Keywords + Defintions

Question 1

Pico

Answer 1

10^-12

Question 2

Nano

Answer 2

10^-9

Question 3

Micro

Answer 3

10^-6

Question 4

Milli

Answer 4

10^-3

Question 5

Centi

Answer 5

10^-2

Question 6

Kilo

Answer 6

10^3

Question 7

Mega

Answer 7

10^6

Question 8

Giga

Answer 8

10^9

Question 9

Tera

Answer 9

10^12

Question 10

Newton

Answer 10

The force which gives a mass of 1kg an acceleration of 1ms^-2

Question 11

Joule

Answer 11

The work done by a force of 1N moving an object 1N in the direction of the force

Question 12

Watt

Answer 12

The power transferred by one joule per second

Question 13

Displacement

Answer 13

The distance moved by an object in a particular distance

Question 14

Instantaneous speed

Answer 14

The speed at the precise instant that is measured. An example would be a car’s speedometer

Question 15

Average speed

Answer 15

The speed calculated during a period of time

Question 16

Speed

Answer 16

Rate of change of distance.

Speed = change in distance/time

Question 17

Velocity

Answer 17

Rate of change displacement

Velocity = change of displacement / time

Question 18

Acceleration

Answer 18

Rate of change of velocity.

Acceleration= change in velocity/time

Question 19

Density

Answer 19

Density = Mass/volume

Question 20

Torque of a couple

Answer 20

One of the forces x perpendicular distance between the forces

Question 21

Moment of a force

Answer 21

Force x perpendicular distance from pivot

Question 22

Power

Answer 22

The rate of work done

Power = energy/time

Question 23

Work done by a force

Answer 23

Force x distance moved in the direction of the force

Question 24

Power

Answer 24

The rate of work done

Power = energy/time

Question 25

Force constant of a spring

Answer 25

Force per unit extension

Question 26

Scalar quantity

Answer 26

A quantity with magnitude only

Question 27

Vector quantity

Answer 27

A quantity with both magnitude and direction

Question 28

Terminal velocity

Answer 28

The velocity of a falling object when Weight=drag

Question 29

Centre of gravity

Answer 29

A point where the entire weight of an object appears to act

Question 30

Thinking distance

Answer 30

The distance recalled by the car in the time taken by the driver to react

Question 31

Braking distance

Answer 31

The distance travelled by the car after the brakes are applied until the car stops

Question 32

Stopping distance

Answer 32

Thinking distance + braking distance

Question 33

Principle of conservation of energy

Answer 33

Energy cannot be greeted or destroyed; it can only be transferred into other forms

Question 34

Principle of moments

Answer 34

For an object in equilibrium, the sum of the clockwise moments about a point = the sum of anti-clockwise moments about the same point

Question 35

Hooke’s law

Answer 35

Extension of a spring is proportional to the force applied as long as the elastic limit is not exceeded

Question 36

Stress

Answer 36

Force/Area

Question 37

Strain

Answer 37

Extension/original length

Question 38

Young’s modulus

Answer 38

Young’s modulus = stress/strain

This is only the case if the elastic limit is not reached

Question 39

Ultimate tensile strength

Answer 39

The breaking stress of a material

Question 40

Elastic deformation

Answer 40

Material returns to original shape when the force is removed

Question 41

Plastic deformation

Answer 41

Material does not return to original shape when the force is removed

Question 42

Coulomb

Answer 42

The charge transferred by a 1 ampere current in one second

Question 43

Volt

Answer 43

1 joule per coulomb