ball and ramp for Secondary 1 Science- Physics Average Speed

Objective: Studying the overall speed in a journey

Materials:
x    1 Metal ball
x    4 Electronic stop watches
x    Metre-Rule 
x    Use the ramp to make the track inclined

1.  Set the track inclined as shown in the diagram below. Let the ball roll along the track.

Describe the motion of the ball on the track. 

Is motion constant speed?

Measure and record the time taken for the ball to travel from the start point to the 30cm,
60cm,  90cm  and  120cm  markings.  Adjust  the  inclination  if  necessary  so  that  you  can
measure the time comfortably.


Calculate the average speed of the ball from Start point to 120cm.


Set the track inclined as shown in the diagram below. Let the ball roll along the track.
1.  In your team, choose one of your team members to place a finger at the 60cm mark to stop the
rolling ball.
2.  After stopping the ball for few seconds, remove the finger and let the ball to continue rolling
along the track.
3.  Measure and record below the total time taken for the ball to travel from the start point to
120cm mark.

What is the average speed of the ball when it travels from the start point to 120cm mark?