FREE FALL

The diagram shows a coin, marble, and dried leaf being released at the same time in a vacuum cylinder. Which observation is correct?

• All three objects float in the cylinder

• All three objects reach the base at the same time

• The marble reaches the base earlier than the coin

• The coin and the marble reach the base earlier than the dried leaf

An iron ball is dropped from a height of 10 m above the surface of the Moon. Calculate the time taken for the iron ball to reach the surface of the Moon. [Moon gravitational acceleration = [1/6 of Earth Gravitational acceleration].

• 0.6 s

• 1.4 s

• 3.5 s

• 12.0 s

A brick falls from a height of 10 m.

Calculate the time taken for the brick to reach the ground.

• 0.5 s

• 0.7 s

• 1.0 s

• 1.4 s

Diagram 5 shows a stroboscopic photograph of a ball dropped from a height.

• velocity

• acceleration

• kinetic energy

• gravitational potential energy

Diagram 7 shows a feather and a stone falling freely in a vacuum. Which statement is correct about the motion?

• The feather and the stone fall with constant velocity

• The feather and the stone have the same kinetic energy

• The feather and the stone reach the ground at the same time

• The gravitational force acting on the feather and the stone are the same

Diagram 5 shows a stone is thrown vertically upwards at a velocity of 20 ms^-1. What is the maximum height achieved by the stone?

• 2 m

• 19 m

• 20 m

• 40 m

A meteor that is moving at a speed of 100 ms^-1 towards Mars is detected at a height of 207.2 m from its surface. The meteor reaches the surface of Mars after 2 s. What is the gravitional acceleration of Mars?

• 0.90 ms^-2

• 3.60 ms^-2

• 53.55 ms^-2

• 103.60 ms^-2

Diagram 3 shows two trolleys of different masses.

Both trolleys move at the same velocity and fall over the edge of the table and hit the floor. What is the same physics quantity for both trolleys?

• Gravitational potential energy

• Time taken to hit the floor

• Kinetic energy

• Momentum

Diagram 4 shows a PVC vacuum tube is erected vertically. Three identical spheres made off cork, c, rubber, r and steel, s are dropped through the tube. The time, t, taken to reach the base of the tube is recorded as t_c, t_r and t_s respectively.

• t_s > t_r > t_c

• t_c > t_r > t_s

• t_r > t_s > t_c,

• t_s = t_r = t_c,

Diagram 6 shows a mango falling from a tree.

Which acceleration-time graph represents the motion of the mango?

• 
• 
• 
•