Question

A contestant in a winter sporting event pushes a 45.0 -kg block of ice across a frozen lake as shown in Figure $5.21(\mathrm{a}).$ (a) Calculate the minimum force $F$ he must exert to get the block moving. (b) What is the magnitude of its acceleration once it starts to move, if that force is maintained?

Name: Problem 18, Chapter 5: College Physics
Uploaded: 2020-06-28T03:17:41-08:00
Duration: 4 min 16 s
Channel: Mayukh Banik
Description: A contestant in a winter sporting event pushes a 45.0 -kg block of ice across a frozen lake as shown in Figure 5.21(a). (a) Calculate the minimum force F he must exert to get the block moving. (b) What is the magnitude of its acceleration once it starts to move, if that force is maintained?

   A contestant in a winter sporting event pushes a 45.0 -kg block of ice across a frozen lake as shown in Figure $5.21(\mathrm{a}).$
(a) Calculate the minimum force $F$ he must exert to get the block moving. (b) What is the magnitude of its acceleration once it starts to move, if that force is maintained?

College Physics

Paul Peter Urone,… 1st Edition

Chapter 5, Problem 18

Instant Answer

Solved by Expert Mayukh Banik

06/28/2020

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The vertical component acts against the weight of the block, while the horizontal component acts to move the block. Show more…

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A contestant in a winter sporting event pushes a 45.0 -kg block of ice across a frozen lake as shown in Figure $5.21(\mathrm{a}).$ (a) Calculate the minimum force $F$ he must exert to get the block moving. (b) What is the magnitude of its acceleration once it starts to move, if that force is maintained?

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Key Concepts

Kinetic Friction

Kinetic friction acts on an object once it is already in motion, usually with a coefficient that is lower than that of static friction. This force opposes the motion and affects the net force available for acceleration, which can be analyzed using Newton's second law.

Newton's Second Law

Newton's second law relates the net force acting on an object to its mass and the acceleration that results (F_net = m*a). This law is fundamental for analyzing both the initiation of motion (overcoming static friction) and the subsequent acceleration of an object once it is moving.

Static Friction

Static friction is the resistive force that must be overcome to start moving an object at rest. It depends on the coefficient of static friction and the normal force between the surfaces in contact, and it determines the minimum force required to initiate motion.

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