An elevator is being pulled up from the ground floor to the third floor by a cable. The cable is exerting 4500 newtons of force on

Question

An elevator is being pulled up from the ground floor to the third floor by a cable. The cable is exerting 4500 newtons of force on the elevator. According to Newton’s law of action-reaction, what is the gravitational force on the elevator and the people in it, in newtons, if the elevator is not accelerating?

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taiduc · Answer

Answer:   The gravitational force on the elevator = 4500N          The given parameters are;      The force applied by the elevator, F  = 4500 N      The acceleration of the elevator = Not accelerating      From Newton's third law of motion, the action of the cable force is equal to the reaction of the gravitational force on the elevator which is the weight, W and motion of the elevator as follows;      F = W + Mass of elevator × Acceleration of elevator      ∴ F = W + Mass of elevator × 0 = W      F = 4500 N = W      The net force on the elevator is F - W = 0      The gravitational force on the elevator = W = 4500N.

Vodka · Answer

Answer:     The gravitational force on the elevator = 4500N                        The given parameters are;            The force applied by the elevator, F  = 4500 N            The acceleration of the elevator = Not accelerating            From Newton's third law of motion, the action of the cable force is equal to the reaction of the gravitational force on the elevator which is the weight, W and motion of the elevator as follows;            F = W + Mass of elevator × Acceleration of elevator            ∴ F = W + Mass of elevator × 0 = W            F = 4500 N = W            The net force on the elevator is F - W = 0            The gravitational force on the elevator = W = 4500N.

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