Physics Revision

Question 1

What is Scalar?

Answer 1

A physical quantity that can be fully describe with a magnitude only.

Question 2

What is Vector?

Answer 2

A physical quantity that can be fully described with a magnitude and direction.

Question 3

What is an example of scalar?
(Name two examples)

Answer 3

Distance ,voltage ,energy ,time ,temperature ,speed ,mass ,frequency or power

Question 4

What is an example of vector?
(Name two examples)

Answer 4

Displacement, Momentum, Acceleration, Force or Velocity

Question 5

What is the equation for speed?

Answer 5

Speed (m/s) = Distance (m) / Time (s)

Question 6

A man walks 20m in 10s. What is his average speed?

Answer 6

2 m/s

Question 7

A dog runs 5 km in 10 seconds. What was his speed?

Answer 7

500 m/s

Question 8

How do you calculate Distance?

Answer 8

Distance (m) = Speed (m/s) X Time (s)

Question 9

How do you calculate Time

Answer 9

Time (s) = Distance (m) / Speed (m/s)

Question 10

A sheep runs at 12 m/s. How far will it move in 17 seconds ?

Answer 10

204 m

Question 11

Jerry the dinosaur runs at 40 m/s for 100m. How long does it take to cover this distance?

Answer 11

2.5 seconds

Question 12

What is the equation for Acceleration?

Answer 12

Acceleration (m/s2) = Change in Velocity (m/s) / Time (s)

                                   Change in Velocity (m/s) = Final Velocity - Initial Velocity

Question 13

A cat’s speed increases from 9 m/s to 21 m/s in a time of 4 seconds. What is the cat’s acceleration?

Answer 13

3m/s2

Question 14

On a distance/time graph. What is a flat line called?

Answer 14

A stationary line.

Question 15

How do you calculate distance from a velocity time graph ?

Answer 15

You do velocity x speed

Question 16

How do you calculate the stopping distance of a car?

Answer 16

Stopping distance = Thinking distance + Braking distance

Question 17

If the speed of your car is going 40 mph and your braking distance has to be 19 and your stopping distance 38 what is your thinking distance?

Answer 17

19

Question 18

What is Energy?

Answer 18

Something that is needed to make things happen and change

Question 19

What can energy be measured in ?

Answer 19

Joules (j)

Question 20

What are the 9 forms of energy ?

Answer 20

Elastic Potential, Thermal, Chemical, Light, Gravitational Potential, Kinetic, Electric, Sound and Nuclear

Question 21

Where is chemical energy stored?

Answer 21

In chemical reactions like food, fuels and chemicals.

Question 22

Where is kinetic energy stored?

Answer 22

In an object that is moving

Question 23

Where is gravitational potential energy stored?

Answer 23

In an object because of its position

Question 24

Where is Elastic potential energy stored?

Answer 24

In an object when you stretch or squash it

Question 25

Where is thermal energy stored ?

Answer 25

In an object because of its temperature

Question 26

What does The Law of Conservation of Energy state?

Answer 26

“Energy cannot be created or destroyed, it can only be changed from one form to another.”

Question 27

In what ways can energy be transferred by ?

Answer 27

Forces, Heating, Light, Sound, Electric Current

Question 28

What is a Sankey Diagram?

Answer 28

It shows what and how much energy has been transferred.

Question 29

What is the equation for efficiency?

Answer 29

Efficiency = useful energy out/ total energy in

Question 30

A lorry engine uses 2000J of chemical energy and turns this into 400J of kinetic, 1200J of heat and 400J of sound. What is the efficiency of the lorry engine?

Answer 30

20%

Question 31

What is the equation for GPE (Gravitational Potential Energy)?

Answer 31

GPE= mass (kg) x gravitational field strength (N/kg) x height (m)

Question 32

A man drops a 10kg bag of rice over a cliff that is 100m high, What is the bag of rice’s gravitational potential energy? (G=10)

Answer 32

10,000J

Question 33

What is the equation for KE (Kinetic energy)?

Answer 33

KE= 1/2 x m x v2

Question 34

What is the KE of a 68kg man travelling at 10m/s ?

Answer 34

3400m/s2

Question 35

What is Renewable Energy?

Answer 35

It is an energy source that can be replenished as it is used.

Question 36

What is Non-Renewable Energy?

Answer 36

A resource that cannot be replaced when it is used up.

Question 37

What are the 7 types of renewable energy sources ?

Answer 37

Solar, Wind, Tidal, Wave , Hydroelectric, Geothermal and Biofuel.

Question 38

What are the 4 types of Non-Renewable energy sources ?

Answer 38

Coal, Gas, Oil and Nuclear

Question 39

What are fossil fuels?

Answer 39

They are remains of living organisms millions of years ago and release heat energy when burned.

Question 40

What are the disadvantages of fossil fuels?

Answer 40

*Can’t be reused *Some of them emit Sulphur dioxide into the atmosphere (creates the greenhouse effect) *Emits CO2 into atmosphere which contributes to global warming.

Question 41

What are the advantages to Fossil Fuels?

Answer 41

Fossil fuels are cheap and easy to obtain and much of our infrastructure is dependent on it.