Equations and General Knowledge Flashcards

(41 cards)

1
Q

How do you work out force?

A

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

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2
Q

How do you work out stopping distance?

A

Thinking distance add braking distance

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3
Q

What is thinking distance?

A

Distance a car travels in the drivers reaction time

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4
Q

What is braking distance?

A

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

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5
Q

How do you work out kinetic energy?

A

0.5 x mass x speed squared

1
- x m x v squared
2

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6
Q

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

A

m x g x h

mass x gravitational field strength x change in height

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7
Q

What is the units for gravitational field strength?

A

N/kg

N = Newton’s

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8
Q

What is our gravitational field strength on earth?

A

10

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9
Q

What are the 4 main energy stores?

A

mechanically
electrically
by heating
by radiation

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10
Q

How do you work out efficiency?

A

useful energy transferred divided by total energy supplied

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11
Q

What are the units for energy?

A

Joules (J)

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12
Q

How do you work out power?

A

work done divided by time taken

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13
Q

What are the units for power?

A

Watts (W)

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14
Q

What is frequency measured in?

A

Hertz (Hz)

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15
Q

How do you work out work done?

A

force x distance

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16
Q

How do you work out wave speed?

A

Frequency x wavelength

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17
Q

How do you work out acceleration?

A

change in velocity divided by time

18
Q

What are the units for acceleration?

19
Q

What do you use to measure speed of sound?

20
Q

What are all the electromagnet waves called?

A
radio waves
micro waves 
infra red
visible light
ultra violet
x-rays
gamma rays
21
Q

How do you work out distance?

22
Q

How do you work out speed?

A

Distance divided by time

23
Q

How do you work out time?

A

Distance divided by speed

24
Q

What is the mass and charge of a proton?

A
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
31
How do you work out momentum?
Mass x velocity
32
What are the units for momentum?
kg m/s
33
How do you work out force? Other equation?
Mass x acceleration
34
How do you work out density?
Mass divided by volume
35
How do you work out weight?
Mass x gravitational field strength
36
How do you work out energy transferred?
Charge moved x potential difference
37
How do you work out charge?
Current x time
38
How do you work out potential difference?
Current x resistance
39
How do you work out electrical power?
Current x potential difference
40
How do you work out potential difference? Other equation?
Current squared x resistance
41
How do you work out the force exerted on a spring?
Spring constant x extension