## Wednesday, 1 February 2017

### Ball Bearing lab

The Effect of Gravity on Speed

Introduction
Gravity provides a constant acceleration (force) on an object. The effect is changed by using ramps at different angles. In this lab, you will find the optimal angle to maximize acceleration on a ball bearing so it travels the farthest and/or the fastest. Friction is the opposing force created by the surface interactions. Whenever something rolls due to a force, friction will oppose this force and slow it down.

Equipment needed:
Timer Ramp Ball Bearing
Graph Paper (2) Ruler

Procedure:
1. Put the ramp against the seat of a chair. Place the ramp and chair so that the ramp points towards the hallway. Have your teammate on the other end of the hallway.
2. Place the ball bearing at the top of the ramp.
3. Lift the ramp 20 cm and release the ball bearing
4. Time how long it takes to travel 5 meters.
5. See how far it will go..
6. Repeat the experiment three times for each height then do 40 cm, 60 cm, and 80 cm.

 Height Time to travel 5 meters Distance travelled 20 20 20 40 40 40 60 60 60 80 80 80

Observations:

The ball released from higher ramp travel faster and further. The ball release at height 80 cm went faster than and further than 20 cm.

1. Describe how the ball rolls off the ramp at each height—discuss the effect of bouncing or other               factors ?

Answer : The ball roll off at higher position went faster and longer distance than lower height. The result of the height of the ramp cause more acceleration of the ball

2. Discuss what is the fastest speed reached and any factors that could improve this ?

Answer : The ball with fastest speed was the one at highest angle. To improve speed, we need to change the angle higher.

3. Does the ball travel in a straight line, why or why not ?

Answer : Yes, because of the surface was smooth and does not cause friction between ball and ramp