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Transcript
Newton Review Use Chapters 1 & 2 in your book to help you find the answers to the questions below. 1. Write Newton’s first law. Law of Inertia: objects remain in motion, or at rest, until a force acts upon them. 2. Give an example of Newton’s first law using a rocket in your example. A rocket lifts off until gravity and air resistance stop its upward motion. 3. Write Newton’s second law in equation form. F = ma 4. What is the force in Newton’s of an object whose mass is 100 kg and accelerates at 5 m/s2? F = ma; 500 N = 100 kg x 5 m/s2. 5. What is the momentum of an object whose mass is 10 kg and has a velocity of 5 m/s? momentum = kg x m/s; 50 kg ∙ m/s = 10 kg x 5 m/s 6. Write Newton’s third law. For every action force there is an equal and opposite reaction force. 7. Give an example of Newton’s third law using a rocket. Gases expanding are an action force. Rocket lifting is a reaction force. 8. How many kilo Newtons (kN) is 10,000 Newtons? 1 kilo = 1000; 10,000 N/ 1000 = 10 kN 9. What is the mass of an object with momentum 50 kg ∙ m/s and velocity 10 m/s? momentum = kg ∙m/s; 50 kg ∙ m/s / 10 m/s = 5 kg 10. What is the acceleration of an object with force 500 N with mass 10 kg? F = ma; 500 N/ 10 kg = 50 m/s2. 11. What is the weight of an object with mass 100 kg being accelerated to Earth at a rate of 10 m/s2? F = ma; 100 kg x 10 m/s2 = 1000 N 12. What is the speed of an object that moves 200 feet in 10 seconds? Speed = Distance/ Time; 20 ft/s = 200 ft/10 s 13. What is the acceleration of an object that goes from 50 m/s to 100 m/s in 10 seconds? ∆ speed/time = acceleration; 100 m/s – 50 m/s / 10 s = 50 m/s / 10 s = 5 m/s2 Fill in the blanks for the following questions below. 14. Air resistance is a kind of _______________ friction. (fluid) 15. One Newton equals _____________. (Kg ∙ m/s2) 16. A _____________ is a push or pull. (force) 17. A ____________________ is any object that orbits another object in space.(satellite) 18. Velocity includes an objects speed and its _________________. (direction) 19. When a change in motion occurs forces are said to be __________. (unbalanced)