A block rests on the floor. Two forces act, one is downward gravitational force and second one is upward reaction force by the floor. These two forces:

have equal magnitudes and the same direction

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have equal magnitudes but opposite directions

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have unequal magnitudes and the same direction

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have unequal magnitudes and opposite directions

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None of these

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Solution

The correct option is B have equal magnitudes but opposite directions
The magnitude of the gravitational force = The magnitude of the reaction force (As the block has no motion in the vertical direction)
the gravitational force is acting downwards whereas the reaction force is acting upwards.

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Newton’s third law of motion states that for every action, there is an equal and opposite reaction.

Which of the following statement can be inferred from the above-mentioned law of motion?

Statement 1 $:$ In every interaction, there is a pair of forces acting on the two interacting objects.

Statement 2 $:$ The magnitude of the force on the first object equals the magnitude of the force on the second object.

Statement 3 $:$ Forces always come in pairs - equal and opposite action-reaction force pairs.

Statement 4 $:$ Force and reaction act on the same body.

Statement 5 $:$ Force and reaction act on two different bodies.

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