Question

Write a hypothesis about the effect of the racetrack’s height on the speed of the car using the format of "if…then…because….” Be sure to answer the lesson question "How can motion be described?”

Answer 1

Sample Response: If the starting height of a sloped racetrack is increased, then the speed at which a toy car travels along the track will increase because the toy car will have a greater acceleration.

Answer 2

Answer:

Hypothesis about the effect of the racetrack's height on the speed of the car:

• Let's take three racetracks
• The length of each racetrack is 36 inches, i.e., 0.91 m.
• The height of the first racetrack is 8 inches i.e., 0.2 m; the second racetrack is 16 inches i.e., 0.41 m and the third racetrack is 24 inches i.e., 0.61 m.
• The time taken by the car for each lap on the first track is 7.8 seconds; on the second racetrack is 7.3 seconds, and on the third racetrack is 6.6 seconds.
• Now you can see that less time is taken by the car on 24 inches, i.e., 0.61 m high racetrack. It shows that higher will be the track, faster will be the velocity and less will be time taken.
• Because the velocity on slanted racetrack depends on the gravity and the other circumstances.

So the conclusion is that for higher velocity, height of the racetrack should be high.

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