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Physics Review #1

LCHS Dr.E. Physics Review #1. A girl leaves a history classroom and walks 10 meters north to a drinking fountain. Then she turns and walks 30 meters south to an art classroom. What is the girl’s total displacement from the history classroom to the art classroom?

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Physics Review #1

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  1. LCHS Dr.E Physics Review #1

  2. A girl leaves a history classroom and walks 10 meters north to a drinking fountain. Then she turns and walks 30 meters south to an art classroom. What is the girl’s total displacement from the history classroom to the art classroom? (A) 20 m south (C) 40 m south (B) 20 m north (D) 40 m north

  3. One car travels 40 meters due east in 5.0 seconds, and a second car travels 64 meters due west in 8.0 seconds. During their periods of travel, the cars definitely had the same (A) average velocity (B) total displacement (C) change in momentum (D) average speed

  4. A skater increases her speed uniformly from 2.0 m/s to 7.0 m/s over a distance of 12 meters. The magnitude of her acceleration as she travels this 12 meters is (A) 1.9 m/s2 (C) 2.4 m/s2 (B) 2.2 m/s2 (D) 3.8 m/s2

  5. A ball thrown vertically upward reaches a maximum height of 30 meters above the surface of Earth. At its maximum height, the speed of the ball is (A) 0.0 m/s (C) 9.8 m/s (B) 3.1 m/s (D) 24 m/s

  6. Which object has the most inertia? (A) a 0.001-kilogram bumblebee traveling at 2 meters per second (B) a 0.1-kilogram baseball traveling at 20 meters per second (C) a 5-kilogram bowling ball traveling at 3 meters per second (D) a 10-kilogram sled at rest

  7. A child kicks a ball with an initial velocity of 8.5 meters per second at an angle of 35º with the horizontal, as shown. The ball has an initial vertical velocity of 4.9 meters per second and a total time of flight of 1.0 second. The horizontal component of the ball’s initial velocity is approximately (A) 3.6 m/s (B) 4.9 m/s (C) 7.0 m/s (D) 13 m/s

  8. A child kicks a ball with an initial velocity of 8.5 meters per second at an angle of 35º with the horizontal, as shown. The ball has an initial vertical velocity of 4.9 meters per second and a total time of flight of 1.0 second. The maximum height reached by the ball is approximately (A) 1.2 m (B) 2.5 m (C) 4.9 m (D) 8.5 m

  9. A ball of mass M at the end of a string is swung in a horizontal circular path of radius R at constant speed V. Which combination of changes would require the greatest increase in the centripetal force acting on the ball? (A) doubling V and doubling R (B) doubling V and halving R (C) halving V and doubling R (D) halving V and halving R

  10. A box is pushed toward the right across a classroom floor. The force of friction on the box is directed toward the (A) left (B) right (C) ceiling (D) floor

  11. A 40-kilogram mass is moving across a horizontal surface at 5.0 meters per second. What is the magnitude of the net force required to bring the mass to a stop in 8.0 seconds? (A) 1.0 N (B) 5.0 N (C) 25 N (D) 40 N

  12. What is the speed of a 1.0×103-kg car that has a momentum of 2.0×104 kg•m/ s east? (A) 5.0 × 10–2 m/s (B) 2.0 × 101 m/s (C) 1.0 × 104 m/s (D) 2.0 × 107 m/s

  13. If the speed of a car is doubled, the kinetic energy of the car is (A) quadrupled (B) quartered (C) doubled (D) halved

  14. A 1-kilogram rock is dropped from a cliff 90 meters high. After falling 20 meters, the kinetic energy of the rock is approximately (A) 20 J (B) 200 J (C) 700 J (D) 900 J

  15. A student does 60 joules of work pushing a 3.0-kilogram box up the full length of a ramp that is 5.0 meters long. What is the magnitude of the force applied to the box to do this work? (A) 20 N (B) 15 N (C) 12 N (D) 4.0 N

  16. A boat weighing 9.0 × 102 Newtons requires a horizontal force of 6.0 × 102 Newtons to move it across the water at 1.5 × 101 meters per second. The boat’s engine must provide energy at the rate of (A) 2.5 × 10–2 J (B) 4.0 × 101 W (C) 7.5 × 103 J (D) 9.0 × 103 W

  17. A high school physics student is sitting in a seat reading this question. The magnitude of the force with which the seat is pushing up on the student to support him is closest to (A) 0N (B) 60 N (C) 600N (D) 6,000 N

  18. The diagram above represents a 5.0-N force and a 12-N force acting on point P. The resultant of the two forces has a magnitude of (A) 5.0-N (B) 7.0-N (C) 12-N (D) 13-N

  19. What does the slope of this graph represent? (A) impulse (B) momentum (C) speed (D) power

  20. What does the area under the slope of this graph represent? (A) impulse (B) momentum (C) speed (D) power

  21. A ball dropped from rest falls freely until it hits the ground with a speed of 20 m/s. The time during which the ball is in free fall is approximately (A) 1 s (B) 0.5 s (C) 2 s (D) 10 s

  22. In a 4.0-kilometer race, a runner completes the first kilometer in 5.9 minutes, the second kilo- meter in 6.2 minutes, the third kilometer in 6.3 minutes, and the final kilometer in 6.0 minutes. The average speed of the runner for the race is approximately (A) 0.16 km/min (C) 12 km/min (B) 0.33 km/min (D) 24 km/min

  23. A golf ball is hit with an initial velocity of 15 m/s at an angle of 35 degrees above the horizontal. What is the vertical component of the golf ball’s initial velocity? (A) 8.6 m/s (C) 12 m/s (B) 9.8 m/s (D) 15 m/s

  24. A 60-kg rollerskater exerts a 10-N force on a 30-kg rollerskater for 0.20 second. What is the magnitude of the impulse applied to the 30-kg rollerskater? (A) 50 N•s (B) 2.0 N•s (C) 6.0 N•s (D) 12 N•s

  25. A 10-kilogram block is at rest on a plane inclined at 15° to the horizontal. As the angle of the incline is increased to 30°, the mass of the block will (A) decrease (B) increase (C) remain the same

  26. If the direction of a moving car changes and its speed remains constant, which quantity must remain the same? (A) velocity (B) displacement (C) momentum (D) kinetic energy

  27. Two carts are pushed apart by an expanding spring. If the average force on the 1-kilogram cart is 1 newton, what is the average force on the 2-kilogram cart? (A) 1 N (B) 0.5 N (C) 0.0 N (D) 4 N

  28. A lab cart is loaded with different masses and moved at various velocities. Which diagram shows the cart-mass system with the greatest inertia?

  29. A sled and rider slide down a snow-covered hill that makes an angle of 30° with the horizontal. Which vector best represents the direction of the normal force, FN, exerted by the hill on the sled?

  30. What is the gravitational potential energy with respect to the surface of the water of a 75.0-kg diver located 3.00 m above the water? (A) 2.17104 J (B) 2.21103 J (C) 2.25102 J (D) 2.29101 J

  31. A 60.0-kilogram runner has 1920 joules of kinetic energy. At what speed is she running? (A) 5.66 m/s (B) 8.00 m/s (C) 32.0 m/s (D) 64.0 m/s

  32. The diagram shows points A, B, and C at or near Earth’s surface. As a mass is moved from A to B, 100 joules of work are done against gravity. What is the amount of work done against gravity as an identical mass is moved from A to C? (A) 100 J (B) 173 J (C) 200 J (D) 273 J

  33. Which pair of graphs represents the same motion of an object?

  34. The vector diagram represents two forces, F1 and F2, simultaneously acting on an object. Which vector best represents the resultant of the two forces?

  35. An egg is dropped from a third-story window. The distance the egg falls from the window to the ground is closest to (A) 100 m (B) 101 m (C) 102 m (D) 103 m

  36. The diagram above shows a 5.00-kilogram block at rest on a horizontal, frictionless table Which diagram best represents the force exerted on the block by the table?

  37. On a highway, a car is driven 80 kilometers during the first 1.00 hour of travel, 50 kilometers during the next 0.50 hour, and 40 kilometers in the final 0.50 hour. What is the car’s average speed for the entire trip? (A) 45 km/h (B) 60. km/h (C) 85 km/h (D) 170 km/h

  38. Which quantity is a vector? (A) impulse (B) speed (C) power (D) time

  39. A high-speed train in Japan travels a distance of 300 kilometers in 3.60 × 103 seconds. What is the average speed of this train? (A) 1.20 × 10–2 m/s (B) 12.0 m/s (C) 8.33 × 10–2 m/s (D) 83.3 m/s

  40. A 25-Newton weight falls freely from rest from the roof of a building. What is the total distance the weight falls in the first 1.0 second? (A) 19.6 m (B) 9.8 m (C) 4.9 m (D) 2.5 m

  41. A golf ball is given an initial speed of 20 m/s and returns to level ground. Which launch angle above level ground results in the ball traveling the greatest horizontal distance? [Neglect friction.] (A) 60° (B) 45° (C) 30° (D) 15°

  42. A 0.50-kilogram cart is rolling at a speed of 0.40 meter per second. If the speed of the cart is doubled, the inertia of the cart is (A) halved (B) doubled (C) quadrupled (D) unchanged

  43. Two forces, F1 and F2, are applied to a block on a frictionless, horizontal surface. If the magnitude of the block’s acceleration is 2.0 m/s2, what is the mass of the block? (A) 1kg (B) 5kg (C) 6kg (D) 7kg

  44. Which body is in equilibrium? (A) a satellite orbiting Earth in a circular orbit (B) a ball falling freely toward the surface of Earth (C) a car moving with a constant speed along a straight, level road (D) a projectile at the highest point in its trajectory

  45. What is the weight of a 2.00-kilogram object on the surface of Earth? (A) 4.91 N (B) 2.00 N (C) 9.81 N (D) 19.6 N

  46. A 70-kg cyclist develops 210 Watts of power while pedaling at a constant velocity of 7.0 m/s east. What average force is exerted eastward on the bicycle to maintain this constant speed? (A) 490 N (B) 30 N (C) 3.0 N (D) 0 N

  47. The gravitational potential energy, with respect to Earth, that is possessed by an object is dependent on the object’s (A) acceleration (B) momentum (C) position (D) speed

  48. As a ball falls freely toward the ground, its total mechanical energy (A) decreases (B) increases (C) remains the same

  49. When Earth and the Moon are separated by a distance of 3.84 × 108 meters, the magnitude of the gravitational force of attraction between them is 2.0 × 1020 Newtons. What would be the magnitude of this gravitational force of attraction if Earth and the Moon were separated by a distance of 1.92 × 108 meters? (A) 5.0 × 1019 N (B) 2.0 × 1020 N (C) 4.0 × 1020 N (D) 8.0 × 1020 N

  50. What is the acceleration of the car at t = 5.0 seconds? (A) 0 m/s2 (B) 2.0 m/s2 (C) 2.5 m/s2 (D) 10 m/s2

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