Multiple choice

A girl riding on a skateboard at 3 m/s suddenly hits the curb. The girl will fall:

  1. backward with a speed greater than 3 m/s.

  2. backward at a speed equal to 3 m/s.

  3. forward with a speed greater than 3 m/s.

  4. forward at a speed equal to 3 m/s.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to Newton's First Law of Motion (the law of inertia), an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force. When the skateboard is abruptly stopped by the curb, the girl's body continues moving forward at her original speed of 3 m/s.

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