Whole Topic

Question 1

Velocity

Answer 1

The rate of change of displacement

Question 2

Acceleration

Answer 2

The rate of change of velocity

Question 3

Work done

Answer 3

A measure of the energy transferred during a process

Question 4

Law of consrvation of energy

Answer 4

Energy can neither be created or destroyed, just changes from one form to another.

Question 5

Momentum

Answer 5

The product of an object’s mass times it velocity

Question 6

Law of conservation of momentum

Answer 6

In the absence of external forces the total momentum before a collision is equal to the total momentum after a collision

Question 7

Elastic collision

Answer 7

An elastic collision is one in which kinetic energy is conserved.

Question 8

Inelastic collision

Answer 8

An inelastic collision is one in which kinetic energy is lost

Question 9

Newton’s first Law

Answer 9

An object will remain at rest or continue at constant speed in a straight line unless acted on by an unbalanced force

Question 10

Newton’s second law

Answer 10

The acceleration of an object is proportional to the unbalanced force acting on it and inversely proportional to its mass. (a = F/m)

Question 11

Newton’s third law

Answer 11

If a body A exerts a force on body B then body B exerts an equal and opposite force on body A.

Question 12

Newton

Answer 12

One Newton is the force required to give an object of mass 1kg an acceleration of 1ms-2.

Question 13

Impulse

Answer 13

Impulse is the average force on an object multiplied by the time of contact (Ft)
Impulse is also equal to the change in momentum of the object.

Question 14

Universal law of gravitation

Answer 14

The force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. F = Gmm/r2

Question 15

Gravitational field strength

Answer 15

Gravitational field strength is the force (or weight) per unit mass experienced at a point in a gravitational field. (g = F/m)

Question 16

Time dilation

Answer 16

The time between events measured by a stationary observer will be greater than that measured by an observer moving with the events.

Question 17

Length contraction

Answer 17

The length between events measured by a stationary observer will be less than that measured by an observer moving with the events.

Question 18

Doppler effect

Answer 18

The frequency of radiation observed depends on the velocity of the source relative to the observer.

Question 19

Redshift

Answer 19

Redshift is the term given to the change in frequency of light emitted by stars, as observed from earth, due to the stars moving away from us. The spectra of these stars is shifted towards the red end of the spectrum.

Question 20

Hubbles Law

Answer 20

For distant objects, the further away from Earth the object is, the faster it is moving away from Earth. v = Hod where v = recessional velocity and Ho = Hubbles constant.

Question 21

Dark Matter

Answer 21

Type of matter proposed to make up for the missing mass in the Universe.

Question 22

Dark energy

Answer 22

Type of energy proposed to make up for the missing energy in the Universe.
This is to account for the fact that the rate of expansion of the Universe is increasing.

Question 23

Cosmic Microwave Background (Radiation)

Answer 23

Observed background radiation present everywhere in the Universe. It provides evidence to support the Big Bang theory

Question 24

Anti-matter

Answer 24

Each matter particle has an antimatter particle equivalent with an opposite charge but identical mass.

Question 25

Baryon

Answer 25

A particle made up of 3 quarks

Question 26

Meson

Answer 26

A particle made up of 2 quarks

Question 27

Boson

Answer 27

Force mediating particle

Question 28

Fermion

Answer 28

Matter particle

Question 29

Hadron

Answer 29

a particle made up of quarks