Can you please Help me with this question A person pulls equally hard on two mas
ID: 1318981 • Letter: C
Question
Can you please Help me with this question
A person pulls equally hard on two masssless strings that are attached to a block.the strings remain taut and symmetrical,forming the same angle with the horizontal at all times.
A- What is the direction of acceleration when
i. block speeds up while moving downward
ii.block slows down while moving downward?
iv.block speeds up while moving upward?
iiv.. block slows down while moving upward?
B-What is the direction of net force for each of these motions?
C-Explain the reasoning to determine the net force for each of the four motions
D- Draw and label a free-body diagram for the block ofr each of the four motions.indicate the releative magnitudes of the forces by the relative lengths of the forces vectors. Draw all diagrams to the same scale.
F- Consider the following statment made by a student about each of the four motions in problem 1.
" the magnintuade of the forces exerted by the block on an individual string is the same as the magnituade of the exerted by that string on the block. They are a third law force pair. So I don't understated why the block doesn't move at a constant speed if that is true."
The student has correctly identified a newton's third law. Explain why this does not mean that the block must move at constant speed?
Explanation / Answer
1), Acceleration is basically the rate of change of velocity.
(i). When the box is speeding in downward direction then net acceleration is acting in downward direction.
(ii). When the box slows down in downward direction then decceleration or negative acceleration is acting on it in downward direction in direction of motion. Or in a way we can say that acceleration is acting on it in upward direction.
(iii). When the box is speeding up in upward direction then net acceleration is acting in upward direction.
(iv). When the box slows down in upward direction then decceleration or negative acceleration is acting on it in upward direction in direction of motion. Or in a way we can say that acceleration is acting on it in downward direction.