Edexcel a level physics

Question 1

What is the principle of conservation of energy?

Answer 1

Energy cannot be created or destroyed, only transformed from one form to another.

Question 2

True or False: Kinetic energy is given by the formula KE = 1/2 mv^2.

Answer 2

True

Question 3

Fill in the blank: The unit of power is ______.

Answer 3

Watt

Question 4

What is the formula for gravitational potential energy?

Answer 4

PE = mgh

Question 5

Multiple Choice: Which of the following is a scalar quantity? A) Velocity B) Force C) Mass D) Acceleration

Answer 5

C) Mass

Question 6

Define work in physics.

Answer 6

Work is done when a force causes an object to move in the direction of the force.

Question 7

What is the relationship between work, force, and distance?

Answer 7

Work = Force x Distance x cos(θ)

Question 8

True or False: An object in free fall experiences only gravitational force.

Answer 8

True

Question 9

Fill in the blank: The energy stored in a compressed spring is known as ______ energy.

Answer 9

elastic

Question 10

What does the term ‘efficiency’ refer to in energy transfer?

Answer 10

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

Question 11

Multiple Choice: Which energy transformation occurs in a hydroelectric power station? A) Mechanical to Electrical B) Thermal to Mechanical C) Chemical to Thermal D) Nuclear to Thermal

Answer 11

A) Mechanical to Electrical

Question 12

What is the formula for calculating efficiency?

Answer 12

Efficiency = (Useful energy output / Total energy input) x 100%

Question 13

True or False: Potential energy increases as an object is raised to a higher position.

Answer 13

True

Question 14

What is the unit of measure for work?

Answer 14

Joule

Question 15

Fill in the blank: The law of conservation of momentum states that the total momentum of a closed system ______.

Answer 15

remains constant

Question 16

What is the difference between elastic and inelastic collisions?

Answer 16

In elastic collisions, kinetic energy is conserved; in inelastic collisions, it is not.

Question 17

Multiple Choice: Which of the following is NOT a form of energy? A) Thermal B) Nuclear C) Force D) Kinetic

Answer 17

C) Force

Question 18

What is the formula for calculating kinetic energy?

Answer 18

KE = 1/2 mv^2

Question 19

True or False: A machine can create energy.

Answer 19

False

Question 20

What is the role of a transformer in an electrical circuit?

Answer 20

A transformer changes the voltage of an alternating current.

Question 21

Fill in the blank: The work-energy principle states that the work done on an object is equal to the ______ in its kinetic energy.

Answer 21

change

Question 22

Define power in the context of physics.

Answer 22

Power is the rate at which work is done or energy is transferred.

Question 23

What is the principle behind a lever?

Answer 23

A lever amplifies an input force to lift a load.

Question 24

True or False: The total mechanical energy of a system is the sum of its kinetic and potential energy.

Answer 24

True

Question 25

Multiple Choice: Which of the following types of energy is associated with motion? A) Potential B) Kinetic C) Thermal D) Chemical

Answer 25

B) Kinetic