Concept explainers
Whether the force acting or not when the coffee cup sits motionlessly on tray and how it differs from the force when cup is placed on the kitchen table at home.
Explanation of Solution
Introduction:
Newton’s first law of motion defines that an object remains in the state of rest or the state of motion in the same direction unless an external force act upon it.
The forces that are acting on the coffee cup placed over tray are the normal forces exerted by the table on the cup and the gravitational pull of the Earth. The cup placed on the table in the plane is stationary with respect to the surface, as like the cup in the kitchen, which is also stationary with respect to the surface. In both cases, the cup is not accelerating relative to the ground.
Thus, the forces acting upon the cup are the normal forces and the gravitational forces of the Earth. The force on the cup is the same if the table and the cup are in the kitchen as the cup will still be stationary with respect to the ground.
Conclusion:
Therefore, the forces are acting on the cup and they will be same even if the cup is placed on the kitchen table.
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Chapter 4 Solutions
Physics for Scientists and Engineers
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