9. A 102 kg crate is being pushed across a level floor at a constant speed by a force of 300N directed at an angle of 20.0° below the horizontal, as shown in the Figure below. a) What is the coefficient of kinetic friction between the crate and the floor? b) If the 300 N force is instead pulling the block at an angle of 20.0° above the horizontal, as shown in Figure P4.41b, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in part (a). Answers: (a) 0.256 (b) 0.514 m/s? 20.0° | 20.0°

9. A 102 kg crate is being pushed across a level floor at a constant speed by a force of 300N directed at an angle of 20.0° below the horizontal, as shown in the Figure below. a) What is the coefficient of kinetic friction between the crate and the floor? b) If the 300 N force is instead pulling the block at an angle of 20.0° above the horizontal, as shown in Figure P4.41b, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in part (a). Answers: (a) 0.256 (b) 0.514 m/s? 20.0° | 20.0°

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter5: More Applications Of Newton’s Laws

Section: Chapter Questions

Problem 4P

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”

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9. A 102 kg crate is being pushed across a level floor at a constant speed by a force of 300N
directed at an angle of 20.0° below the horizontal, as shown in the Figure below.
a) What is the coefficient of kinetic friction between the crate and the floor? b) If the 300 N force
is instead pulling the block at an angle of 20.0° above the horizontal, as shown in Figure P4.41b,
what will be the acceleration of the crate? Assume that the coefficient of friction is the same as
that found in part (a).
Answers: (a) 0.256
(b) 0.514 m/s?
20.0°
| 20.0°
a

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