AP Physics 1- Work, Energy, & Power Practice Problems ...

AP Physics 1- work , energy , & Power Practice Problems ANSWERS FACT: The amount of work done by a steady force is the amount of force multiplied by the distance an object moves parallel to that force: W = F x cos ( ). The units are , which equal a Joule (J). Positive work is done by a force parallel to an object s displacement. Negative work is done by a force antiparallel to an object s displacement. work is a scalar quantity so it can be positive or negative, but does not have a direction. The area under a force vs. displacement graph is work . Q1. A friend s car is stuck on the ice. You push down on the car to provide more friction for the tires (by way of increasing the normal force), allowing the car s tires to propel it forward 5 meters onto the less slippery ground. How much work do you do? (0) Q2. You push a crate up a ramp with a force of 10 N. Despite your pushing, the crate slides down the ramp 4 m. How much work did you do? (-40J) Q3. How much work is done in lifting an 8-kg box from the floor to a height of 2m above the floor?

The diagram below represents a 155 N box on a ramp. Applied force F causes the box to slide from point A to point B. What is the total amount of gravitational energy gained by the box? (279J) FACT: A “conservative” force (e.g., gravity, spring) converts potential energy to other forms of mechanical energy when it does work.

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  Practices, Power, Points, Energy, Problem, Work, Slides, Amp power practice problems

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