Physics Fundamentals
Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 4, Problem 2Q
To determine

The force responsible for the forward motion of a person who is thrown forward when brakes are applied suddenly to the car.

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Two people are pushing a truck across a parking lot. The truck has a mass of about 2 × 10 kg. First, they take turns pushing. When Person A pushes the truck, the truck accelerates at a rate of 1 m/s?. When Person B pushes the truck, it accelerates at a rate of 2 m/s?(a) Both people stand behind the truck and push in the same direction. What is the net force on the truck? At what rate will the truck accelerate?(b) Person A stands at the back of the truck and Person B stands at the front, and they push in opposite directions. What is the net force on the truck? At what rate will the truck accelerate? In what direction?For both (a) and (b), draw a picture indicating the forces applied by A and B as well as the motion of the truck.
Two people are pushing a truck across a parking lot. The truck has a mass of about 2 × 103 kg. First, they take turns pushing. When Person A pushes the truck, the truck accelerates at a rate of 1 m/s2. When Person B pushes the truck, it accelerates at a rate of 2 m/s?. (a) Both people stand behind the truck and push in the same direction. What is the net force on the truck? At what rate will the truck accelerate? (b) Person A stands at the back of the truck and Person B stands at the front, and they push in opposite directions. What is the net force on the truck? At what rate will the truck accelerate? In what direction? For both (a) and (b), draw a picture indicating the forces applied by A and B as well as the motion of the truck.
A 2150-kg truck is traveling along a straight, level road at a constant speed of 55.0 km/h when the driver removes his foot from the accelerator. After 21.0 s, the truck's speed is 33.0 km/h. What is the magnitude of the average net force acting on the truck during the 21.0 s interval?
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