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The Forces Game

The Forces Game. Lots of fun! Win valuable prizes!. Topics on Friday’s test. Chapter 4, all sections Chapter 7, sections 1 & 2 Force Free-body diagrams Newton’s three laws of motion, incl. F = ma Finding net force Friction Coefficient of friction Centripetal acceleration

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The Forces Game

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  1. The Forces Game Lots of fun! Win valuable prizes!

  2. Topics on Friday’s test • Chapter 4, all sections • Chapter 7, sections 1 & 2 • Force • Free-body diagrams • Newton’s three laws of motion, incl. F = ma • Finding net force • Friction • Coefficient of friction • Centripetal acceleration • Centripetal force • Universal gravitation

  3. What is the weight of a 108-kg football player?

  4. 2. As a ball falls, the action force is the pull of the Earth on the ball. What is the reaction to this force? • The pull of the ball on the Earth • Air resistance acting against the ball • The acceleration of the ball • Nonexistent in this case • none of the above

  5. 3. A 75-kg astronaut weighs 662 N on the surface of Venus. What is the acceleration of gravity on Venus?

  6. 4. Draw a free-body diagram of a car accelerating to the left on a level road. Neglect friction.

  7. 5. After a cannonball is fired into frictionless space, the amount of force needed to keep it going equals • zero, since no force is necessary to keep it moving. • twice the force with which it was fired. • one half the force with which it was fired. • the same amount of force with which it was fired. • one quarter the force with which it was fired.

  8. 6. A 15-N force and a 32-N force act on an object toward the right. A 18-N force acts on the same object toward the left. The object weighs 2.5 N and is supported by a horizontal surface. What is the magnitude and direction of the net force on the object?

  9. 7. A model rocket has a mass of 1.47 kg. At launch the rocket’s engine exerts an upward force of 40.2 N. What is the acceleration of the rocket?

  10. 8. An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass? • The one on Earth • The one on the moon • They have the same mass. • Not enough information to say

  11. 9. A 25-kg crate is pulled across the ice with a rope. A horizontal force of 62 N is applied to the rope. If the coefficient of kinetic friction between the crate and the ice is 0.09, what is the acceleration of the crate?

  12. 10. What is the gravitational force acting on a 7.5 x 108-kg oil tanker due to a 4.4 x 109-kg iceberg floating 672 m away?

  13. 11. A car travels in a circle with constant speed. The net force on the car • is directed forward, in the direction of travel. • is zero because the car is not accelerating • is directed toward the center of the curve. • none of the above

  14. 12. An airplane is flying in a horizontal circle of radius 1,500 m with a speed of 125 m/s. What is the magnitude of the centripetal acceleration of the plane?

  15. 13. Wile E. Coyote is chasing the Roadrunner while coasting on roller skates at 21 m/s. He lights a rocket on his back, which boosts his velocity to 98 m/s before it burns out 5.5 seconds later. If Wile E. and his gear have a combined mass of 68 kg, what was the average force exerted by the rocket?

  16. Bonus question time!

  17. 10. An object weighs 20 N on the earth's surface. What is the weight of the object on a planet that has twice the earth's mass and four times the earth's radius?

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