Worksheet Chapter 2: Force and Motion I

1. A trolley A of mass 3 kg moving right at 5 m s⁻¹ collides head-on with trolley B of mass 2 kg moving left at 2 m s⁻¹. After collision, trolley A moves right at 1 m s⁻¹. Calculate the velocity and direction of trolley B after collision.

2. A sprinter accelerates from rest at 3.0 m s⁻² for 4 seconds. Calculate (a) the final velocity reached, and (b) the distance covered during this time.

3. Explain using physics principles why soft landing mats are essential in pole-vaulting events.

4. Fill in the blank: The rate of change of momentum is directly proportional to the applied force and acts in the direction of the force, according to Newton's ________ Law of Motion.

5. A ball is released from rest from the top of a building 45 m tall. Assuming free fall with g = 9.81 m s⁻² and neglecting air resistance, calculate the time taken for the ball to reach the ground.

6. True or False: An object with a larger mass has less inertia than an object with a smaller mass.

7. True or False: Kinetic energy is conserved in both elastic and inelastic collisions.

8. A bullet of mass 0.02 kg is fired horizontally from a rifle of mass 4.0 kg at a velocity of 300 m s⁻¹. Calculate the recoil velocity of the rifle.