Materials:

- A feather

- A hammer

- A tall building or other elevated location

Procedure:

1. Stand at the top of the building or other elevated location.

2. Hold the feather and the hammer in your hand, with the feather in one hand and the hammer in the other.

3. Drop both objects at the same time.

Observations:

You will observe that the hammer falls much faster than the feather. This is because the air exerts more resistance on the feather than on the hammer.

Conclusion:

The difference in the falling speeds of the feather and the hammer demonstrates that air has resistance.

Experiment 2: Parachute

Materials:

- A piece of cloth

- A weight (such as a rock or a ball)

- A string

Procedure:

1. Cut the piece of cloth into a square shape.

2. Attach the weight to one end of the string.

3. Tie the other end of the string to the center of the cloth.

4. Hold the parachute (the cloth with the weight attached) in your hand.

5. Drop the parachute from a height.

Observations:

You will observe that the parachute falls more slowly than the weight without a parachute. This is because the air exerts resistance on the parachute, which slows down its fall.

Conclusion:

The fact that the parachute falls more slowly than the weight without a parachute demonstrates that air has resistance.