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Intro Physics

Chapter 6

Study Guide

Use your textbook to define the following terms (You may use the space below or notebook paper):

Section 6.1

  1. Work-

Concept Check

  1. How much work is needed to lift an object that weighs 500 N to a height of 4 m?
  2. How much work is needed to lift it twice as high?
  3. How much work is needed to lift a 1000 N object to a height of 8 m?

Section 6.2

  1. Power-
  1. Watt-

Concept Check

  1. You do work when you do push-ups. If you do the same number of push-ups in half the time, how does your power output compare?
  2. How many watts of power are needed when a force of 1 N moves a book 2 m in a time of 1 s?

Section 6.3

  1. Energy-
  1. Potential Energy-
  1. Kinetic Energy-

Concept Check

  1. She pushes the block five times farther up the incline than the man lifts it to the same height. How much more force does the man exert when he lifts the ice?
  2. Who does more work on the ice?
  3. If both jobs are done in the same time, who expends more power? (Pg. 86)

Section 6.4

  1. Gravitational Potential Energy-

8. PE=

Concept Check

  1. How much work is done in lifting the 200-N block of ice shown in Figure 6.9 a vertical distance of 2.5 m?
  2. How much work is done in pushing the same block of ice up the 5-m long ramp? The force needed is only 100 N (which is why inclines are used.)
  3. What is the increase in the blocks potential energy in each case.

Section 6.5

Kinetic Energy-

Concept Check

  1. A car travels at 30 km/h and has kinetic energy of 1 MJ. If it travels twice as fast, 60 km/h, how much kinetic energy will it have?
  2. If it travels three times as fast, 90 km/h, what will be its kinetic energy?
  3. If it travels four times as fast, at 1220 km/h, what will be its kinetic energy?

Section 6.6

Work-Energy Theorem- The change in potential energy is equal to the change in kinetic energy which is equal to the work done.

Work-

Concept Check

  1. When the brakes of a car are locked, the car skids to a stop. How much farther will the car skid if it’s moving 3 times as fast?
  2. Can an object have energy?
  3. Can an object have work?

Section 6.7

Conservation of Energy-

Concept Check

  1. Does an automobile consume more fuel when its air conditioner is turned on? When its lights are on? When its radio is on while the auto is sitting in the parking lot?
  2. Rows of wind powered generators are used in various windy locations to generate electric power. Does the power generated affect the speed of the wind? Would locations behind the “windmills” be windier if they weren’t there?

Section 6.8 Not included on test

Section 6.10 Sources of Energy

Name four sources of energy:

There is more Chapter 6 Review if needed on pages 98-101.