Physics Christmas Break Packet w/ Answers Which vector below represents the resultant of the two displacement vectors shown?

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1 Physics hristmas reak Packet w/ nswers 2018 Name: ate: 1. Which vector below represents the resultant of the two displacement vectors shown? 4. The accompanying diagram represents a block sliding down an incline..... Which vector best represents the frictional force acting on the block? Which is a vector quantity?. distance. time. mass. velocity 5. blinking light of constant period is situated on a lab cart. Which diagram best represents a photograph of the light as the cart moves with constant velocity? 3. vector is a quantity that has. magnitude, only. direction, only. either magnitude or direction..... both magnitude and direction page 1

2 6. car is driven from uffalo to lbany and on to New York ity, as shown in the diagram. ompared to the magnitude of the car s total displacement, the distance driven is 7. ase your answer(s) to the following question(s) on the diagram below which shows a 2.0-kilogram cart traveling at a constant speed in a horizontal circle of radius 3.0 meters. The magnitude of the centripetal force of the cart is 24 newtons.. shorter. longer. the same Which statement correctly describes the direction of the cart s velocity and centripetal force in the position shown?. Velocity is directed toward point, and the centripetal force is directed toward point.. Velocity is directed toward point, and the centripetal force is directed toward point.. Velocity is directed toward point, and the centripetal force is directed toward point.. Velocity is directed toward point, and the centripetal force is directed toward point. page 2 Physics hristmas reak Packet w/ nswers 2018

3 8. ase your answer(s) to the following question(s) on the graph, which represents the relationship between the displacement of an object and its time of travel along a straight line. 10. The accompanying graph represents the relationship between the force applied to a spring and the compression (displacement) of the spring. What is the magnitude of the object s total displacement after 8.0 seconds?. 0 m. 2 m. 8 m. 16 m What is the spring constant for this spring? 9. Which pair of graphs represent the same motion? N/m. 2.5 N/m N/m N/m... page 3 Physics hristmas reak Packet w/ nswers 2018

4 11. ase your answer(s) to the following question(s) on the information and diagram below. ball is thrown horizontally with an initial velocity of 20.0 meters per second from the top of a tower 60.0 meters high. 12. lab cart is loaded with different masses and moved at various velocities. Which diagram shows the cartmass system with the greatest inertia?.. What is the horizontal velocity of the ball just before it reaches the ground? [Neglect air resistance.] m/s m/s m/s m/s. page 4 Physics hristmas reak Packet w/ nswers 2018

5 13. In the diagram below, a block of mass M initially at rest on a frictionless horizontal surface is struck by a bullet of mass m moving with horizontal velocity v. 15. steel ball is dropped from a height of 100 meters. Which velocity-time graph best describes the motion of the ball?.. What is the velocity of the bullet-block system after the bullet embeds itself in the block?.. ( M + v M ) m. ( m + v ) m. M ( m + M m ) v ( m ) v m + M The graph below represents the velocity of an object traveling in a straight line as a function of time. 16. The graph shown represents the motion of a cart. ccording to the graph, as time increases, the speed of the cart. decreases. increases etermine the magnitude of the total displacement of the object at the end of the first 6.0 seconds.. remains the same page 5 Physics hristmas reak Packet w/ nswers 2018

6 17. istance is to displacement as 19. In the accompanying diagram, a 100.-kilogram clown is fired from a 500.-kilogram cannon.. force is to weight. speed is to velocity. velocity is to acceleration. impulse is to momentum If the clown s speed is 15 meters per second after the firing, then the recoil speed (v) of the cannon is. 75 m/s. 15 m/s. 3.0 m/s. 0 m/s 18. Which pair of graphs represent the same motion? Two forces are applied to a 2.0-kilogram block on a frictionless horizontal surface, as shown in the accompanying diagram.. The acceleration of the block is m/s 2 to the right. 2.5 m/s 2 to the left. 2.5 m/s 2 to the right. 4.0 m/s 2 to the left page 6 Physics hristmas reak Packet w/ nswers 2018

7 21. The accompanying diagram represents the relationship between velocity and time of travel for four cars,,,, and, in straight-line motion. 23. man standing on a scale in an elevator notices that the scale reads 30 newtons greater than his normal weight. Which type of movement of the elevator could cause this greater-than-normal reading?. accelerating upward. accelerating downward. moving upward at constant speed. moving downward at constant speed Which car has the greatest acceleration during the time interval 10. seconds to 15 seconds? The accompanying diagram shows two carts that were initially at rest on a horizontal, frictionless surface being pushed apart when a compressed spring attached to one of the carts is released. art has a mass of 3.0 kilograms and cart has a mass of 5.0 kilograms. 24. The diagram below represents the path of an object after it was thrown. What happens to the object s acceleration as it travels from to? [Neglect friction.] If the speed of cart is 0.33 meter per second after the spring is released, what is the approximate speed of cart after the spring is released?. It decreases.. It increases.. It remains the same m/s m/s m/s m/s page 7 Physics hristmas reak Packet w/ nswers 2018

8 kilogram steel block is at rest on a friction-less horizontal surface. 1.0-kilogram lump of clay is propelled horizontally at 6.0 meters per second toward the block as shown in the diagram below. 26. The diagram here shows a 1-kilogram stone being dropped from a bridge 100 meters above a gorge. Upon collision, the clay and steel block stick together and move to the right with a speed of. 1.5 m/s. 2.0 m/s. 3.0 m/s. 6.0 m/s Which graph of distance traveled versus time represents the motion of the freely falling stone? car, starting from rest, accelerates at 4.0 m/sec 2. What is its velocity at the end of 8.0 seconds? m/sec. 2.0 m/sec. 16 m/sec. 32 m/sec page 8 Physics hristmas reak Packet w/ nswers 2018

9 28. Which velocity-time graph represents the motion of an object moving with constant acceleration? 31. The accompanying diagram shows a granite block being slid at constant speed across a horizontal concrete floor by a force parallel to the floor..... Which pair of quantities could be used to determine the coefficient of friction for the granite on the concrete?. mass and speed of the block. mass and normal force on the block. frictional force and speed of the block. frictional force and normal force on the block 29. Which graph best represents the motion of an object that was initially at rest and is accelerating uniformly? n unbalanced force of 20 newtons is applied to a 4.0-kilogram mass at rest. The acceleration of the object is closest to m/sec m/sec m/sec m/sec ball dropped from a bridge takes 3.0 seconds to reach the water below. How far is the bridge above the water?. 15 m. 29 m. 44 m. 88 m 33. Which of the following is a unit of force?. kilogram. newton. kg-m/sec. m/sec 2 page 9 Physics hristmas reak Packet w/ nswers 2018

10 34. Which graph best represents the relationship between the unbalanced force applied to a body and the body s acceleration? ase your answer(s) to the following question(s) on the diagram which shows a ball thrown toward the eat and upward at an angle of 30 to the horizontal. Point X represents the ball s highest point... n object is thrown horizontally off a cliff with an initial velocity of 5.0 meters per second. The object strikes the ground 3.0 seconds later. What is the horizontal speed of the object 1.0 second after it is released? [Neglect friction.]. 5.0 m/s. 10 m/s. 15 m/s. 30 m/s 35. cannon fires a projectile at an angle with the horizontal. The horizontal component of the projectile s initial velocity is 866 meters per second and its initial vertical component is 500 meters per second. [Neglect air resistance.] 37. n object is thrown horizontally off a cliff with an initial velocity of 5.0 meters per second. The object strikes the ground 3.0 seconds later. How far from the base of the cliff will the object strike the ground? [Neglect friction.]. 2.9 m. 9.8 m. 15 m. 44 m What is the shape of the path that the projectile will follow?. circular. straight. hyperbolic. parabolic 38. n object is thrown horizontally off a cliff with an initial velocity of 5.0 meters per second. The object strikes the ground 3.0 seconds later. What is the vertical speed of the object as it reaches the ground? [Neglect friction.]. 130 m/s. 29 m/s. 15 m/s. 5.0 m/s page 10 Physics hristmas reak Packet w/ nswers 2018

11 39. ball is projected horizontally to the right from a height of 50 meters, as shown in the diagram. Which diagram best represents the position of the ball at 1.0-second intervals? [Neglect air resistance.]. 41. Which graph represents the relationship between the magnitude of the gravitational force, F g, between two masses and the distance, r, between the centers of the masses? On the surface of Earth, a spacecraft has a mass of kilograms. What is the mass of the spacecraft at a distance of one Earth radius above Earth s surface? kg kg kg kg 42. The centers of two 15.0-kilogram spheres are separated by 3.00 meters. The magnitude of the gravitational force between the two spheres is approximately N N N N page 11 Physics hristmas reak Packet w/ nswers 2018

12 43. The diagram given shows two carts on a horizontal, frictionless surface being pushed apart when a compressed spring attached to one of the carts is released. art has a mass of 3.0 kilograms and cart has a mass of 5.0 kilograms. The speed of cart is 0.33 meters per second after the spring is released. If the carts are initially at rest, what is the approximate speed of cart after the spring is released? kilogram cart,, and a 3.0-kilogram cart,, are initially held together at rest on a horizontal, frictionless surface. When a compressed spring attached to one of the carts is released, the carts are pushed apart. fter the spring is released, the speed of cart is 6.0 meters per second, as represented in the diagram below m/s m/s m/s m/s What is the speed of cart after the spring is released?. 14 m/s. 6.0 m/s. 3.0 m/s. 2.6 m/s 46. n electron in a magnetic field travels at constant speed in the circular path represented in the diagram below. 44. On the surface of planet X, a body with a mass of 10. kilograms weighs 40. newtons. The magnitude of the acceleration due to gravity on the surface of planet X is m/s m/s m/s m/s 2 Which arrow represents the direction of the net force acting on the electron when the electron is at position?.... page 12 Physics hristmas reak Packet w/ nswers 2018

13 47. The graph below represents the relationship between velocity and time of travel for a toy car moving in a straight line. 50. The Hubble telescope s orbit is meters above Earth s surface. The telescope has a mass of kilograms. Earth exerts a gravitational force of newtons on the telescope. The magnitude of Earth s gravitational field strength at this location is N/kg N/kg. 8.3 N/kg. 9.8 N/kg The shaded area under the line represents the toy car s. displacement. momentum. acceleration. speed 48. When the sum of all the forces acting on a block on an inclined plane is zero, the block. must be at rest 51. n object is in equilibrium. Which force vector diagram could represent the force(s) acting on the object?... must be accelerating. may be slowing down. may be moving at constant speed kilogram space vehicle is traveling along a straight line at a constant speed of 800. meters per second. The magnitude of the net force on the space vehicle is. 0 N N N N page 13 Physics hristmas reak Packet w/ nswers 2018

14 kilogram object is acted upon by an impulse having a magnitude of 15 newton seconds. What is the magnitude of the object s change in momentum due to this impulse?. 5.0 kg m/s. 15 kg m/s. 3.0 kg m/s. 45 kg m/s 53. body,, is moving at constant speed in a horizontal circular path around point P. Which diagram shows the direction of the velocity (v) and the direction of the centripetal force (F c ) acting on the body?.... page 14 Physics hristmas reak Packet w/ nswers 2018

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