It is known that a lab cart is moving east at $$\(25 \mathrm{~cm} / \mathrm{s}\)$$ at time $$\(t_{1}=0.10 \mathrm{~s}\)$$, and then moving east at $$\(15 \mathrm{~cm} / \mathrm{s}\)$$ at $$\(t_{2}=0.20 \mathrm{~s}\)$$. Is this enough informa- tion to determine the direction of the net force acting on the cart between $$\(t_{1}\)$$ and $$\(t_{2}\)$$ ?
A.
Yes, since we know the cart is slowing down, its momentum change is opposite the direc- tion of movement, and the net force is in the direction of momentum change.
B.
No, because we don't know whether forces such as friction or air resistance might be acting on the cart.
C.
No, because we don't know the mass of the cart.
D.
Yes, since we know the cart keeps moving to the east, the net force must be in the direction of motion.
Exam No：AP Physics 1 Problem Set 1 Year：2024 Question No：31
Answer:
A
Knowledge points:
2.6 Newton’s Second Law
2.7 Applications of Newton’s Second Law
Solution:
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