A-Level H2 Physics

Question 1

A ball is thrown horizontally from a height of 20m. Taking g = 10 m/s², how long does it take to reach the ground?

Accepted Answer

2s

Answer

Using h = ½gt²: 20 = ½×10×t². t² = 4. t = 2s. Horizontal motion is independent of vertical free fall.

Question 2

What is the work-energy theorem?

Accepted Answer

The net work done on an object equals its change in kinetic energy

Answer

The work-energy theorem states that the net work done on an object equals its change in kinetic energy: W_net = ΔKE = ½mv² - ½mu².

Question 3

State Newton's Third Law of Motion.

Accepted Answer

Every action has an equal and opposite reaction acting on different objects

Answer

Newton's Third Law: for every action force, there is an equal and opposite reaction force, acting on DIFFERENT objects. The forces are equal in magnitude but act on different bodies.

Question 4

A spring with spring constant k = 200 N/m is compressed by 0.05 m. What is the elastic potential energy stored?

Accepted Answer

0.25 J

Answer

E = ½kx² = ½ × 200 × (0.05)² = 100 × 0.0025 = 0.25 J.

Question 5

What is the principle of superposition of waves?

Accepted Answer

When two waves meet, the resultant displacement is the vector sum of individual displacements

Answer

The principle of superposition states that when two or more waves overlap, the resultant displacement at any point is the algebraic (vector) sum of the individual displacements.

GCE A-Level Practice Test

GCE A-Level Practice Test

A-Level H2 Physics