flashcards

Flashcards in Equations and General Knowledge Deck (41)
Loading flashcards...
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

Give 4 examples of a scalar.

Speed
Direction
Mass
Energy