Chapter 36 Summary – Magnetism



Directions: For all math problems, show all steps of the GUESS method. Answers are in italicized parenthesis. Some problems may require an explanation, give a complete thought. For all problems, ignore friction and air resistance unless stated otherwise.

Newton’s 2nd Law

1) How much force is required to accelerate a 2 kg mass at 3 m/s2? (6 N)

1) Given a force of 100 N and an acceleration of 10 m/s2, what is the mass? (10 kg)

2) What is the acceleration of a 10 kg mass pushed by a 5 N force? (0.5 m/s2)

3) Given a force of 88 N and an acceleration of 4 m/s2, what is the mass? (22 kg)

4) How much force is required to accelerate a 5 kg mass at 20 m/s2? (100 N)

5) What is the acceleration of a 5 kg mass pushed by a 10 N force? (2 m/s2)

6) Given a force of 56 N and an acceleration of 7 m/s2, what is the mass? (8 kg)

7) How much force is required to accelerate an 8 kg mass at 5 m/s2? (40 N)

8) What is the acceleration of a 25 kg mass pushed by a 6 N force? (0.24 m/s2)

9) What is the acceleration of a 10 kg mass pushed by a 2.5 N force? (0.25 m/s2)

10) Given a force of 87.3 N and an acceleration of 5 m/s2, what is the mass? (17.46 kg)

11) How much force is required to accelerate a 50 kg mass at 7.3 m/s2? (365 N)

12) What is the acceleration of a 17 kg mass pushed by a 9 N force? (0.53 m/s2)

13) How much force is required to accelerate a 52.4 kg mass at 4.3 m/s2? (225.32 N)

14) What is the acceleration of a 9 kg mass being pulled by a 56 N force? (6.22 m/s2)

15) Given a force of 47.7 N and an acceleration of 7 m/s2, what is the mass? (6.81 kg)

16) What is the acceleration of a 23 kg mass pushed by an 8 N force? (0.35 m/s2)

17) How much force is required to accelerate a 17.61 kg mass at 2 m/s2? (35.22 N)

18) What is the mass of a block accelerating at 2 m/s2 and pushed by a 9 N force? (4.5 kg)

19) How much force is required to accelerate a 22 kg mass at 6 m/s2? (132 N)

20) What is the acceleration of a 170 kg mass being pulled by a 14 N force? (0.08 m/s2)

21) What net force is necessary to accelerate a 300 kg object at 3.7 m/s2? (1110 N)

22) A 13 kg block of ice is resting on a frozen pond. How much force will it take to accelerate the ice at 0.23 m/s2? (2.99 N)

23) A 121.4 N force is applied to a 500 kg crate resting on frictionless wheels. Calculate “a”. (0.24 m/s2)

24) An 82.6 kg basketball player jumps and accelerates up at 16.4 m/s2. What force do his shoes exert on the ground during this acceleration? (1354.64 N)

25) A large 50 kg crate is at rest on level ground. Two people push on the crate. One pushes north with 200 N while the other pushes South with 50 N. If there is no friction, draw a diagram of this object labeling all forces. Find the acceleration and direction of acceleration for the crate. (3 m/s2 North)

26) A 30 kg computer is held up by a member of the Geek Squad. What force is needed by the geek to accelerate the computer upward at 1 m/s2? (30 N)

Newton’s 2nd Law Diagrams

27) Find the acceleration of the 2 kg block in the following diagram. [pic] (2 m/s2 left)

28) Find the acceleration of the 1 kg block in the following diagram. [pic] (4 m/s2 down)

29) Find the acceleration of the 8 kg block in the following diagram. [pic] (3.38 m/s2 left)

30) Find the acceleration of the 3 kg block in the following diagram. [pic] (5.33 m/s2 left)

31) What will be the acceleration of the 20 kg block? What if friction is 7 N? [pic] (1.96 m/s2, 1.68 m/s2)

32) What will be the acceleration of the 10 kg block? What if friction is 8 N? [pic] (1.63 m/s2, 0.97 m/s2)

33) What will be the acceleration of the block? [pic] (1.63 m/s2)

34) Mass 1 = 50 kg, mass 2 = 30 kg, friction on the slope is 30 N. What is the net force on block 1? Will block 1 be pulled up the slope, or slide down the slope? With what acceleration? (19 N up the slope, up, 0.24 m/s2) [pic]

35) A 3 kg ball sits atop a 35o slope. What will be the acceleration of the ball down the slope if it encounters 5 N of friction? (3.95 m/s2) [pic]

Terminal Velocity

36) A 5 kg bowling ball is falling at terminal velocity. What is its mass? What downward force does gravity pull with? What upward force does air push with? What is the net force on the ball? What is its acceleration? (5 kg, 49 N, 49 N, 0 N, 0 m/s2)

37) A 820 N skydiving man is falling at terminal velocity. What is his mass? How much air resistance does he feel? What is his acceleration? What is the net force acting on him? (83.67 kg, 820 N, 0 m/s2, 0 N)

38) A raindrop falling at terminal velocity feels 4 N of air resistance. What force is pushing up? How much does that raindrop weigh? What is the mass of that drop of water? (4 N, 4 N, 0.41 kg)

Newton’s 2nd Law and Linear Motion

39) A 10 N force is applied to a 2 kg mass at rest. How fast will it be going in 10 seconds? (50 m/s)

40) A 64 N force is applied to a 9 kg mass at rest. How fast will it be going in 5 seconds? (35.56 m/s)

41) What force is necessary to accelerate a 5 kg mass from rest to 10 m/s in 5 seconds? (10 N)

42) A 46 kg rocket generates 983 N of thrust. What will be its acceleration launched straight up? (11.57 m/s2)

43) A 10 kg block of ice slides across the floor. If the force of friction on the ice is 4 N, what will be the acceleration of the block? How long will it take to come to rest if it was initially sliding at 8 m/s2? (0.4 m/s2, 20 s)

44) A force of 15 Newtons is applied to a resting object with a mass of 5 kilograms. What will be the object's final velocity after 10 seconds? (30 m/s)

45) A big 100 kg box is rolling on frictionless wheels, to the West at 4 m/s. If you need to stop it in 2 seconds, what force will this require (direction too)? (200 N East)

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