Motion assessment

                         By Kate MacVicar, Gloryann Estrada, and Emma Thomas

Trial 1

Our first trial was 20 cm. The time it took to reach 20 cm was .30 seconds with a speed of 66.6 cm/s. We used Newton's first law of Inertia to keep the car moving after we pushed it. The action force was us pushing it and the reaction was the car's movement. The forces involved were applied force and air resistance. They were unbalanced because the car sped up, then slowed down.

Trial 2

In the second trial we had to push the car at least 40 cm. The time it took to reach 40 cm was .40 seconds with a speed of 100 cm/s. The forces involved in this video are applied force and air resistance. The forces are unbalanced because, once again, the car speeds up and slows down.

Trial 3

In this trial the car had to travel at least 60 cm. It took .57 seconds to reach that distance. The speed was 105.2 cm/s. Newton's second law was applied in this video when the car started to accelerate after it was pushed. The forces in this video were applied force and air resistance. The forces were unbalanced because the car accelerated and in the last scene it slowed down.

Trial 4

This time to car had to go 80 cm, and more force would have to be used to make it go further. It took .62 seconds to reach the distance. The speed was 129 cm/s. The forces involved were applied force and air resistance, they were unbalanced because the car didn't keep the same speed.

Trial 5: The final drive

In this trial the car had to go 100 meters. It took 1.25 seconds to reach the distance. The average speed was 80 cm/s. In this video Newton's third law was applied when we pushed the car. Pushing it was the action force and the car's movement was the reaction force. The forces in the video were applied force and air resistance, they were unbalanced because the car slowed down at the end.

Extra

1: What motion kept the golf ball moving?

2: What force was used to make the golf ball move?

3: What slowed the golf ball down?

ANSWERS

1: Inertia

2: applied force

3: friction

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