MODULE 4. Assignment 4 NEWTON’s LAWS OF MOTION

1. Motion is a vector if it includes both distance and

1. 1. speed.
   2. length.
   3. position.
   4. direction.
2. A bicyclist traveling on a straight road went from 0 m/s to 2m/s in 2 seconds. What was the bicyclist’s acceleration?
   1. 1 m/s²
   2. 2 m/s²
   3. 4 m/s²
   4. none of the above
3. In the sketch below, what is the net force acting on the block?
   1. 0 N to the right
   2. 3 N to the right
   3. 6 N to the right
   4. 9 N to the right
4. What determines the inertia of any object?
   1. its mass
   2. its volume
   3. friction acting on it
   4. two of the above
5. An object’s velocity will change only if it is acted on by a(n)
   1. net force.
   2. strong force.
   3. moving force.
   4. unbalanced force.
6. The pressure exerted by a fluid depends on its
   1. mass.
   2. depth.
   3. density.
   4. two of the above

7. An object in motion will stay in motion and an object at rest will stay at rest unless acted upon by an outside force.  Which law does this describe? MODULE 4. Assignment 4 NEWTON’s LAWS OF MOTION.

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1. Newton’s 1st Law
2. Newton’s 2nd Law
3. Newton’s 3rd Law
4. Newton’s 4th Law

8. What are the units for ACCELERATION?
   1. m/s ²
   2. mi / s
   3. kilograms
   4. km/hr North
9. In a football game, two players tackle each other so hard that they both fly in opposite directions after they hit each other.  What law of motion is this an example of?
   1. Newton’s 1st Law
   2. Newton’s 2nd Law
   3. Newton’s 3rd Law
   4. Newton’s 4th Law
10. . A truck and a trailer weigh 4000 kg EACH.  In order to accelerate at 2 m/s², how much force would need to be produced?
    1. 8,000 Newtons
    2. 2,000 Newtons
    3. 16,000 Newtons
    4. 4,000 Newtons
    5. If a dog pulls a 5 kg bike with a force of 70N, how quickly did it accelerate?

350 m/s ²

50 m/s ²

35 m/s ²

14 m/s ²

15. The force required to maintain an object at a constant velocity in free space is equal to
16. A) zero.
17. B) the mass of the object.
18. C) the weight of the object.
19. D) the force required to stop it.

16. If you jump vertically while inside a fast-moving train that is slowing down, you land
17. A) a bit ahead of your original position.
18. B) at your original position.
19. C) a bit behind your original position. MODULE 4. Assignment 4 NEWTON’s LAWS OF MOTION.

17. A 10-kg block is pushed across a friction-free horizontal surface with a horizontal force of 20 N. The acceleration of the block is
18. A) 1 m/s2.
19. B) 2 m/s2.
20. C) 5 m/s2.
21. D) 10 m/s2.
22. E) none of the above

18. A jumbo jet of mass 100,000 kg during takeoff experience a thrust for each of its four engines of 50,000 N, producing an acceleration of
19. A) 0.5 m/s2.
20. B) 1 m/s2.
21. C) 2 m/s2.
22. D) 4 m/s2.
23. E) none of the above

19. You drive your car along the highway at a constant 60 km/h and apply the brakes until the car slows to 40 km/h. If at that moment you suddenly release the brakes, the car tends to
20. A) momentarily regain its higher initial speed.
21. B) continue moving at 40 km/h.
22. C) decrease in speed if no other forces act.

20. If an object falls with constant acceleration, the velocity of the object must
21. A) be constant also.
22. B) continually change by the same amount each second.
23. C) continually change by varying amounts, depending on its speed.
24. D) continually decrease.
25. E) none of the above

True or False

Write true if the statement is true or false if the statement is false.

_____ The slope of a distance-time graph represents speed.

_____ Speed is a vector unless it is equal to zero.

_____  You can stand on a sidewalk without slipping because of static friction.

_____ . Rolling friction is stronger than sliding friction.

_____ Newton’s second law of motion is also called the law of inertia.

_____  The acceleration of an object equals the net force acting on the object times the object’s mass.

_____ When the same amount of force is exerted over a greater area, it produces greater pressure.

_____ Archimedes’ law states that the buoyant force acting on an object in a fluid equals the weight of the water displaced by the object.

_____ A machine cannot increase the amount of work that is done.

_____ When the threads of a screw are farther apart, the screw has a greater mechanical advantage.

Fill in the Blank

Fill in the blank with the appropriate term.

1. Acceleration is a change in speed or __________.
2. __________ was the first person to suggest that gravity affects all objects in the universe.
3. A stretched rubber band returns to its original shape when released because it has the property of __________.
4. According to Newton’s __________ law of motion, forces always act in pairs. MODULE 4. Assignment 4 NEWTON’s LAWS OF MOTION.

. 5. An object’s mass multiplied by its velocity equals its __________.

6. The upward force exerted by a fluid is known as __________ force.

7/. In a(n) __________ class lever, the input and output forces are on opposite sides of the fulcrum

Essay type question

Answer the following questions in complete sentences.

1. . Relate the concepts of force, weight, and mass.

2. Discuss in detail the Newton’s laws of Motion

MODULE 4. Assignment 4 NEWTON’s LAWS OF MOTION