Problem of the Week Pool Pockets

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Name Class Date Assessment Pretest Work and Energy 1. What is the difference between speed and velocity? ______ 2. Which of the following objects is not accelerating? a. the space shuttle as it is orbiting Earth b. a car turning a corner c. the space shuttle when it is being launched d. a bike moving in a straight line at a constant speed 3. If you triple the net force acting on a moving object, how will its acceleration be affected? ______ 4. The gravitational force between two objects depends on which of the following? a. each object’s mass c. the distance between the objects b. each object’s volume d. both (a) and (c) 5. What happens to an object’s motion in each of the following cases? a. an unbalanced force acts on it b. two unequal forces act on it in opposite directions c. two equal forces act on it in opposite directions 6. What information is needed to calculate an object’s weight? 7. Which has more momentum when traveling at 15 m/s, a baseball or a golf ball? Which has more energy? 8. Which has more momentum, a baseball traveling at 4 m/s or a baseball traveling at 16 m/s? Which has more energy? Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt Science Spectrum 38 Work and Energy TEACHER RESOURCE PAGE INTEGRATING BIOLOGY: MUSCLES AND WORK they can easily and repeatedly store energy from other sources. 3. Each energy source has drawbacks. The gasoline-powered engines create pollution, and the battery-powered engines cannot produce enough energy to power the car for long periods of time. 1. Anaerobic exercise 2. Aerobic exercise is best for the heart and lungs because they get exercise by providing the muscles with oxygen. 3. a. doing a running long jump: anaerobic b. running the 100 m dash: anaerobic c. running a marathon: aerobic d. doing push-ups: resistance REAL WORLD APPLICATIONS: CALORIES AND NUTRITION 1. 4.39 ϫ

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