Definitions

Question 1

Kinetic energy

Answer 1

The energy associated with motion of an object

Question 2

Gravitational Potential Energy

Answer 2

The energy an object has due to its position in a gravitational field

Question 3

Work done

Answer 3

The amount of energy converted from one form to another

Question 4

Heat

Answer 4

The amount of energy transferred from one place to another due to a temperature difference

Question 5

Efficiency

Answer 5

The useful work done divided by total energy put in

Question 6

Power

Answer 6

The amount of work done per unit time

Question 7

Velocity

Answer 7

The distance an object travels in a certain direction in 1 second

Question 8

Acceleration

Answer 8

The change in velocity in 1 second

Question 9

Terminal Speed

Answer 9

The constant speed of an object when the driving force is balanced by friction

Question 10

Amplitude

Answer 10

The maximum distance of the oscillation, from the rest point

Question 11

Period

Answer 11

The time for one complete oscillation

Question 12

Wavelength

Answer 12

The distance for one complete oscillation

Question 13

Frequency

Answer 13

The number of complete oscillations per second

Question 14

Longitudinal wave

Answer 14

A wave where the direction of oscillation is parallel to the direction of energy transferred

Question 15

Transverse wave

Answer 15

A wave where the direction of oscillation is perpendicular to the direction of energy transferred

Question 16

Isotope

Answer 16

An atom with the same number of protons but different number of neutrons

Question 17

Density

Answer 17

The amount of mass per unit volume

Question 18

Pressure

Answer 18

The force per unit area

Question 19

Conduction

Answer 19

The transfer of KE when atoms or molecules collide

Question 20

Convection

Answer 20

The movement of a fluid as a result of density differences

Question 21

Radiation

Answer 21

The transfer of energy using electromagnetic waves

Question 22

Brownian Motion

Answer 22

The random motion of atoms and molecules in a fluid

Question 23

Fluid

Answer 23

A gas or a liquid

Question 24

Gamma waves

Answer 24

An electromagnetic wave with the highest frequency

Question 25

Ultrasound

Answer 25

Sound waves with a frequency above 20000Hz

Question 26

Weight

Answer 26

The force on an object due to gravity

Question 27

Refraction

Answer 27

The change of direction of a wave when it moves from one material into another due to the change of speed

Question 28

Why does change of speed occur in refraction?

Answer 28

Due to the change of density in the materials

Question 29

Critical angle

Answer 29

The angle of incidence which produces an angle of refraction of 90 deg

Question 30

Total internal reflection

Answer 30

The reflection of a wave when it meets a boundary at an angle greater than the critical angle

Question 31

Current

Answer 31

Rate of flow of (positive) charge

Question 32

Voltage

Answer 32

The electrical potential energy difference for 1 Coulomb of charge

Question 33

Resistance

Answer 33

The voltage per unit current

Question 34

Thermal energy

Answer 34

All potential energy + KE particles inside an object

Question 35

Half life

Answer 35

The time for half of the nuclei to decay

Question 36

Ohmic Behaviour

Answer 36

The resistance does NOT change as the current changes / The current-voltage graph is a straight line

Question 37

Orbital Period

Answer 37

The time taken for a planet to orbit the Sun once