Key Concepts Of Physics

Question 1

What is the formula for calculating speed?

Answer 1

Speed = Distance / Time

Question 2

Fill in the blank: The unit of force is _______.

Answer 2

Newton

Question 3

What is the law of conservation of energy?

Answer 3

Energy cannot be created or destroyed, only transformed.

Question 4

Which of the following is a vector quantity? A) Mass B) Speed C) Velocity D) Temperature

Answer 4

C) Velocity

Question 5

What is the gravitational force on Earth approximately equal to?

Answer 5

10

Question 6

What is the difference between mass and weight?

Answer 6

Mass is the amount of matter in an object; weight is the force exerted by gravity on that mass.

Question 7

True or False: An object in motion will stay in motion unless acted upon by an external force.

Answer 7

True

Question 8

Fill in the blank: The device that measures temperature is called a _______.

Answer 8

Thermometer

Question 9

What is the formula for calculating kinetic energy?

Answer 9

Kinetic Energy = 1/2 * mass * velocity²

Question 10

What is the principle of moments?

Answer 10

For a system in equilibrium, the sum of clockwise moments about a pivot equals the sum of anti-clockwise moments.

Question 11

Which type of energy is stored in a compressed spring?

Answer 11

Elastic potential energy

Question 12

What is the SI unit of power?

Answer 12

Watt

Question 13

What does the term ‘efficiency’ mean in physics?

Answer 13

Efficiency is the ratio of useful energy output to total energy input, usually expressed as a percentage.

Question 14

Fill in the blank: The force of gravity between two objects depends on their _______ and the distance between them.

Answer 14

Masses

Question 15

What is the definition of work done?

Answer 15

Work done is the energy transferred when a force moves an object over a distance.

Question 16

True or False: A conductor allows electric current to flow easily.

Answer 16

True

Question 17

What is Ohm’s Law?

Answer 17

Voltage = Current × Resistance

Question 18

What is the difference between series and parallel circuits?

Answer 18

In a series circuit, components are connected end-to-end; in a parallel circuit, components are connected across common points.

Question 19

Fill in the blank: The energy stored in a battery is known as _______ energy.

Answer 19

Chemical

Question 20

Which type of wave requires a medium to travel through?

Answer 20

Mechanical wave

Question 21

What is the frequency of a wave?

Answer 21

The number of waves that pass a point in one second.

Question 22

True or False: Sound travels faster in air than in water.

Answer 22

False

Question 23

What is the formula for calculating gravitational potential energy?

Answer 23

Gravitational Potential Energy = mass × gravitational field strength × height

Question 24

What is meant by ‘thermal conduction’?

Answer 24

The transfer of heat through a material without the movement of the material itself.

Question 25

Fill in the blank: The process of changing from a liquid to a gas is called _______.

Answer 25

Evaporation