# Write an expression for the net work done on the block

How much work is done by an applied force to lift a Newton block 3. Two identical blocks, A and B, on a frictionless surface are connected by a spring of negligible Two identical blocks, A and B, on a frictionless surface are connected by a spring of negligible mass.

The spring is initially unstretched. During the interval from t1 to t2, block A is pushed through a distance dA by a hand exerting a force FA, as shown.

Block B is held in place by a wall.

• Calculating the Amount of Work Done by Forces
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The wall exerts a force on block B that varies with time but is always directed to the left. Is the work done on block A by the hand positive, negative, or zero? Is the work done on block B by the wall positive, negative, or zero?

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Write an expression for the net external work done on the system ABS by external forces in terms of given quantities i.

FA, fA, t1, t2. During the interval from t3 to t4, block A is again pushed a distance dA by a hand exerting a constant force FA. The wall exerts a force on the spring that varies with time but is always directed to the left. Let system AS consist of block A and the spring. Consider the interval from t3 to t4: Is the net external work done on system AS by external forces over this interval greater than, less than, or equal to that on system ABS over the interval from t1 to t2?

Write an expression for the work done on block A by the hand over this interval in terms of the given quantaties i. FA, fA, t3, t4.

What is the displacement of the left end of the spring during this interval? What is the displacement of the right end of the spring during this interval? Which of these displacements should be used to calculate the work done on the spring by the wall?

Is the work done on the spring by the wall positive, negative, or zero? Write an expression for the net external work done on system AS over this interval by external forces in terms of the given quantaties i.

If so, explain how. If not, resolve the inconsistency. Show transcribed image text Two identical blocks, A and B, on a frictionless surface are connected by a spring of negligible mass.Consider system ABS, which consists of block A, block B, and the spring.

Write an expression for the net external work done on system ABS by external forces in terms of given quantities (i.e., F A, d A, t 1, and/or t 2). Explain.

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The net external work on the system is just that due to the hand. W= F A d A. B%(45). Consider system ABS, which consists of block A, block B, and the spring. Write an expression for the net external work done on system ABS by external forces in terms of given quantities (i.e., F A, d A, t 1, and/or t 2). Explain. The net external work on the system is just that due to the hand. W= F A d A.

B%(45). Nov 04,  · Write an expression for the net external work done on system ABS by external forces The diagram shows block B resting against a wall, and block A being moved toward B, compressing the spring and moving displacement d A. Since the block is moving at a constant speed there is no change in kinetic energy.

## Calculating the Amount of Work Done by Forces

Since work is the change in kinetic energy and there is no change, the net work on the block is zero. Apr 02,  · Write an expression for the net work done on the block from the bottom to the top of the ramp.

Express your answer in terms of one or more of the following quantities: the weight mg of the block, the angle, the height H of the timberdesignmag.com: Resolved. If an object such as a block is lifted, work is done in order to move the block. The work, W, done by a force is defined as the component of the force that produces motion parallel to the direction of the motion (F||) times the displacement of the object on which work is being done, S, in that same direction: W = F|| S (eq.

5) A machine can be defined as any device that multiplies forces or changes the direction of .

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