Get Glencoe Science: Motion, Forces, and Energy, Student Edition PDF

By McGraw-Hill Education

ISBN-10: 0078617707

ISBN-13: 9780078617706

Discover the flexibleness to educate technological know-how your approach movement, Forces, and effort, as part of the Glencoe technology 15-Book sequence, offers scholars with actual and complete insurance of forces and Newton’s legislation. The powerful content material insurance integrates a variety of hands-on reviews, critical-thinking possibilities, and real-world functions. The modular strategy enables you to mix'n'match books to fulfill your curricula.

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Additional resources for Glencoe Science: Motion, Forces, and Energy, Student Edition

Example text

To move the object, you have to exert a force large enough to break the bonds holding two surfaces together. Sliding Friction While static friction keeps an object at rest, sliding friction slows down an object that slides. If you push an object across a room, you notice the sliding friction between the bottom of the object and the floor. You have to keep pushing to overcome the force of sliding friction. Sliding friction is due to the microscopic roughness of two surfaces, as shown in Figure 5.

If momentum is conserved, the total momentum after the collision must be zero also. This means that the two objects must move in opposite directions with the same speed after the collision. Then the total momentum once again is zero. Summary Self Check Mass, Inertia, and Momentum Mass is the amount of matter in an object. Inertia is the tendency of an object to resist a change in motion. Inertia increases as the mass of an object increases. The momentum of an object in motion is related to how hard it is to stop the object, and can be calculated from the following equation: p ϭ mv Because velocity has a direction, momentum also has a direction.

Think about what happens when you try to stop someone who is rushing toward you. A small child is easy to stop. A large adult is hard to stop. The more mass an object has, the harder it is to start it moving, slow it down, speed it up, or turn it. This tendency of an object to resist a change in its motion is called inertia. Objects with more mass have more inertia, as shown in Figure 12. The more mass an object has, the harder it is to change its motion. What is inertia? ■ ■ ■ Explain the relationship between mass and inertia.

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Glencoe Science: Motion, Forces, and Energy, Student Edition by McGraw-Hill Education


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