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Transcript
Name LESSON Date Outline Newton’s Laws Use your textbook to help you fill in the blanks. What is Newton’s first law of motion? 1. According to Newton’s first law of motion, an object at rest tends to stay at rest unless acted upon by a(n) unbalanced force. change 2. Balanced forces do not motion. an object’s 3. The tendency of a moving object to keep moving in a straight inertia line is . moving 4. If a car crashes, the passengers keep forward due to inertia. What is Newton’s second law of motion? 5. According to Newton’s second law of motion, acceleration depends on an object’s mass and the amount of net force applied to it. © McGraw-Hill Education 6. Acceleration increases if the increases. 7. Acceleration decreases if the increases. momentum 8. The object’s mass and speed. force mass of an object depends on the 9. A train has more momentum than a truck traveling at the same speed because the train has more mass Unit 4 • Forces and Motion Unit Resources . Use with Lesson 4 Newton’s Laws 4-45 LESSON Name Outline Date What is Newton’s third law of motion? 10. Newton’s third law of motion states that when one object exerts a force on another, the second object exerts a(n) equal force in the opposite direction. 11. In Newton’s third law, the first object’s force is called a(n) action force. 12. The second object’s push back on the first is known as a(n) reaction force. 13. Action-reaction forces do not cancel each other because different they act on objects. What is weightlessness? 14. Astronauts experience weightlessness because they do not seem to feel the force of gravity . 15. Objects that experience no detectable gravitational pull have true weightlessness. Critical Thinking According to Newton’s second law of motion, the acceleration of an object decreases if its mass increases. The snowball would slow down as it got bigger. Therefore, continually increased force would have to be applied to the snowball to maintain its starting speed. 4-46 Unit 4 • Forces and Motion Unit Resources Use with Lesson 4 Newton’s Laws © McGraw-Hill Education 16. A snowball rolling down a snow-covered hill gets larger and larger as it rolls. For it to maintain its starting speed, what must happen? Explain.