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2 November, 11:21

Jessica's weight is 540 newtons. According to the Third Law, if the Earth pulls on Jessica with a force of 540 N, then Jessica pulls on the Earth with a force of 540 newtons that acts in the opposite direction. However, if Jessica stumbles while rollerblading, she will fall down to the ground. Explain why this happens.

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  1. 2 November, 12:12
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    She's been acted on by an outside force. Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. As Newton's third law states that for every external force that acts on an object there is a force of equal magnitude but opposite direction which acts back on the object which exerted that external force. As Jessica has been acted upon by a force that caused her to stumble, the forces will become unbalanced and therefore cause her to fall.
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