A-Level Physics Mechanics

Question 1

A ball is thrown vertically upwards with an initial velocity of 20 m/s. Taking g = 9.8 m/s², what is the maximum height reached?

Accepted Answer

20.4 m

Answer

40.8 m

Answer

10.2 m

Answer

2.04 m

Question 2

Newton's third law states that when object A exerts a force on object B, object B exerts an equal and opposite force on A. Which of the following is a correct Newton's third law pair?

Accepted Answer

The gravitational pull of the Earth on a book and the gravitational pull of the book on the Earth

Answer

The weight of a book on a table and the normal contact force from the table

Answer

The tension in a rope and the weight of the hanging object

Answer

The driving force of a car and the friction opposing it

Question 3

A 2 kg object is accelerated from rest to 10 m/s in 4 seconds. What is the resultant force acting on it?

Accepted Answer

5 N

Answer

20 N

Answer

10 N

Answer

2.5 N

Question 4

A projectile is launched horizontally at 15 m/s from a cliff 80 m high. How long does it take to hit the ground? (g = 10 m/s²)

Accepted Answer

4 s

Answer

2 s

Answer

5.3 s

Answer

8 s

Question 5

What is the moment of a 60 N force applied at 0.8 m from a pivot, at an angle of 30° to the lever arm?

Accepted Answer

24 N m

Answer

48 N m

Answer

41.6 N m

Answer

60 N m

Question 6

A car of mass 1200 kg travels at 30 m/s. What is its kinetic energy?

Accepted Answer

540 kJ

Answer

36 kJ

Answer

18 kJ

Answer

1080 kJ