aced on may negleet frictional forces in any of the subsequent situations. For e

Question

aced on may negleet frictional forces in any of the subsequent situations. For each situation, determine the net force, from the following track; you may A fancart is choices, that would result in the motion described. Possible choices: A. An increasing net force to the left B. A constant net force to the left D. A constant net force to the right F. None of these i. The fancart moves to the left at constant velocity oing et force to the right Hint: What does the momentum principle (Newon's Second Law) tell you about the relationship between the net force and the resulting motion? Incorrect. Tries 2/3 Previous Tries ii·The fancart moves to the right with a steadily increasing velocity (constant acceleration). u are co Your receipt no. is 158-9872 Previous Tries ii. The fancart moves to the right and slows down steadily (constant acceleration). Hint: What does the momentum principle (Newton's Second Law) tell you about the relationship between the net force and the resulting motion? Incorrect. Tries 2/3 PreviousTries

Explanation / Answer

Here are important points - When a body is moving at constant velocity, it has zero acceleration, it means no net force acts on it. Net force is zero.

If we need to stop something steadily and slowly, we need to apply a constant force in the opposite direction of motion. If we need to accelerate something at constant rate, then we need to apply a constant force in the direction of force.

Now, In the fan cart problem

1) moves to right at constant velocity means no acceleration means no net force

2) you already got it right. As it is having constant acceleration, it means a constant force is acting in the direction of motion.

3) Now, cart is getting slow at constant rate, we must apply a constant force to the left.

coming to graph problems -

1 ) constant acceleration means a constant net force means a straight line in the positive direction. Choice A matches this.

2) car is slowing down at constant rate means a net constant force is acting to the left. Choice B

3) Car moves at constant velocity to the left means no net force. Choice E. here the line of net force is on the zero line means no net force.

4) Car is speeding up means an increase in net force then slowing down...Choice F matches this as the curve is decreasing .

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