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# sol06 - from the scale drawing The size(as measured with a...

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PHYSICS 103 Chapter 3 -- HW #6 Questions 2. As the keys leave your pocket they are also moving sideways at 400 m/s and, by Newton’s first law, they keep moving sideways at 400 m/s while they fall to the floor. 6. Because the velocity of the motorcycle does not change, Newton’s first law tells us that the forces acting on the motorcycle must add to zero; that is the net force must be zero. Exercises 2. Each part of this exercise must be solved using a scale drawing. a) If the two forces point in the same direction, the sizes add: 12 N + 5 N = 17 N b) If the two forces point in opposite directions, the sizes subtract: 12 N - 5 N = 7 N (This force acts in the direction of the 12-N force.) c) When the two forces act at right angles to each other, we can get the size and direction
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Unformatted text preview: from the scale drawing. The size (as measured with a ruler) is 13 N and the direction (as measured with a protractor) is 23 degrees from the 12-N force. 4. This exercise msut be solved using a scale drawing. In this case you need to find the force that is needed to connect the tip of the second arrow to the tail of the first. As shown in the diagram, the three forces form a closed figure. This means that the total (or net) force is zero. Note that this force is equal in magnitude and opposite in direction to the sum of the first two forces. The magnitude of this force (as measured with a ruler) is 5 N and its angle (as measured with a protractor) is 37 degrees east of north....
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