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Chapter 4: Q3. (page 98)
If the object is moving, it is possible for the net force acting on it to be zero? Explain.
Yes, when the object is moving with a constant velocity, the net force on it must be zero.
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Suppose an object is accelerated by a force of 100 N. Suddenly, a second force of 100 N in the opposite direction is exerted on the object so that the forces cancel. The object
(a) is brought to rest rapidly.
(b) decelerates gradually to rest.
(c) continues at the velocity it had before the second force was applied.
(d) is brought to rest, and then it accelerates in the direction of the second force.
A box rests on the (frictionless) bed of a truck. The truck driver starts the truck and accelerates forward. The box immediately starts to slide towards the rear of the truck bed. Discuss the motion of the box, in terms of Newton鈥檚 laws, as seen (a) by Mary standing on the ground besides the truck, and (b) by Chris who is riding on the truck (See below figure).
(a) A box sits at rest on a rough 33掳 inclined plane. Draw the free-body diagram, showing all the forces acting on the box. (b) How would the diagram change if the box were sliding down the plane? (c) How would it change if the box were sliding up the plane after an initial shove?
A person pushes a 14.0-kg lawn mower at constant speed with a force ofdirected along the handle, which is at an angle of 45.0掳 to the horizontal (Fig. 4鈥�58). (a) Draw the free-body diagram showing all forces acting on the mower. Calculate (b) the horizontal friction force on the mower, then (c) the normal force exerted vertically upward on the mower by the ground. (d) What force must the person exert on the lawn mower to accelerate it from rest to 1.5 m/s in 2.5 seconds, assuming the same friction force?
FIGURE 4-58 Problem 50.
The normal force on an extreme skier descending a very steep slope (Fig. 4鈥�42) can be zero if
(a) his speed is great enough.
(b) he leaves the slope (no longer touches the snow).
(c) the slope is greater than 75掳.
(d) the slope is vertical (90掳).
FIGURE 4-42 Mis鈥揅onceptual Question 12.
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