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


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1 PAGE 1 OF 14 CONTACT NUMBER: (786) PHYSICS I NEWTON S LAWS OF MOTION PRACTICE PROBLEMS 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 135kg 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]
2 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] PAGE 2 OF 14
3 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] PAGE 3 OF 14
4 6. A.22 rifle bullet, traveling at 350 m/s, strikes a block of soft wood, which it penetrates to a depth of 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? [ ] PAGE 4 OF 14
5 PAGE 5 OF 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 ]
6 8. Two crates, of mass 75 kg and 110 kg, are in contact and at rest on a horizontal surface. A 730N force is exerted on the 75kg 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/, ] PAGE 6 OF 14
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8 PAGE 7 OF 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.
9 10. If, find the acceleration of block 2. Assume. [3.50 m/ downward] PAGE 8 OF 14
10 11. Find the tension in each cord if the weight of the suspended object is 490 N. PAGE 9 OF 14
11 12. Find the tension in each cord if the weight of the suspended object is 490 N. PAGE 10 OF 14
12 If, find the acceleration of block B. Assume. [3.50 m/ downward] PAGE 11 OF 14
13 PAGE 12 OF A child sits on a merrygoaround, 1.5 meters from the center. The merrygoaround 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 merrygoaround to make one revolution?
14 PAGE 13 OF 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?
15 PAGE 14 OF 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
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