P2- Physics

Question 1

What is acceleration ?

Answer 1

Is how quickly the velocity is changing speed or direction

Question 2

What is the difference between weight and mass ?

Answer 2

Mass is the amount of stuff in an object weight is caused by the pull of the gravitational force mass is in kg weight is in Newtons

Question 3

What is the resultant force ?

Answer 3

Is the overall force on a point or object it results in a change of velocity

Question 4

What is stopping distance ?

Answer 4

The sum of thinking Distance and braking distance

Question 5

What is thinking distance affected by ?

Answer 5

How fast you are going and how aware you are

Question 6

What is braking distance affected by ?

Answer 6

How fast your going how good your brakes are how good the tyres are and how good the grip is

Question 7

What is kinetic energy ?

Answer 7

Is energy of movement the more an object weighs and the faster it’s going the greater the kinetic energy

Question 8

What is power ?

Answer 8

The rate of doing work

Question 9

What is momentum ?

Answer 9

Property of moving objects the greater the mass and the greater it’s velocity the more momentum the object has

Question 10

How does force affect momentum ?

Answer 10

A larger force means a faster change of momentum so a greater acceleration

Question 11

What happens when u apply the brakes on a car ?

Answer 11

Work is done the brakes reduce the kinetic energy of the car and transfers it to heat energy

Question 12

What is a build up of static caused by ?

Answer 12

Friction

Question 13

What is the current ?

Answer 13

The flow of electrical charge round the circuit

Question 14

What is potential difference ?

Answer 14

The driving force that pushes the current round

Question 15

What is resistance ?

Answer 15

Anything in the circuit that slows the flow down resistance increase with temperature

Question 16

What does an ammeter do ?

Answer 16

Measures the current must be placed in a series can be lit anywhere in the main circuit

Question 17

What does a voltmeter do ?

Answer 17

Measures the potential difference across the component must be placed in parallel around the component

Question 18

What happens to the current in a diode ?

Answer 18

The current only flows in one direction

Question 19

What happens to the resistance of a thermistor we temperature increases ?

Answer 19

The resistance of the thermistor decreases

Question 20

What happens in a series circuit?

Answer 20

Potential difference is shared , the current is the same everywhere, resistance adds up and the cell voltages add up

Question 21

What happens in parallel circuits ?

Answer 21

The potential difference is the same , the current is shared

Question 22

What is the uks main supply ?

Answer 22

230 volts

Question 23

What did Rutherford discover from the plum pudding model ?

Answer 23

The nucleus must have a positive charge

Question 24

Definition of alpha particles

Answer 24

Has two neutrons and two protons they are big and heavy so they don’t penetrate far into materials, because they are large they are strongly ionising

Question 25

Definition of beta particles

Answer 25

Are electrons move quite fast and small penetrate moderately and have a long range in air

Question 26

What are gamma rays ?

Answer 26

Very short wavelength EM waves they penetrate far into materials and pass straight through air they are weakly ionising and have no mass and no charge

Question 27

What is half live ?

Answer 27

Is the average time it takes for the number of nuclei in a radioactive isotope to half

Question 28

What is nuclear fission ?

Answer 28

The splitting up of big atomic nuclei a slow moving neutron is absorbed into a Uranium or plutonium nucleus this causes the Neuton to split which spits out another two or 3 neutrons the chain reaction then continues

Question 29

What is nuclear fusion ?

Answer 29

The joining of small atomic nuclei only happens at very high temperatures

Question 30

How does a protostar form?

Answer 30

Starts initially form from clouds of dust and gas gravity causes them to spiral forming a protostar

Question 31

What happens after a protostar ?

Answer 31

Gravitation energy is converted to heat energy so temperature rises the hydrogen nuclei then undergo
Nuclear fusion to give out heat and light a start is then born

Question 32

How does a main sequence star then form ?

Answer 32

Starts enter a long stable period due to masses of hydrogen

Question 33

How does a red giant form ?

Answer 33

The hydrogen Begins to run out red giant forms and is red because the surface cools