Physics Gcse

Question 1

What is velocity?

Answer 1

Speed in given direction

Question 2

What is acceleration?

Answer 2

Change I’m velocity - could mean change of speed

Question 3

What is deceleration?

Answer 3

Negative acceleration

Question 4

What happens when you accelerate around a corner?

Answer 4

If you maintain the same speed you will be accelerating as your direction is changing

Question 5

How do you work out acceleration?

Answer 5

Change in velocity/time taken
Or
Final velocity-initial velocity/time taken

Question 6

What is drag?

Answer 6

Caused by forces which oppose the motion of an object

Question 7

How is air resistance caused?

Answer 7

Colliding air particles that they’re trying to go through

Question 8

3 ways a cars drag can be reduced?

Answer 8

Aerodynamics
Weight
Speed

Question 9

What is the stopping distance?

Answer 9

Time taken between becoming aware of need to stop and stopping

Question 10

What is thinking distance?

Answer 10

Becoming aware of need to stop and moving foot to break

Question 11

What is breaking distance?

Answer 11

Distance between putting foot on break and actually stopping

Question 12

What is mass?

Answer 12

Amount of matter/atoms an object has

Question 13

What is mass measured in?

Answer 13

Kg

Question 14

What is weight?

Answer 14

The force an object feels due to gravity

e.g. Astronauts say they feel weightless but they still have the same mass

Question 15

The bigger the mass…

Answer 15

…the higher the the gravity

Question 16

How to calculate weight?

Answer 16

Weight = mass x gravity

Question 17

What is work done?

Answer 17

Energy transferred during a process

Question 18

How to work out work done?

Answer 18

Force x distance moved in direction of force

Question 19

What is power?

Answer 19

How quickly energy is transferred

Question 20

What happens when energy is transferred quickly?

Answer 20

High power

Question 21

What happens when energy is transferred slowly?

Answer 21

Low power

Question 22

Ways to reduce energy?

Answer 22

Install boiler - expensive, saves most = 6.5 years to pay
Install double glazing - most expensive, saves least = £120
Install wall insulation - cheap = 2 years and 9 months to pay
Install loft insulator - short payback time = 2 years

Question 23

Types of energy?

Answer 23

Magnetic
Kinetic
Heat
Light
Gravitational potential energy
Chemical
Sound
Electric
Elastic potential
Nuclear

Question 24

What is gravitational potential energy?

Answer 24

Energy stored in an object in a g.p. field

Question 25

How to work out gravitational potential energy?

Answer 25

Mass x g.field x height

Question 26

How to work out momentum?

Answer 26

Mass x velocity

Question 27

What's the law of conservation of momentum?

Answer 27

Momentum before an event must be equal to momentum after

Question 28

What is flow of electrons called?

Answer 28

Current

Question 29

How is current measured?

Answer 29

With an ammeter, how fast negative charge flows around the circuit

Question 30

What is an analogy?

Answer 30

Compare on situation to the other and understand idea as accurately as possible

Question 31

What is Ohm's Law?

Answer 31

Potential difference = current x resistance

Question 32

How does p.d. behave in a series circuit?

Answer 32

P.d. gained by cells is divided between two components

Question 33

How does current behave in a series circuit?

Answer 33

All current is equal in all parts

Question 34

What happens in a parallel circuit?

Answer 34

Current splits between each branch

Question 35

What happens to the resistance when the temp of a resistor increases?

Answer 35

Atoms vibrate more

Question 36

What is the earth wire (g+y)?

Answer 36

Transfers energy away from device if there's a fault

Question 37

What is the neutral wire (blue)?

Answer 37

Completes circuit and has p.d. of 0V

Question 38

What is the live wire (brown)?

Answer 38

Provides energy to device - p.d. = 230V

Question 39

Why is copper good for wires?

Answer 39

Good conductor Malleable Won't retract when bent

Question 40

Why is brass good for pins?

Answer 40

Good conductor Harder than copper Does not corrode

Question 41

How do you work out power?

Answer 41

Energy/time Or Current x p.d.