physics(newtons law of motion)

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NEWTON’S LAWS OF MOTION PRACTICE PROBLEMS 5.1

1. If a net horizontal force of 130 N is applied to a person with mass 60.0 kg who is resting on the edge of a swimming pool, what horizontal acceleration is produced? [2.2 m/ ]

2. What magnitude of net force is required to give a 135-kg refrigerator an acceleration of magnitude 1.40 m/ .[189 N]

3. A box rests on a frozen pond, which serves as a frictionless horizontal surface. If a fisherman applies a horizontal force with magnitude 48.0 N to the box and produces an acceleration of magnitude 3.00 m/ , what is the mass of the box? [16.0 kg]


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4. A crate with mass 32.5 kg initially at rest on a warehouse floor is acted on by a net horizontal force of 140 N. What acceleration is produced? How far does the crate travel in 10.0 s? What is its speed at the end of

10.0 s? [4.31 m/ , 215 m, 43.1 m/s]


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5. At the surface of Jupiter’s moon Io, the acceleration due to gravity is . 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? [4.49 kg, 4.49 kg, 8.13 N]


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6. A .22 rifle bullet, traveling at 350 m/s, strikes a block of soft wood, which it penetrates to a depth of 0.130 m. The block of wood is clamped in place and doesn’t move. The mass of the bullet is 1.80 g. Assume a constant retarding force. How much time is required for the bullet to stop? What force, in newtons, does the wood exert on the bullet? [ ]


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7. Given 30.0 N of E 60 S of W and 40 E of S. Find the components of each vector. Find the vector components of the resultant force. Find the magnitude and direction of the resultant force. Express your answer in three different ways. [

, or ]


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8. Two crates, of mass 75 kg and 110 kg, are in contact and at rest on a horizontal surface. A 730-N force is exerted on the 75-kg crate. If the coefficient of kinetic friction is 0.15, calculate the acceleration of the system, and the force that each crate exerts on the other. [2.5 m/ , ]


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9. A block lies on a smooth plane tilted at an angle to the horizontal. Determine the acceleration of the block as it slides down the plane. If the block starts from rest 9.10 m up the plane from its base, what will be the block’s speed when it reaches the bottom of the incline? Ignore friction.


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10. If , find the acceleration of block 2. Assume . [3.50 m/downward]


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11. Find the tension in each cord if the weight of the suspended object is 490 N.


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12. Find the tension in each cord if the weight of the suspended object is 490 N.


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13. 10. If , find the acceleration of block B. Assume . [3.50 m/downward]


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14. A child sits on a merry-go-around, 1.5 meters from the center. The merry-go-around is turning at a constant rate, and the child is observed to have a radial acceleration of 2.3 m/ . How long does it take for the merry-go-around to make one revolution?


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15. John is pulling a sled to haul up a snowy hill to this cabin. The slope is 22.0 from the horizontal, the sled has a mass of 16.0 kg, the coefficient of kinetic friction between the sled runners and the snow is 0.130, and John can exert a force of 1400 N parallel to the surface of the hill. What is the largest load of wood (in kg) that John can take in one

trip?


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16. Two objects A and B on a perfectly horizontal surface are connected by a light cord. The mass of A is greater than that of B. A horizontal force is applied to Q as shown in the figure below, accelerating the bodies to the right.

The magnitude of the force exerted by the connecting cord on body P will be

physics(newtons law of motion)

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