The purpose of this experiment is to observe the acceleration of an object caused by the Earth's gravity.
Aim: The purpose of this experiment is to observe the acceleration of an object caused by the Earth's gravity.
Introduction:
, the acceleration caused by the gravitational attraction of massive bodies in general.
, the acceleration caused by the gravitational attraction of the Earth.
, or g, the standard value of gravitational acceleration at sea level on Earth (9.80665 m/s2)
Hypothesis:
The acceleration of gravity is 9.8 m/s2 near the Earth's surface and when air resistance is negligible.
Materials:
- small, dense weight (200 g) - a dense weight will experience the least air resistance for its mass
- electric buzzer - vibrates at the same rate as the alternating current (AC) which is 60 Hz
- ticker tape
- carbon paper disk
- retort stand
- duct tape
- school bag (for soft landing)
- ruler
Method:
- Use duct tape to attach the buzzer to the retort stand so that the part where the ticker tape goes through is sticking out over the edge of the lab bench.
- Put the carbon paper disk onto the buzzer and thread the ticker tape through the guide slots on the buzzer and under the carbon paper disk. The black side of the disk should be touching the ticker tape.
- Attach the weight onto the end of the ticker tape and check that the weight can fall freely, pulling the ticker tape smoothly through the buzzer.
- Put something soft (school bag) on the floor where the weight will fall.
- Hold the weight close to the buzzer, turn on the buzzer and immediately drop the weight. As the weight falls, the buzzer should make a series of dots on the ticker tape. Examine the tape to make sure the sequence of dots is clear and continuous.
- Repeat step 5 for each member of the team.
- Mark every 6 dots on the ticker tape (representing 6/60 = 0.1 s). Measure the distance travelled in each 0.1 s interval.
- Safety concerns: Make all adjustments to the buzzer BEFORE plugging it in. Make sure the weight falls onto something soft (NOT a person) so that the weight and floor are not damaged.