Concept explainers
(a)
Check whether the puck move or not due to
(a)
Answer to Problem 142P
Puck will not move.
Explanation of Solution
The mass of puck is
The puck will move or not depends on whether the applied force is greater than or lesser than that of the frictional force between the puck and the board. The puck will move if the applied force is greater than that of the frictional force.
Write the expression to calculate the frictional force between the puck and the board.
Here, the maximum value of static frictional force between the puck and the board is
Write the equation for
Here, the mass of puck is
Rewrite the equation for
Conclusion:
Substitute
It is found that
Therefore, the puck cannot move with
(b)
Check whether the puck move or not due to
(b)
Answer to Problem 142P
Puck will move.
Explanation of Solution
The mass of puck is
The puck will move or not depends on whether the applied force is greater than or lesser than that of the frictional force between the puck and the board. The puck will move if the applied force is greater than that of the frictional force.
Write the condition for the puck to move
Here, the applied force is
Conclusion:
Substitute
It is found that
Therefore, the puck cannot move with
(c)
Check whether the puck move or not due to
(c)
Answer to Problem 142P
Puck will move.
Explanation of Solution
The mass of puck is
Write the equation for net force on the puck.
Here, the acceleration of puck is
Conclusion:
Substitute
Therefore, the puck can move.
(d)
Whether the acceleration of puck will be same, lesser than, or greater than that of in earth for the same applied force.
(d)
Answer to Problem 142P
Acceleration of puck will be greater in moon that in earth.
Explanation of Solution
The mass of puck is
Write the equation for net force on the puck.
Rewrite the above relation in terms of
From the above equation it can be seen that the acceleration of puck depends on the gravitational acceleration exerted on puck.
Rewrite the above equation for puck in moon.
Here, the acceleration of puck in moon is
The value of
Conclusion:
Therefore, the acceleration of puck will be greater in moon that in earth.
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Chapter 4 Solutions
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