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Chapter 4: Dynamics: Newton's Laws of Motion

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Physics Principles with Applications
Pages: 75 - 108
Physics Principles with Applications

Physics Principles with Applications

Book edition 7th
Author(s) Douglas C. Giancoli
Pages 978 pages
ISBN 978-0321625922

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138 Questions for Chapter 4: Dynamics: Newton's Laws of Motion

  1. What force is needed to accelerate a sled ( mass = 55 kg) at1.4m/s2on horizontal frictionless ice?

    Found on Page 101

  2. A truck is traveling horizontally to the right (Fig.4–38). When the truck starts to slow down, the crate on the (frictionless) truck bed starts to slide. In what direction could the net force be on the crate?(a) No direction. The net force is zero.(b) Straight down (because of gravity).(c) Straight up (the normal force).(d) Horizontal and to the right.(e) Horizontal and to

    Found on Page 99

  3. Why does a child in a wagon seems to fall backward when you give the wagon a sharp pull forward?

    Found on Page 98

  4. The force of gravity on a 2 kg rock is twice as great as that on a 1 kg rock. Why doesn’t the heavier rock fall faster?

    Found on Page 98

  5. You are pushing a heavy box across a rough floor. When you are initially pushing the box, and it accelerates,

    Found on Page 100

  6. How much tension must a cable withstand if it is used to accelerate a 1200 kg car vertically upward at 0.70 m/s2?

    Found on Page 101

  7. (a) You pull a box with a constant force across a frictionless table using an attached rope held horizontally. If you now pull the rope with the same force at an angle to the horizontal (with the box remaining flat on the table), does the acceleration of the box increase, decrease, or remain the same? Explain. (b) What if there is friction?

    Found on Page 99

  8. A 50-N crate sits on a horizontal floor where the coefficient of static friction between the crate and the floor is 0.50. A 20-N force is applied to the crate acting to the right. What is the resulting static friction force acting on the crate?

    Found on Page 100

  9. A 20.0 kg box rests on a table. (a) What is the weight of the box and the normal force acting on it? (b) A 10.0 kg box is placed on top of the 20.0 kg box, as shown in Fig. 4-43. Determine the normal force that the table exerts on the 20.0 kg box and the normal force that the 20.0 kg box exerts on the 10.0 kg box.

    Found on Page 101

  10. The normal force on an extreme skier descending a very steep slope (Fig. 4–42) can be zero if

    Found on Page 100

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