Two forces are applied to a cart with two different spring scales as shown below
ID: 1330900 • Letter: T
Question
Two forces are applied to a cart with two different spring scales as shown below. The spring scale FA reads 15 N. The cart had an initial velocity of 0.00 m/s when the two forces were applied. It remains at rest after the combined forces are applied. What is the net force on the cart? What does spring scale FB read? Show your calculations and explain. The cart had an initial velocity of + 0.75 m/s and so it was moving to the right when the two forces were applied. It continues moving to the right at that same velocity after the combined forces are applied. What is the net force on the cart? What does spring scale FB read? Show your calculations and explain. The cart had an initial velocity of - 039 m/s and so it was moving to the left when the two forces were applied. It continues moving to the left at that same velocity after the combined forces are applied. What is the net force on the cart? What does spring scale FB read? Show your calculations and explain. Which of NewtExplanation / Answer
(a)
As the velocity has not changed after the application of the combined force, the acceleration should be zero.
=> Net force is 0
=> Fa + Fb = 0
=> Fb = - 15 i N
(b)
Even though the cart has some initial velocity, it's velocity didn't change after application of the combined forces.
This implies, acceleration is 0 in this case also.
=> Net force is 0
=> Fa + Fb = 0
=> Fb = -15 i N
(c)
Same answer as above (exactly same answer of b)
(d)
To determine the Net force we have used Newton's first law of motion. As, the net force is zero, the cart continued to be rest or in uniform motion (with out change in velocity)
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