Horizontal Pulley Question: 1.You are supposed to start the system at rest. If t

Question

Horizontal Pulley Question:

1.You are supposed to start the system at rest. If the cart is initially moving with some vo, what would happen to T, the magnitude of the tension in the cord, and a, the magnitude of the acceleration of the cart? (choose one answer)

A.T remains the same, a decreases

B. both T and a increase

C. both T and a remain the same

D. T decreases, a decreases

E. both T and a decrease

F. T increases, a remains the same

G. T remains the same, a increases

H. T decreases, a remains the same

I. T increases, a decreases

2. Suppose now there is significant friction between the cart and the track (but no friction anywhere else). What would happen to T, the magnitude of the tension in the cord, and a, the magnitude of the acceleration of the cart? (choose one answer)

A. T remains the same, a increases

B. both T and a increase

C. T increases, a remains the same

D. both T and a remain the same

E. T decreases, a increases

F. T remains the same, a decreases

G. both T and a decrease

H. T decreases, a remains the same

I. T increases, a decreases

A.T remains the same, a decreases

B. both T and a increase

C. both T and a remain the same

D. T decreases, a decreases

E. both T and a decrease

F. T increases, a remains the same

G. T remains the same, a increases

H. T decreases, a remains the same

I. T increases, a decreases

2. Suppose now there is significant friction between the cart and the track (but no friction anywhere else). What would happen to T, the magnitude of the tension in the cord, and a, the magnitude of the acceleration of the cart? (choose one answer)

A. T remains the same, a increases

B. both T and a increase

C. T increases, a remains the same

D. both T and a remain the same

E. T decreases, a increases

F. T remains the same, a decreases

G. both T and a decrease

H. T decreases, a remains the same

I. T increases, a decreases

Explanation / Answer

A.T remains the same, a decreases

I. T increases, a decreases

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