Grade 11 Objective 5

1. Grade 11 Objective 5

2. 1 During an investigation, students accelerated boxes using different forces and then determined the masses of the boxes. What is the mass in grams of a box that requires 0.1 newton to make it accelerate 2 m/s2? A 50 g B 20 g C 0.05 g D 0.02 g

3. Students conducting an investigation on forces pushed a box across a smooth floor using different amounts of force. The students collected the following data: 2 Which of the following calculated values would be the same for all 4 trials? A Acceleration B Power C Speed D Work

4. 3 A ball moving at 30 m/s has a momentum of 15 kg·m/s. The mass of the ball is — A 45 kg B 15 kg C 2.0 kg D 0.5 kg

5. 4 How much work is performed when a 50 kg crate is pushed 15 m with a force of 20 N? F 300 J G 750 J H 1,000 J J 15,000 J

6. 5 If a force of 100 newtons was exerted on an object and no work was done, the object must have — A accelerated rapidly B remained motionless C decreased its velocity D gained momentum

7. 6 The weight lifter used a force of 980 N to raise the barbell over her head in 5.21 seconds. Approximately how much work did she do in raising the barbell? F 380 J G 982 J H 2,000 J J 10,000 J

8. 7 A mechanic used a hydraulic lift to raise a 12,054 N car 1.89 m above the floor of a garage. It took 4.75 s to raise the car. What was the power output of the lift? A 489 W B 1815 W C 4796 W D 30,294 W

9. Acceleration of an Electrically Powered Bicycle 8 According to this graph, what was the bicycle’s acceleration between 6 and 10 seconds? A 0.0 m/s 2 B 0.65 m/s 2 C 1.6 m/s 2 D 6.5 m/s 2

10. 9 An advertisement claims that a certain truck has the most powerful engine in its class. If the engine has more power, which of the following can the truck’s engine do, compared to every other engine in its class?F Produce fewer emissionsG Operate more efficientlyH Perform work fasterJ Accelerate longer

11. 10 What is the net force exerted on a 90.0 kg race-car driver while the race car is accelerating from 0 to 44.7 m/s in 4.50 s?F 9.8 NG 20 NH 201 NJ 894 N

12. 11 Starting from rest at the center of a skating rink, two skaters push off from each other over a time period of 1.2 s. What is the force of the push by the smaller skater?F 16 NG 32 NH 88 NJ 100 N

13. 12 A horizontal force of 600 N is used to push a box 8 m across a room. Which of these variables must be known to determine the power used in moving the box? A The weight of the box B The potential energy of the box C The time it takes to move the box D The length of the box

14. 13 The speed of sound in human tissue is about 1600 m/s. If an ultrasound pulse takes 1.5 × 10 – 5 s to travel through a tissue, what is the thickness of the tissue? F 2.4 km G 2.4 m H 24 cm J 24 mm

15. 14 A 0.500 kg ball with a speed of 4.0 m/s strikes a stationary 1.0 kg target. If momentum is conserved, what is the total momentum of the ball and target after the collision? A 0.0 kgm/s B 0.5 kgm/s C 1.0 kgm/s D 2.0 kgm/s

16. 15 The table contains data for two wrecking balls being used to demolish a building. What is the difference in momentum between the two wrecking balls? F 300 kgm/s G 200 kgm/s H 150 kgm/s J 0 kgm/s

17. 16 A woman lifts a 57-newton weight a distance of 40 centimeters each time she does a particular exercise. It takes her 0.60 second to lift the weight. How much power does she supply for lifting the weight one time? F 24 W G 34 W H 38 W J 95 W

18. 17 The 500 g cart is moving in a straight line at a constant speed of 2 m/s. Which of the following must the 250 g toy car have in order to maintain the same momentum as the cart? F An acceleration of 5 m/s2 for 2 seconds G A potential energy of 20 J H A constant velocity of 4 m/s J An applied force of 5 N for 5 seconds

19. 18 The table above shows experimental data collected when four cars moved along a straight-line path. According to these data, which car moved with a constant acceleration of 2 m/s2? A Car Q B Car R C Car S D Car T

20. 19 A cyclist moves at a constant speed of 5 m/s. If the cyclist does not accelerate during the next 20 seconds, he will travel — A 0 m B 4 m C 50 m D 100 m

21. 20 A 1-kilogram ball has a kinetic energy of 50 joules. The velocity of the ball is — F 5 m/s G 10 m/s H 25 m/s J 50 m/s

22. 21 The space shuttle orbits Earth at approximately 8000 m/s. The shuttle stays in orbit because the — A shuttle’s action is balanced by Earth’s equal and opposite reaction B combination of gravity and the shuttle’s inertia creates a curved path parallel to Earth’s surface C net gravitational force is zero at the shuttle’s distance from Earth’s center D force of Earth’s gravity pulls the shuttle downward and the force of the moon’s gravity pulls the shuttle upward

23. 22 The frog leaps from its resting position at the lake’s bank onto a lily pad. If the frog has a mass of 0.5 kg and the acceleration of the leap is 3 m/s2, what is the force the frog exerts on the lake’s bank when leaping? A 0.2 N B 0.8 N C 1.5 N D 6.0 N

24. 23 Which of these is the best description of the action-reaction force pair when the space shuttle lifts off from the launch pad? A The ground pushes the rocket up while exhaust gases push down on the ground. B Exhaust gases push down on air while the air pushes up on the rocket. C The rocket pushes exhaust gases down while the exhaust gases push the rocket up. D Gravity pulls the rocket exhaust down while friction pushes up against the atmosphere.

25. 24 After shooting a cannonball, a cannon recoils with a much lower velocity than the cannonball. This is primarily because, compared to the cannonball, the cannon has a — F much greater mass G smaller amount of momentum H greater kinetic energy J smaller force applied to it

26. 25 How many newtons of force does a 50.0 kg deer exert on the ground because of gravity? Record and bubble in your answer on the answer document.

27. 26 Which factor would most likely cause a communications satellite orbiting Earth to return to Earth from its orbit? F An increase in the satellite’s forward momentum G An increase in solar energy striking the satellite H A decrease in the satellite’s size J A decrease in the satellite’s velocity

28. 27 When the air is released from a balloon, the air moves in one direction, and the balloon moves in another direction. Which statement does this situation best illustrate?F What goes up must come down.G For every action there is an equal and opposite reaction.H The shape and size of an object affect air resistance.J The acceleration due to Earth’s gravity is 9.8 m/s2.

29. 28 The picture above shows the directions in which water leaves this scallop’s shell. Which picture below shows the direction the scallop will move? A C B D

30. 29 A wet bar of soap slides 1 meter across a wet tile floor without appearing to slow down. Which of these statements explains why the bar of soap fails to slow down? F A constant force on an object produces a constant positive acceleration. G An object in motion tends to remain in motion in the absence of an external force. H A moving object having constant velocity contains kinetic energy. J An object’s weight is proportional to its mass.

31. 30 Which of these would cause the gravitational force between Earth and the sun to decrease? F An increase in the length of a day on Earth G An increase in the distance between Earth and the sun H An increase in the number of planets orbiting the sun J An increase in the masses of Earth and the sun

32. 31 A hockey player pushed a puck toward the opposite side of a level ice rink. The player expected the puck to continue all the way across the ice, but the puck slowed and stopped before reaching the other side. Which of these best explains why the puck failed to slide all the way to the opposite side? F The puck’s temperature changed. G An upward force acted on the puck. H The puck’s momentum remained unchanged. J An opposing force acted on the puck.

33. 32 The pictures show how an air bag functions in a collision. How much momentum in kg m/s does the air bag absorb from the crash-test dummy if all the crash-test dummy’s momentum is absorbed by the air bag? Record and bubble in your answer to the nearest whole number on the answer document.

34. 33 A leaf from an apple tree falls to the ground more slowly than an apple falls. As an explanation of this observation, the ancient Greeks’ theory of natural place has been replaced by a more recent theory involving gravitational force and — A atomic weight B inertial mass C air resistance D kinetic energy

35. 34 Which setup would require the least force to move a heavy resistance? A C B D

36. 35 What is the efficiency of a pulley system if 25% of the energy applied to the system is converted to heat? A 100% B 75% C 50% D 25%

37. 36 The diagram shows an electric motor lifting a 6 N block a distance of 3 m. The total amount of electrical energy used by the motor is 30 J. How much energy does the motor convert to heat? F 9 J G 12 J H 18 J J 21 J

38. 37 Which lever arrangement requires the least effort force to raise a 500 N resistance? F H G J

39. 38 What is the efficiency of an air conditioner if there is a work input of 320 J and a work output of 80 J? F 4% G 25% H 240% J 400%

40. 39 Which configuration of pulleys and belts shown below will result in the fastest rotation of Spindle 2?F H G J

41. 40 Which of these represents a properly balanced system?A C B D

42. 41 Which lever requires the least effort to lift the load?

43. 42 The image on the screen is inverted because light rays — A condense as they pass through the pinhole B travel through the opening in straight lines C refract as they strike the screen D are polarized by the materials of the screen

44. 43 One tuning fork is struck and placed next to an identical fork. The two forks do not touch. The second tuning fork starts to vibrate because of — F interference G the Doppler effect H resonance J standing waves

45. 44 The pitch of a sound made by plucking a guitar string is determined by the — A frequency of the vibration produced B strength of the plucking force C distance between the strings D shape of the guitar body

46. 45 Which wave has the greatest velocity? A B C D

47. 46 When trying to spear a fish in water, a person needs to take into account the way light bends as it moves from water into air. The bending of light as it passes from one medium into another is known as — F reflection G refraction H diffraction J polarization

48. Laser Light Striking a DVD 47 When a DVD is read, laser light touches the DVD surface and is then measured at location A. What allows light to return to location A after striking the DVD surface?F ConductionG RefractionH MagnificationJ Reflection

49. 48 An empty cup was tightly covered with plastic wrap, and a few grains of salt were sprinkled on top of the plastic. When a tuning fork was struck and placed slightly above the plastic wrap, the salt began to move. Which characteristic of waves does the movement of the salt best demonstrate?A Echo formationB DiffractionC ResonanceD Specular reflection

50. 49 The diagram shows waves approaching a barrier. Which pattern will be formed after the waves pass through the opening in the barrier? A C B D