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Answers to Chapter 12 study guide

# Answers to Chapter 12 study guide - Chapter 12 review sheet...

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Chapter 12 review sheet. Name______________________________ 1. What are the 4 kinds of friction? Static, sliding, rolling, fluid. 2. What is the SI unit for force? newton 3. What happens when an unbalanced force acts on an object? A balanced force? Unbalanced The object’s motion is changed. Balanced The object’s motion remains the same. 4. What property of matter resists change in motion? Inertia 5. What 2 forces cause a projectile to follow a curved path? The applied force and gravity. 6. What is Newton’s 2 nd law of motion? f= m●a Rearrange the formula for newton’s second law to solve for acceleration. a= f/m For mass. m=f/a 7. What is Newton’s 3 rd Law of motion? For every action there is an equal and opposite reaction. 8. In a closed system, what is conserved when 2 objects collide? Momentum 9. What is Impulse? Impulse is equal to the CHANGE in an object’s momentum. Impulse is calculated by multiplying force by time. w=mg g=9.8m/s 2 momentum= mv m 1 v 1 = m 2 v 2 10. 2 nd Law: A tow truck exerts a net horizontal force of 1060 N on 658-kilogram car. What is the acceleration of the car during this time? Show your work. a = 1.61 m/s 2 11. 2 nd Law: A small engine causes a 1.2-kg model airplane to accelerate at a rate of 5 m/s 2 . What is the net force on the model airplane? Show your work. f= 6 N

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12. A 36 kilogram canoe broke free of its dock and is now floating downriver at a speed of 2.1 m/s. What is the canoe’s momentum? Show your work. Momentum = 75.6 13. A car is traveling at a speed of 85 km/hr and has a mass of 900kg. What is the car’s momentum? Show your work. Momentum = 76,500 14. Elastic collision. A green ball with a mass of 75 grams is traveling at a speed of 2 m/s and strikes a red ball. What is the speed of the second ball? Velocity of red ball = 2 m/s 15. Inelastic collision. A bullet with a mass of 7 grams and a speed of 750 m/s is fired into a holiday jell-o mold with a mass of 2000g. What is the speed of the jell-o after the collision? Velocity of jello/bullet combo = 2.62 m/s 16. Inelastic collision. A squirrel with a mass of 250 gram travelling 10m/s jumps onto a little red wagon with a mass of 3000 grams. What is the speed of the squirrel/wagon combo? Velocity of squirrel/wagon combo = .77 m/s
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Answers to Chapter 12 study guide - Chapter 12 review sheet...

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