SI Units

Question 1

Length

Answer 1

Metre (M)

Question 2

Time

Answer 2

Second (S)

Question 3

Mass

Answer 3

Kilogram (Kg)

Question 4

Current

Answer 4

Ampere (A)

Question 5

Temperature

Answer 5

Kelvin (K)

Question 6

Amount

Answer 6

Mole (mol)

Question 7

Speed

Answer 7

ms^-1

Question 8

Acceleration

Answer 8

ms^-2

Question 9

Force

Answer 9

kgms^-2 / Newton (N)

Question 10

Pressure

Answer 10

kgm⁻¹s⁻²/ pascal (Pa)

Question 11

Work

Answer 11

kgm²s⁻² / Joule (J)

Question 12

Charge

Answer 12

As / coulomb (C)

Question 13

Voltage

Answer 13

Kgm²s⁻³A⁻¹/ volt (v)

Question 14

Resistance

Answer 14

Kgm²s⁻³A⁻²/ ohm (Ω)

Question 15

Scalars

Answer 15

Scalars have magnitude (size) only e.g. distance, speed, volume, energy.

Question 16

Vectors

Answer 16

Vectors have magnitude (size) and direction e.g. distance, velocity, force, momentum, acceleration.

Question 17

Newtons First law

Answer 17

A body will stay at rest or in constant motion unless acted upon by an external force

Question 18

Newtons second law

Answer 18

The rate of change of momentum of an object is proportional to the resultant force acting upon it, and takes place in the direction of the force (F=ma).

Question 19

Newtons third law

Answer 19

For every action there is an equal but opposite reaction (the force of A on B is equal and opposite tho the force of B on A)

Question 20

Equation for Moment of a force

Answer 20

Fd = N × L

Question 21

Quantity

Answer 21

Number × Unit

Question 22

Density of a material

Answer 22

Density = mass/volume