Question

Nina and Jon are practicing an ice skating routine. Nina is standing still. Jon, who is twice as heavy as Nina, skates toward her, pushing Nina away with force f. Assuming the system is closed, which statement is correct about this system? A. Nina experiences a force equal to f. B. Nina experiences a force equal to f/2.

Answer 1

If the system is closed, Nina will experience only a force equal to F exerted by Jon.

According to Newton's third law of motion, action and reaction is equal and opposite. That is the force applied to a stationary object is equal to the reaction exerted by the stationary object.

Applying this law, the force Jon applied on Nina is equal to the reaction Nina exerts on Jon.

• If Jon exerts a force of F magnitude on Nina, consequently, Nina will experience the force of equal magnitude and exert equal reaction in opposite direction towards Jon.

• Also, if the system is closed, no additional force will be experienced by Nina, except the force applied by Jon.

Thus, assuming the system is closed, Nina will experience only a force equal to F exerted by Jon.

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