Igcse physics formulas

Question 1

Define speed.

Answer 1

The distance traveled per unit of time.

Question 2

What is the formula for speed?

Answer 2

Speed = Distance / Time

Question 3

True or false: Velocity includes direction.

Answer 3

TRUE

Velocity is a vector quantity, unlike speed.

Question 4

Fill in the blank: Acceleration is the rate of change of ______.

Answer 4

Velocity

Question 5

What is the formula for acceleration?

Answer 5

Acceleration = (Final Velocity - Initial Velocity) / Time

Question 6

Define force.

Answer 6

An interaction that causes an object to change its motion.

Question 7

What is the formula for force?

Answer 7

Force = Mass x Acceleration

Question 8

True or false: Weight is the force of gravity on an object.

Answer 8

TRUE

Weight is calculated as Weight = Mass x Gravitational Field Strength.

Question 9

Fill in the blank: Work is done when a force causes ______.

Answer 9

Displacement

Question 10

What is the formula for work?

Answer 10

Work = Force x Distance x cos(θ)

Question 11

Define energy.

Answer 11

The capacity to do work.

Question 12

What is the formula for kinetic energy?

Answer 12

Kinetic Energy = 0.5 x Mass x Velocity^2

Question 13

What is the formula for potential energy?

Answer 13

Potential Energy = Mass x Gravitational Field Strength x Height

Question 14

True or false: Power is the rate of doing work.

Answer 14

TRUE

Power = Work / Time.

Question 15

What is the formula for power?

Answer 15

Power = Work / Time

Question 16

Define momentum.

Answer 16

The product of an object’s mass and its velocity.

Question 17

What is the formula for momentum?

Answer 17

Momentum = Mass x Velocity

Question 18

Fill in the blank: Pressure is force per unit ______.

Answer 18

Area

Question 19

What is the formula for pressure?

Answer 19

Pressure = Force / Area

Question 20

Define density.

Answer 20

Mass per unit volume of a substance.

Question 21

What is the formula for density?

Answer 21

Density = Mass / Volume

Question 22

True or false: Temperature is a measure of thermal energy.

Answer 22

FALSE

Temperature measures the average kinetic energy of particles.

Question 23

What is the formula for thermal energy?

Answer 23

Thermal Energy = Mass x Specific Heat Capacity x Temperature Change

Question 24

Define wave speed.

Answer 24

The speed at which a wave travels through a medium.

Question 25

What is the formula for **wave speed**?

Answer 25

Wave Speed = Frequency x Wavelength

Question 26

Fill in the blank: **Frequency** is the number of waves passing a point per ______.

Answer 26

Second

Question 27

What is the formula for **frequency**?

Answer 27

Frequency = 1 / Period

Question 28

Define **electric current**.

Answer 28

The flow of electric charge in a circuit.

Question 29

What is the formula for **current**?

Answer 29

Current = Charge / Time

Question 30

True or false: **Voltage** is the energy per unit charge.

Answer 30

TRUE ## Footnote Voltage = Energy / Charge.

Question 31

What is the formula for **voltage**?

Answer 31

Voltage = Energy / Charge

Question 32

Define **resistance**.

Answer 32

Opposition to the flow of electric current.

Question 33

What is the formula for **resistance**?

Answer 33

Resistance = Voltage / Current

Question 34

Fill in the blank: **Ohm's Law** states that voltage equals current times ______.

Answer 34

Resistance

Question 35

What is the formula for **Ohm's Law**?

Answer 35

Voltage = Current x Resistance

Question 36

Define **magnetic field**.

Answer 36

A region around a magnet where magnetic forces can be detected.

Question 37

What is the formula for **magnetic force**?

Answer 37

Magnetic Force = Charge x Velocity x Magnetic Field Strength

Question 38

True or false: **Friction** always opposes motion.

Answer 38

TRUE ## Footnote Friction acts in the opposite direction to the movement.

Question 39

What is the formula for **frictional force**?

Answer 39

Frictional Force = Coefficient of Friction x Normal Force

Question 40

Define **moment**.

Answer 40

The turning effect of a force about a pivot.

Question 41

What is the formula for **moment**?

Answer 41

Moment = Force x Distance from Pivot

Question 42

Fill in the blank: **Refraction** is the bending of light as it passes from one ______ to another.

Answer 42

Medium

Question 43

What is the formula for **index of refraction**?

Answer 43

Index of Refraction = Speed of Light in Vacuum / Speed of Light in Medium

Question 44

Define **thermal conductivity**.

Answer 44

The ability of a material to conduct heat.

Question 45

What is the formula for **thermal conductivity**?

Answer 45

Thermal Conductivity = Heat Transfer / (Area x Temperature Gradient)

Question 46

True or false: **Conduction** occurs in fluids.

Answer 46

FALSE ## Footnote Conduction primarily occurs in solids.

Question 47

What is the formula for **specific heat capacity**?

Answer 47

Specific Heat Capacity = Heat Energy / (Mass x Temperature Change)