Physics - Keywords

Question 1

A vector quantity has …….

Answer 1

A magnitude (size) and a direction

Question 2

A scalar quantity has …….

Answer 2

A magnitude (size) only

Question 3

Distance is ……..

Answer 3

Just how far an object has moved

Question 4

Displacement measures …….

Answer 4

The distance and direction in a straight line from an object’s starting point to its finishing point

Question 5

Speed is …….

Answer 5

Just how fast you’re going with no regard to the direction

Question 6

Velocity is …….

Answer 6

Speed in a given direction

Question 7

Acceleration is ……

Answer 7

The change in velocity in a certain amount of time

Question 8

Newton’s First Law states …….

Answer 8

’ if the resultant force on a stationary object is zero, the object will remain stationary. If the resultant force on a moving object is zero, it’ll just carry on moving at the same velocity (same speed and direction)

Question 9

Mass is ………

Answer 9

The amount of stuff in an object

Question 10

Weight is ……..

Answer 10

The force acting on an object due to gravity

Question 11

Newton’s Third Law states………

Answer 11

’ when two objects interact, the forces they exert on each other are equal and opposite ‘

Question 12

Momentum is …….

Answer 12

A property that all moving objects have

Question 13

The law of conservation states …….

Answer 13

Energy can be stored, transferred between stores and dissipated but it can never be created or destroyed

Question 14

Amplitude is……..

Answer 14

The maximum height of the wave from a displacement point

Question 15

Wavelength is….

Answer 15

The distance from peak to peak

Question 16

A wave transfers……..

Answer 16

Energy and information without transferring matter

Question 17

The frequency of a wave passing a stationary point is …….

Answer 17

How many waves there are per second

Question 18

The period of a wave is……

Answer 18

How long one wave takes

Question 19

Newton’s Second Law states…..

Answer 19

The larger the resultant force acting on an object, the more the object accelerates - the force and acceleration are directly proportional.

F= m x a

Question 20

Mechanical energy transfer is….

Answer 20

A force acting on an object

E.g. pushing, stretching, squashing

Question 21

Electrical energy transfer is…..

Answer 21

A charge doing work against resistance

E.g. charges moving round a circuit

Question 22

Heat energy transfer is….

Answer 22

Energy transferred from a hotter object to a colder object

E.g. heating a pan on a hob

Question 23

Radioactive energy transfer is…

Answer 23

Energy transferred by waves

E.g. energy from the sun reaching earth by light

Question 24

Traverse waves are…..

Answer 24

The oscillations which are perpendicular at 90° to the direction the wave travels.

• electromagnetic waves
• S-waves ( type of seismic wave )
• Ripples and waves in water

Question 25

Longitudinal waves are.....

Answer 25

The vibrations which are parallel to the direction the wave travels . - sound waves - P-waves ( a seismic wave )

Question 26

Electromagnetic waves are.....

Answer 26

Traverse waves. They all travel at the same speed through a vacuum. But they travel at different speeds in different materials.

Question 27

An Isotope is ....

Answer 27

Is an element with the same number of protons and electrons and different number of neutrons which changes the mass number.

Question 28

Alpha radiation is....

Answer 28

When an alpha particle is emitted from the nucleus. An alpha particle is two neutron and two protons ( like a helium nucleus )

Question 29

Half life is ....

Answer 29

The time taken for half the radioactive nuclei to decay

Question 30

Activity of a .....

Answer 30

Sample is how many nuclei that haven’t yet destroyed

Question 31

Beta Minus decay involves a...

Answer 31

Down quark changing into and up quark ~ a neutron becomes a proton and emits an electron

Question 32

Beta Plus decay involves an....

Answer 32

Up quark changing into a down quark ~ a proton becomes a neutron and emits a positron