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Transcript
Midterm Review 2 Scalar or Vector Distance Mass Force Time Momentum Speed Displacement Velocity Acceleration 1D Motion & Free-fall 1. A racecar accelerates from 10 m/s at a rate of 8 m/s2 for 6.7 seconds. What distance does it cover? 246.6 m Don’t forget how to get those hidden given variables. 2. A train traveling at 30 m/s comes to a stop over a distance of 1200 m. What is the magnitude of its acceleration? What is its final velocity? -0.375 m/s2 3. A snowball is dropped from the roof of a 12 m tall building. How fast is it moving when it hits the ground? What is its initial velocity? What is its acceleration? 15.3 m/s 4. A ball is thrown upwards with an initial velocity of 17 m/s. What height does it reach? What is its final velocity? What is its acceleration? 14.7 m How does mass or weight effect free-fall? 5. Mr. Evans drops a 1 kg snowball onto a passing student and Mr. Vigneaux drops a 2 kg snowball onto a failing student. Whose student will be pummeled with snow first? Same time Vectors 6. A 7 Newton force and a 6 Newton force act concurrently on a point. What will their minimum and maximum resultants be? At what angles will those occur? 1 N, 180 degrees 13 N, 0 degrees 7. a. b. c. What happens to a resultant force as the angle between two forces goes from: 0-90 degrees? Decrease (further from zero) 90-180 degrees? Decrease (further from zero) 45-35 degrees? Increase (closer to zero) 8. Using a metric ruler, use the tip-to-tail method to draw the resultant vector from adding A and B. 9. Sketch the equilibrant – the vector that will bring these vectors back to equilibrium for each 10. Sketch the resultant for each Projectile Motion How does horizontal velocity affect vertical motion? 11. A cannon fires a cannonball at 200 m/s off a 60 m cliff. A person drops a cannonball at the same time. Which hits the ground first? Same tim Multi-part projectile motion problems will typically follow a logical order 12. A cannon fires a projectile with an initial velocity of 80 m/s at an angle of 35 degrees. a. What is the initial vertical velocity of the projectile? 45.9 m/s b. What height will the projectile reach? 107.4 m 13. A plane traveling at 150 m/s drops a care package. Twelve seconds later it hits the ground. a. What is its initial velocity in the horizontal? 150 m/s b. What horizontal range did the package travel? 1800 m Graphing Motion Remember DVA Newton’s Laws & Forces 14. A 2000 kg car traveling at 30 m/s crashes into a pole. The pole stops the car with a force of 6 x 105 N for 0.10 seconds. What force does the car impart onto the pole? 6 x 105 N 15. A 40 N force pushes a 10 kg wagon with constant velocity. What is the force of friction acting on the wagon? 40 N 16. A 50 N force pushes a 10 kg wagon which accelerates at 2 m/s2. a. What is the net force on the wagon? 20 N b. What is the force of friction slowing the wagon? 30 N 17. As shown in the diagram, 2 forces F1 and F2=200 N act on a 25 kg object. If the object accelerates at a rate of 5 m/s2, and F2 is 200 N, what is F1? 75 N 18. A 90 kg man on an elevator is moving upwards at constant velocity. What upward normal force is the floor providing to the man? 882 N 19. A 90 kg man is on an elevator accelerating upwards at 1.2 m/s2. a. What is the net force acting on the man? 108 N b. Is the normal force greater or less than the force of gravity? Greater c. If he was accelerating downward, would the normal force be greater or less than his weight? Less