newton.pdf - Physics 102 Newtons Laws 1 The force of...

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Physics 102 - Newton’s Laws 1: The force of gravity is twice as large on a 2 kg rock as it is on a 1 kg rock. However, if both rocks are dropped to the ground, they experience the same acceleration. Explain. 2: Two constant forces of equal magnitude suddenly begin acting on a previously moving ob- ject. Under what situation would the object continue to move with the exact same velocity? Explain. 3: An elevator with a person in it is being pulled upwards by a cable. Identify all interaction forces (consistent with Newton’s 3rd Law) in the system. Specify the object the force acts on, a label for its magnitude and its direction. Consider your system to consist of the cable, the elevator, the Earth and the person. For example, the Earth pulls down on the elevator with force M elevator g and the elevator pulls up on the Earth with force M elevator g . There are four more pairs of forces (when you ignore gravitational forces that do not include the Earth). 4a: A train with a mass of 5 10 6 kg is initially traveling at 30 m/s. The conductor applies the brakes and that leads to a resistive force of 1 10 6 N acting on the train. Determine the speed of the train 30 s later and the distance it travels during that time. b: Graph x ( t ), v ( t ) and a ( t ). 5: Four forces have the same magnitudes but di erent directions as shown in the figures.
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