1. In each situation, identify the forces and specify whether the work done by the respective forces is positive, negative or zero. Example: A ball rolls down an inclined plane. Answers: 1) weight of the ball positive 2) Normal force : zero 3) Frictional force : negative a. A physics student stretches a spring. b. A projectile falls toward the surface of Earth. c. A box is pulled across a rough floor at constant velocity. d. A child pulls a toy across a rough surface causing it to accelerate.
1. In each situation, identify the forces and specify whether the work done by the respective forces is positive, negative or zero. Example: A ball rolls down an inclined plane. Answers: 1) weight of the ball positive 2) Normal force : zero 3) Frictional force : negative a. A physics student stretches a spring. b. A projectile falls toward the surface of Earth. c. A box is pulled across a rough floor at constant velocity. d. A child pulls a toy across a rough surface causing it to accelerate.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter5: Energy
Section: Chapter Questions
Problem 5P: Starting from rest, a 5.00-kg block slides 2.50 m down a rough 30.0 incline. The coefficient of...
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