A rock with a weight of 10 N is resting on a table. A student makes a number of

Question

A rock with a weight of 10 N is resting on a table. A student makes a number of statements about this situation. "The weight of the rock is a force of 10 N by gravity in the downward direction." What, if anything, is wrong with this statement? If something is wrong, identify it and explain how to correct it. If this statement is correct, explain why. "The reaction force to this weight is a force of 10 N exerted on the rock by the table in the upward direction." What, if anything, is wrong with this statement? If something is wrong, identify it and explain how to correct it. If this statement is correct, explain why. "The normal force exerted on the rock by the table is a force of 10 N; the reaction force to this normal force is a force of 10 N exerted on the rock by the gravity in the downward direction." What, if anything, is wrong with this statement? If something is wrong, identify it and explain how to correct it. If this statement is correct, explain why. "If the 10 N rock is lifted off the table by a hand that exerts a force of 12 N upward on the rock, the reaction force to this 12 N force is a force of 10 N exerted on the hand by the rock in the downward direction." What, if anything, is wrong with this statement? If something is wrong, identify it and explain how to correct it. If this statement is correct, explain why.

Explanation / Answer

1) the first statement is true

as the weight of the rock acts in the downwards direction and its value is equal to 10 N

2) this is true

because of newtons third law, every action has equal and opposite reaction

so there will be reaction force of 10 N by the ground on the rock in upward direction

3) true

4) false.

the reaction force would be the net force acting on the rock and will be equal to(12-10)N = 2N

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