i. A school bus comes to a sudden stop, and all the backpacks on the noor start
ID: 1558199 • Letter: I
Question
i. A school bus comes to a sudden stop, and all the backpacks on the noor start to slide forward. What force causes them to do that? a. Gravitational Force b. Electromagnetic force c. Nuclear Force d. There is no force. 2. Estimate the net force needed to accelerate (a) 1000 kg car at 0.5g 200 g apple at the same rate. 3. What average net force is required to bring a 1500 kg car to rest from a speed of 100 km/h within a distance of 55m? 4. Calculate the sum of two forces exerted on the boat by workers A and B in figure below. FA 40.0 N 45.0 37.00 FB 30.0 N 5. A friend has given you a special gift, a box of mass 10 kg. The box is resting on the smooth (frictionless) horizontal surface of a table. (a) Determine the weight of the box and the normal force exerted on it by the table (b) Now your friend pushes down on the box with a force of 40.0 N. Again, determine the normal force exerted on the box by the table. (c) If your friend pulls upward on the box with a force of 40.0 N, what now is the normal force exerted on the box by the table?Explanation / Answer
1) d) there is no force
Backpacks move untill they are stopped by collision or by friction
2) a) Car's acceleration = 1/2 * g = 0.5 * 9.81 = 4.9 m/s2
Net force = m a = 1000 * 4.9 = 4900 N
b) 200 gm = 0.2 kg
net force = m a = 0.2 * 4.9 = 0.98 N
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