P2

Question 1

Whenever two objects interact, the forces they exert on each other are?

Answer 1

Equal and opposite.

Question 2

A number of forces acting at a point may be replaced by a single force that has the same effect on the motion as the original forces all acting together. This single force is called?

Answer 2

The resultant force.

Question 3

A resultant force acting on an object may cause a change in its state of?

Answer 3

Rest or motion.

Question 4

The velocity of an object is?

Answer 4

its speed in a given direction.

Question 5

When a vehicle travels at a steady speed the resistive forces?

Answer 5

balance the driving force.

Question 6

The greater the speed of a vehicle the?

Answer 6

greater the braking force needed to stop it in a certain distance.

Question 7

The faster an object moves through a fluid the

Answer 7

greater the frictional force that acts on it.

Question 8

Explain Terminal Velocity?

Answer 8

When the resultant force reaches 0 and the object is moving as fast as it will go.

Question 9

A force applied to an elastic object such as a spring will?

Answer 9

result in the object stretching and generate elastic potential energy.

Question 10

When an object speeds up or slows down, its kinetic energy

Answer 10

increases or decreases.

Question 11

The momentum of an object is the product of

Answer 11

the object’s mass and velocity

Question 12

When a force causes an object to move through a distance

Answer 12

work is done.

Question 13

W is the work done in

Answer 13

in joules, J

Question 14

F is the force applied in

Answer 14

newtons, N

Question 15

Gravitational potential energy is the energy that an object

Answer 15

Generates the higher they move a away from the attracting object. (To a certain point.)

Question 16

The current in an electric circuit depends on

Answer 16

the resistance of the components and the supply.

Question 17

When certain insulating materials are rubbed against each other they become electrically charged. Negatively charged electrons are

Answer 17

rubbed off one material and onto the other.

Question 18

Name three wires in a three-core cable?

Answer 18

Earth
Neutral
Live

Question 19

How does RCCB stop you from getting electrocuted?

Answer 19

Sense the drop in the current and cuts the circuit

Question 20

Radioactive decay can b triggered by certain chemical reactions
True or false?

Answer 20

True

Question 21

What does a negative value for acceleration mean?

Answer 21

Deceleration

Question 22

What happens to the gradient of the line on a distance time graph if the speed increases

Answer 22

Gradient increases

Question 23

How can an objects travelling at a steady speed b accelerating?

Answer 23

By changing its direction

Question 24

What part of a velocity time graph represents distance travelled?

Answer 24

Area between the line drawn on the x axis. (Area drawn in squares on the graph) and the shape made by the velocity per second,

Question 25

What happens to an object moving at a steady speed if the resultant force on it is 0

Answer 25

The objects continues to move at a steady speed

Question 26

When will a resultant force cause a deceleration

Answer 26

When the opposing force is acting in the opposite direction to the motion

Question 27

What happens to the acceleration of an object as the resultant force increases?

Answer 27

The acceleration increases

Question 28

What does Hooke's law state?

Answer 28

The extension of a spring or wire is directly proportional to the force applied provided the limit of proportionality is not exceeded.

Question 29

When is work done by a force?

Answer 29

Work is done whenever a force moves something over a distance.

Question 30

What is the relationship between work and energy?

Answer 30

Work done = energy transferred

Question 31

What is the unit of power?

Answer 31

W or watts

Question 32

What is the unit of momentum?

Answer 32

Kgm/s or m/s

Question 33

Why is a gymnast less likely to injure herself if she lands on a thick foam then if she lands on a hard floor?

Answer 33

A foam Matt increases the impact time. The hard floor does not absorb the impact as well.

Question 34

In terms of electrons, how does an insulator become positively charged?

Answer 34

It loses electrons

Question 35

What's sort of force will there be between two negatively charged objects

Answer 35

A repelling force

Question 36

What is an ohmic conductor?

Answer 36

A conductor that obeys ohms law

Question 37

What is ohms law?

Answer 37

(volt, V) = current (ampere, A) × resistance (ohm, Ω ) | V/I R triangle where i is amps

Question 38

Explain the shape on a line on a current potential difference graph for a diode

Answer 38

It will stop at a certain value because it's travelling the opposite direction.

Question 39

A series circuit contains a variable resistor. If it's resistance increases what happens to the potential difference (Volts/V) across it?

Answer 39

The potential difference across it increases

Question 40

Where should an ammeter and a volt meter b placed in a circuit to measure the current through?

Answer 40

The ammeter should b placed in series and the voltmeter in parallel with the resistor/lightbulb

Question 41

What is the potential difference of the mains supply?

Answer 41

230v

Question 42

What is the frequency of mains supply

Answer 42

50 Hz

Question 43

What is the peak voltage of mains supply?

Answer 43

+/- 325V

Question 44

What colour is the neutral wire?

Answer 44

Blue

Question 45

What does the cover on an earth wire look like?

Answer 45

It has green and yellow stripes

Question 46

Why is the outer cover of a three pin plug made of plastic?

Answer 46

Plastic is a good electrical insulator

Question 47

What is the unit of charge?

Answer 47

Coulomb, C

Question 48

What is a circuit breaker?

Answer 48

An electromagnet switch that opens and cuts off the supply of the current is bigger than a certain value

Question 49

What is the effect of pressure of the rate of radioactive decay

Answer 49

No effect

Question 50

Background radiation?

Answer 50

Radiation that is around us all the time

Question 51

What was Rutherfords Alpha particle scattering experiment

Answer 51

Firing alpha atoms at a thin metal foil

Question 52

What happens the mass number of a nucleus when it emits a beta atom?

Answer 52

It stays the same

Question 53

What happens to the atomic number of a nucleus when it emits a beta atom?

Answer 53

It goes up by 1

Question 54

What happens to a atomic number of a nucleus when it emits an alpha particle

Answer 54

It goes down by 2

Question 55

What happens to the mass number of a nucleus when it emits an alpha particle

Answer 55

It goes down by 4

Question 56

Why is gamma radiation not deflected by electric and magnetic fields?

Answer 56

Gamma radiation is uncharged

Question 57

What has happened to the number of atoms undergoing nuclear decay in a sample after three half lives has past

Answer 57

Decreased to one 8th of a original value

Question 58

Why is alpha radiation unsuitable for monitoring the thickness of metal foil

Answer 58

Alpha radiation will not b able to pass through the foil

Question 59

What is a fissionable isotope?

Answer 59

An isotope that can undergo the process of fission

Question 60

Which two fissionable isotopes are used in nuclear reactors

Answer 60

Uranium | Plutonium

Question 61

When does a chain reaction occur?

Answer 61

When each fission event causes further fission events

Question 62

What is nuclear fission

Answer 62

The process of forcing two nuclei close enough together so they form a single larger nucleus

Question 63

How can nuclei be made to come close enough to fuse

Answer 63

Can b brought about by making two light nuclei collide at very high speed

Question 64

How long did it take for the temperature of the universe to fall enough so that uncharged atoms are formed

Answer 64

Millions of years

Question 65

Why is a black hole black

Answer 65

Light can't escape its gravity

Question 66

When is a Black hole formed

Answer 66

After a supernova if the star's mass is big enough

Question 67

What is voltage (V)

Answer 67

Potential difference across a component in a circuit is measured using a voltmeter (Electrical pressure)