It is known that a lab cart is moving east at 25 cm/s at time t1 = 0.10 s, and then moving east at 15 cm/s at t2 = 0.20 s. Is this enough information to determine the direction of the net force acting on the cart between t1 and t2? Yes, since we know the cart is slowing down, its momentum change is opposite the direction of movement, and the net force is in the direction of momentum change. No, because we don’t know whether forces such as friction or air resistance might be acting on the cart. No, because we don’t know the mass of the cart. Yes, since we know the cart keeps moving to the east, the net force must be in the direction of motion.

It is known that a lab cart is moving east at 25 cm/s at time t1 = 0.10 s, and then moving east at 15 cm/s at t2 = 0.20 s. Is this enough information to determine the direction of the net force acting on the cart between t1 and t2? Yes, since we know the cart is slowing down, its momentum change is opposite the direction of movement, and the net force is in the direction of momentum change. No, because we don’t know whether forces such as friction or air resistance might be acting on the cart. No, because we don’t know the mass of the cart. Yes, since we know the cart keeps moving to the east, the net force must be in the direction of motion.

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter9: Momentum And Its Conservation

Section9.1: Impulse And Momentum

Problem 2PP

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