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## Newton s Laws

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**1. **Newtons Laws May the Force be with you!

**2. **Newton Concept Review DIFFICULTY LEVEL
I

**3. **Newton Concept Review Arnold Strongman and Suzie Small each pull very hard on opposite ends of a rope in a tug-of-war. The greater force on the rope is exerted by
A) Suzie, surprisingly.
B) Arnold, of course.
C) both the same, interestingly enough.

**4. **Newton Concept Review Whenever the net force on an object is zero, its acceleration
A) may be more than zero
B) may be less than zero.
C) is zero.

**5. **Newton Concept Review A 10-N falling object encounters 4 N of air resistance. The net force on the object is
A) 4 N.
B) 10 N.
C) 0 N.
D) 6 N.
E) none of these.

**6. **Newton Concept Review An object's weight may properly be expressed in units of
A) cubic centimeters
B) kilograms.
C) meters.
D) newtons.

**7. **Newton Concept Review If an object of constant mass experiences a constant net force, it will have a constant
A) velocity.
B) speed.
C) position.
D) acceleration.
E) more than one of the above

**8. **Newton Concept Review If one object has twice as much mass as another object, it also has twice as much
A) acceleration due to gravity.
B) inertia.
C) velocity.
D) volume.
E) all of these

**9. **Newton Concept Review When a rocket ship accelerating in outer space runs out of fuel it
A) accelerates for a short time, then slows down to a constant velocity.
B) accelerates for a short time, slows down, and eventually stops.
C) no longer accelerates.

**10. **Newton Concept Review A 1-kg mass at the earth's surface weighs
A)1 N.
B)9.8 N.
C)10.8 N.
D)4.9 N.
E) none of these

**11. **Newton Concept Review The newton is a unit of
A) mass.
B) density.
C) inertia.
D) force.

**12. **Newton Concept Review An apple weighs 1 N. When held at rest above your head, the net force on the apple is
A) 0 N.
B) 10 N.
C) 0.1 N.
D) 1 N.
E) none of these

**13. **Newton Concept Review If an object's mass is decreasing while a constant force is applied to the object, the acceleration
A) increases.
B) remains the same.
C) decreases.

**14. **Newton Concept Review A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that
A) gravity tends to hold the milk carton secure.
B) there is an action-reaction pair of forces.
C) the milk carton has inertia.
D) the milk carton has no acceleration.
E) none of these

**15. **Newton Concept Review An apple at rest weighs 1 N. The net force on the apple when it is in free fall is
A) 0.1 N.
B) 10 N.
C) 1 N.
D) 0 N.
E) none of these

**16. **Newton Concept Review A 10-N falling object encounters 10 N of air resistance. The net force on the object is
A) 10 N.
B) 4 N.
C) 0 N.
D) 6 N.
E) none of these

**17. **Newton Concept Review An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration
A) halves.
B) stays the same.
C) quadruples.
D) doubles.
E) none of these

**18. **Newton Concept Review The force of friction on a sliding object is 10 newtons. The applied force needed to maintain a constant velocity is
A) more than 10 N.
B) 10 N.
C) less than 10 N.

**19. **Newton Concept Review A kilogram is a measure of an object's
A) force.
B) size.
C) weight.
D) mass.

**20. **Newton Concept Review Strange as it may seem, it is just as hard to accelerate a car on a level surface on the moon as it is here on the Earth. This is because
A) the weight of the car is independent of gravity.
B) the mass of the car is independent of gravity.
C) Nonsense! A car is much more easily accelerated on the moon than on the Earth.

**21. **Newton Concept Review An object is propelled along a straight-line path by a force. If the net force were doubled, the object's acceleration would be
A) twice as much.
B) four times as much.
C) the same.
D) half as much.
E) none of these.

**22. **Newton Concept Review Compared to a 1-kg block of solid iron,
a 2-kg block of solid iron has the same
A) mass.
B) weight.
C) volume.
D) all of these
E) none of these

**23. **Newton Concept Review Wherever the is an action force, there must be a reaction force which
A) is slightly smaller than the action force.
B) always acts in the same direction.
C) is slightly larger than the action force.
D) is exactly equal and opposite.

**24. **Newton Concept Review Your weight is
A) a property of mechanical equilibrium.
B) equal to your mass.
C) the gravitational attraction force between you and the Earth.
D) all of these

**25. **Newton Concept Review If no external forces are acting on a moving object it will
A) continue moving at the same velocity.
B) continue moving at the same speed.
C) move slower and slower until it finally stops.

**26. **Newton Concept Review Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much
A) volume.
B) inertia.
C) mass.
D) all of these

**27. **Newton Concept Review Compared to the mass of a certain object on Earth, the mass of the same object on the moon is
A) the same.
B) zero.
C) one sixth as much.
D) six times as much.

**28. **Newton Concept Review A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is
A) more than 1000 N.
B) less than 1000 N.
C) 1000 N.
D) impossible to determine.

**29. **Newton Concept Review An object maintains a constant acceleration unless there is a change in
A) the air resistance.
B) the applied force.
C) its mass.
D) any of the above

**30. **Newton Concept Review An object is pulled northward by a force of 10 N and at the same time another force of 15N pulls it southward. The net force on the object is
A) 5 N.
B) 0 N.
C) 150 N.
D) 25 N.

**31. **Newton Concept Review A force is a vector quantity because it has both
A) mass and acceleration.
B) magnitude and direction.
C) action and reaction counterparts.

**32. **Newton Concept Review DIFFICULTY LEVEL
2

**33. **Newton Concept Review A automobile and a baby carriage traveling at the same speed collide head-on. The impact force is
A) greater on the automobile.
B) greater on the baby carriage.
C) the same for both.

**34. **Newton Concept Review If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity,
A) the friction force increases.
B) the object accelerates opposite the direction of the applied force.
C) the object accelerates in the direction of the applied force.
D) two of the above

**35. **Newton Concept Review A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the
A) Volkswagen.
B) Mack truck.
C) same for both.

**36. **Newton Concept Review An object following a straight-line path at constant speed
A) has no forces acting on it
B) has zero acceleration.
C) has a net force acting upon it in the direction of motion.
D) none of these

**37. **Newton Concept Review A rock is thrown vertically into the air. At the top of its path, its acceleration in m/s2
A) zero.
B) between 0 and 10
C) greater than 10
D) 10

**38. **Newton Concept Review Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction from the first force. The particle with both forces acting on it
A) is brought to a rapid halt.
B) theoretically tends to accelerate toward the speed of light.
C) decelerates gradually to a halt.
D) continues at the speed it had when it encountered the second force.

**39. **Newton Concept Review A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force of impact is
A) greater on the car.
B) greater on the bug.
C) the same for both.

**40. **Newton Concept Review A block is dragged without acceleration in a straight-line path across a level surface by a force of 6 N. What is the force of friction between the block and the surface?
A) 6 N
B) more than 6 N
C) less than 6 N
D) need more information to say

**41. **Newton Concept Review According to Newton's law of inertia, a rail road train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains
A) are much too heavy.
B) must go up and down hills.
C) move too slowly.
D) always have forces that oppose their motion.

**42. **Newton Concept Review The mass of a pet turtle that weighs 10 N is
A) about 100 kg.
B) about 10 kg.
C) about 1 kg.
D) about 1000 kg.
E) none of these

**43. **Newton Concept Review If the mass of an object does not change, a constant net force on the object produces constant
A) velocity.
B) acceleration.
C) both of these
D) neither of these

**44. **Newton Concept Review If your automobile runs out of fuel while you are driving the engine stops but you do not come to an abrupt stop. The concept that most explains why is
A) resistance. B) acceleration.
C) inertia. D) gravity.

**45. **Newton Concept Review A force of 1 N accelerates a mass of 1 kg at the rate of 1 m/s^2. The acceleration of a mass of 2 kg acted upon by a net force of 2 N is
A) the same.
B) twice as much.
C) half as much.
D) none of these.

**46. **Newton Concept Review If less horizontal force is applied to a sliding object than is needed to maintain a constant velocity,
A) the friction force increases.
B) the object accelerates in the direction of the applied force.
C) the object eventually slides to a stop.
D) none of the above

**47. **Newton Concept Review A bag of groceries has a mass of 10 kilograms and a weight of
A) about 10 N.
B) about 1 N.
C) about 100 N.
D) about 1000 N.
E) more than 1000 N.

**48. **Newton Concept Review A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car?
A) 500 kg B) 1500 kg
C) 1000 kg D) 3000 kg
E) none of these

**49. **Newton Concept Review A girl pulls on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration in meters per second per second?
A) 10 B) 30
C) 0.3 D) 300
E) 3.0

**50. **Newton Concept Review A push on a 1-kg brick accelerates it. Neglecting friction, to equally accelerate a 10-kg brick, one would have to push with
A) just as much force.
B) one tenth the amount of force.
C) 10 times as much force.
D) 100 times as much force.
E) none of these

**51. **Newton Concept Review The maximum acceleration of a car while towing a second car twice its mass, compared to its acceleration with no car in tow, is
A) one third. B) the same.
C) one half. D) one fourth.
E) none of these

**52. **Newton Concept Review A car has a mass of 1000 kg and accelerates at 2 meters per second per second. What is the magnitude of the net force exerted on the car?
A) 1000 N B) 1500 N
C) 2000 N D) 500 N
E) none of these

**53. **Newton Concept Review A jumbo jet has a mass of 100,000 kg. The thrust for each of its four engines is 50,000 N. What is the jet's acceleration in meters per second per second when taking off? 50)
A) 1 B) 4
C) 0.25 D) 2
E) none of these

**54. **Newton Concept Review The force required to maintain an object at a constant velocity in free space is equal to
A) the force required to stop it.
B) zero.
C) the weight of the object.
D) the mass of the object.
E) none of these

**55. **Newton Concept Review WARNING! WARNING!
DIFFICULTY LEVEL
3

**56. **Newton Concept Review A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the stone when it is halfway to the top of its path is about
A) 7.5 N. B) 1 N.
C) 1/2 N. D) 10 N.
E) 5 N.
WARNING! PPC AHEAD!!

**57. **Newton Concept Review An astronaut on another planet drops a
1-kg rock from rest and finds that it falls a vertical distance of 2.5 meters in one second. On this planet, the rock has a weight of
A) 1 N. B) 2 N. C) 3 N.
D) 4 N. E) 5 N.
WARNING! PPC AHEAD!!

**58. **Newton Concept Review A 10-kilogram block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block in meters per second per second is
A) 5. B) 2.
C) 1. D) 10.
E) none of these

**59. **Newton Concept Review A rock weighs 30 N on Earth. A second rock weighs 30 N on the moon. Which of the two rocks has the greater mass?
A) the one on Earth
B) the one on the moon
C) They have the same mass.
D) not enough information to say

**60. **Newton Concept Review In which case would you have the largest mass of gold? If your chunk of gold weighed 1 N on the
A) Earth.
B) planet Jupiter.
C) moon.
WARNING! PPC AHEAD!!

**61. **Newton Concept Review What horizontally-applied force will accelerate a 400-kg crate at 1 m/s to power of ((2)) across a factory floor against a friction force half its weight?
A) 1600 N B) 2400 N
C) 600 N D) 2000 N
E) none of these
WARNING! PPC AHEAD!!

**62. **Newton Concept Review An object released from rest on another planet requires one second to fall a distance of 6 meters. What is the acceleration in meters per second per second due to gravity on this planet?
A) 12 B) 3
C) 6 D) 15
E) none of these
WARNING! PPC AHEAD!!

**63. **Newton Concept Review A 10-kilogram block with an initial velocity of 10 m/s slides 10 meters across a horizontal surface and comes to rest. It takes the block 2 seconds to stop. The stopping force acting on the block is about
A) 50 N. B) 10 N.
C) 5 N. D) 25 N.

**64. **Newton Concept Review A horse exerts 500 N of force on a heavy wagon. The wagon pulls back on the horse with an equal force. The wagon still accelerates because
A) these forces are not an action-reaction pair.
B) the wagon is not alive.
C) the wagon does not accelerate because these forces are equal and opposite.
D) nevertheless there is still an unbalanced force on the wagon.
WARNING! PPC AHEAD!!

**65. **Newton Concept Review A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree. What is the deceleration in m/s2 of the car?
A) -880 B) +220
C) -220 D) +880