Chapter 5: Q.13b (page 128)
FIGURE EX5.13 shows an acceleration-versus-force graph for a object. What acceleration values go in the blanks on the vertical scale?
Short Answer
a.The acceleration of the object is.
Chapter 5: Q.13b (page 128)
FIGURE EX5.13 shows an acceleration-versus-force graph for a object. What acceleration values go in the blanks on the vertical scale?
a.The acceleration of the object is.
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Get started for freeA constant force is applied to an object, causing the object to accelerate at 8.0 m/s2. What will the acceleration be if
a. The force is doubled?
b. The object’s mass is doubled?
c. The force and the object’s mass are both doubled?
d. The force is doubled and the object’s mass is halved?
If a car stops suddenly, you feel “thrown forward.” We’d like to understand what happens to the passengers as a car stops. Imagine yourself sitting on a very slippery bench inside a car. This bench has no friction, no seat back, and there’s nothing for you to hold onto. a. Draw a picture and identify all of the forces acting on you as the car travels at a perfectly steady speed on level ground. b. Draw your free-body diagram. Is there a net force on you? If so, in which direction? c. Repeat parts a and b with the car slowing down. d. Describe what happens to you as the car slows down. e. Use Newton’s laws to explain why you seem to be “thrown forward” as the car stops. Is there really a force pushing you forward? f. Suppose now that the bench is not slippery. As the car slows down, you stay on the bench and don’t slide off. What force is responsible for your deceleration? In which direction does this force point? Include a free-body diagram as part of your answer.
A bag of groceries is on the seat of your car as you stop for
a stop light. The bag does not slide. Draw a motion diagram, a
force-identification diagram, and a free-body diagram for the bag.
Problems 42 through 52 describe a situation. For each, draw a motion diagram, a force-identification diagram, and a free-body diagram.
A spring-loaded gun shoots a plastic ball. The trigger has just
been pulled and the ball is starting to move down the barrel. The
barrel is horizontal.
A jet plane is speeding down the runway during takeoff. Air
resistance is not negligible. Identify the forces on the jet.
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