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Newton’s Laws

Newton’s Laws. Practice. 1. The kilogram is a measure of an object’s: A) weight B) gravity C) force D) mass. 2. Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency is of the rock is to: A) continue to follow a circular path

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Newton’s Laws

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  1. Newton’s Laws Practice

  2. 1 • The kilogram is a measure of an object’s: • A) weight • B) gravity • C) force • D) mass

  3. 2 • Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency is of the rock is to: • A) continue to follow a circular path • B) follow a straight line path

  4. 3 • A sheet of paper can be withdrawn from under a milk carton without toppling it as long as the sheet is pulled quickly. This demonstrates: • A) gravity tends to hold the carton to the ground • B) the carton has inertia • C) for every action there’s an equal reaction

  5. 4 • Your weight is: • A) a property of mechanical equilibrium • B) actually your mass • C) the gravitational attraction between your body and the earth

  6. 5 • One object has twice as much mass as another object, and also has twice as much: • A) volume • B) velocity • C) inertia • D) gravitational acceleration

  7. 6 • Jupiter has 3 times the gravitational force of Earth. So on Jupiter, a 100kg object would have a mass of: • A) 100kg • B) 30kg • C) 300kg • D) 600kg

  8. 7 • An object weighs 20 N on the Earth, another object weighs 20 N on the moon. Which object has more mass? • A) Object on the Earth • B) Object on the Moon • C) Not enough information to say

  9. 8 • The law of inertia applies to: • A) objects at rest • B) objects in motion • C) both moving and nonmoving objects

  10. 9 • A force is a vector quantity because it has both: • A) mass and acceleration • B) action and reaction counterparts • C) magnitude and direction

  11. 10 • 10kg brick and a 1kg brick are dropped in a vacuum, the force of gravity on the 10kg brick is: • A) zero • B) 10 times as much as the 1kg brick • C) the same as the 1kg brick

  12. 11 • An object is propelled along a straight-line path. If it’s force were doubled, then it’s acceleration would: • A) halve • B) quadruple • C) double • D) stay the same

  13. 12 • An object is propelled in a straight-line path by a force. If the mass of the object is somehow doubles, it’s acceleration: • A) halves • B) quadruples • C) doubles • D) stays the same

  14. 13 • An object is pulled northward at 20 N and southward at 15 N. What magnitude of the net force? • 5 N • 35 N • 0 N • 10 N

  15. 14 • A 10N falling object encounters 10N of air resistance. The magnitude of the net force is: • A) 100N • B) 10N • C) 0N • D) Infinite

  16. 15 • An apple is held at rest above your head. The magnitude of the net force of the apple is: • A) 10N • B) 0N • C) 100N • D) between 10N and 0N

  17. 16 • Which has zero acceleration? An object_____ • A) at rest • B) changing its direction • C) changing its speed • D) all of these

  18. 17 • Whenever the net force on an object is zero, the acceleration • A) may be zero • B) is zero

  19. 18 • A car has a mass of 3000kg and accelerates at 2 m/s/s. What is the magnitude of the force exerted on the car? • 1500N • 3000N • 6000N • 2000N

  20. 19 • A tow truck exerts a 2 m/s/s acceleration on a car with a force of 300N. The mass of the car is • A) 600N • B) 3000kg • C) 150kg • D) 1500kg

  21. 20 • A girl pulls a 10kg wagon with a constant force of 300N. What is the wagon’s acceleration in m/s/s? • A) .3 • B) 3000 • C) 30 • D) 1/30

  22. 21 • Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude but in the opposite direction. • A) Always true • B) Sometimes true • C) Usually true

  23. 22 • A high school student hits a nail with a hammer. During the collision there is a force: • A) On the hammer but not the nail • B) On the nail but not the hammer • C) On both hammer and nail

  24. 23 • Forces always occur: • A) in singles • B) in pairs • C) in triplets • D) in space

  25. 24 • A rocket is able to propel itself in in the vacuum of space by firing its engines. The force that propels the rocket is: • A) The exhaust gasses pushing on space • B) The exhaust gasses heating up the ship • C) The exhaust gasses rushing away from the ship

  26. 25 • An archer shoots an arrow. Consider the action force to be the bowstring pushing against the arrow. The reaction force is: • A) air resistance pushing against the arrow • B) the grip of the archers hand on the bow • C) the push of the arrow against the bowstring • D) none of these

  27. 26 • A baseball player bats a ball with a force of 1000N, the ball exerts a reaction force against the bat of • A) 100N • B) 1000N • C) A little less than 1000N • D) Not enough information

  28. 27 • As the ball falls, the action force is the mass of the earth pulling on the ball. The reaction force is • A) the ball’s pull on the earth • B) nonexistent in this case • C) the ball hitting the ground • D) air resistance

  29. 28 • A karate chop delivers a blow of 3,000N to a board that breaks. The force that acts on the hand is actually: • A) more than 3000N • B) less than 3000N • C) exactly 3000N • D) depends if the board was oak or ash

  30. 29 • Arnold Strongman and Suzy Small pull hard in opposite directions in a tug of war. The greatest force on the rope is exerted by: • A) Suzy, suprisingly • B) Arnold, of course • C) both the same

  31. 30 • Which of the following is not an acceleration? • Stopping your bike at an intersection. • Riding your bike at a constant speed around a corner. • Slowing your bike down as you reach the top of the hill. • Riding your bike faster as you ride down the hill. • Riding your bike straight down the street at a constant speed.

  32. 31 • ___________ is the pull that all objects exert on each other. • Resistance • Friction • Inertia • Gravity

  33. 32 • At the surface of Jupiter’s moon Io, the acceleration due to gravity is 2.5 m/s/s. A watermelon weights 44.0 N at the surface of the earth. What is the mass on the earth’s surface? • What are its mass and weight on the surface of Io?

  34. 33 • What is the net force required to give an automobile of mass 1600. kg an acceleration of 4.5 m/s/s?

  35. 34 • During a test crash, an air bag inflates to stop a dummy’s forward motion. The dummy’s mass is 75.0 kg. If the net force on the dummy is 825. N toward the rear of the car, what is the dummy’s acceleration?

  36. 35 • A bicycle takes 8.0 seconds to accelerate at a constant rate from rest to a speed of 4.0 m/s. If the mass of the bicycle and rider together is 85. kg, what is the net force acting on the bicycle?

  37. 36 • You are waiting in line to use the diving board at your local pool. While watching people dive into the pool from the board, you realize that using a diving board to spring into the air before a dive is a good example of Newton’s third law of motion. Explain how a diving board illustrates Newton’s 3rd law.

  38. 37 • If bullets are fired from an airplane in the direction of its motion . . . • the speed of the airplane will increase. • the speed of the airplane will decrease. • there will be no change in the speed of the airplane. • the speed will change but the velocity will remain the same.

  39. 38 • Which exerts more force, the Earth pulling on the moon or the moon pulling on the Earth? Explain.

  40. 39 • When a heavy football player and a light one run into each other, which player hits the other with more force? Explain. Which one is hurt more by the collision? Explain.

  41. 40 • Equilibrium is the state of motion where • All forces on an object are balanced. • An object can be accelerating or sitting at rest. • Both A and B • Neither A nor B

  42. 41 • According to Newton’s second law of motion, if the net force acting on the object increases while the mass of the object remains constant, what happens to the acceleration? • Acceleration decreases • Acceleration increases • Acceleration remains the same • Acceleration is independent of mass

  43. 42 • In order to start a grocery cart in motion, you must exert 72.0 newtons of force on the handle. The mass of the grocery cart is 61.0 kg. How much force does the cart exert on your hand as you accelerate it forward? • 4400 N • 1.2 N • 72.0 N • 0 N

  44. 43 • How much does a 9.8 kg pail of water weigh? • 9.80 kg • 96.0 N • 9.80 N • 96.0 kg

  45. 44 • When an object is not in equilibrium, what kind of motion can it have? • Circular • Accelerating • Decelerating • All of the above

  46. 45 • A helicopter weighs 12,800 N, how much force must its rotors exert on the air in order to start it rising into the air from its landing pad?

  47. 46 • A 2 kg box sits on a 3 kg box which sits on a 5 kg box. The 5 kg box rests on a table top. What is the normal force exerted on the 5 kg box by the table top? • 19.6 N • 29.4 N • 49 N • 98 N

  48. 47 • A 2 kg box sits on a 3 kg box which sits on a 5 kg box. The 5 kg box rests on a table top. What is the normal force exerted by the 5 kg box on the 3 kg box? • 19.6 N • 29.4 N • 49 N • 98 N

  49. 48 • A car pulls on a rope tied to a tree with a force of 1000 N. Which of the following is not true? • The rope pulls on the tree with a force of 1000 newtons. • The tree pulls on the rope with a force of 1000 newtons. • The tension in the rope is 2000 newtons. • The tension in the rope is 1000 newtons.

  50. 49 • A free-body diagram of a ball in free fall would show • a downward arrow to represent the force of air resistance. • only a downward arrow to represent the force of gravity. • a downward arrow to represent the force of gravity and an upward arrow to represent the force of air resistance. • an upward arrow to represent the force of gravity and a downward arrow to represent the force of air resistance.

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