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Hold your open hand at shoulder-height, and have your associate carefully place a Bowling ball in your hand. Now allow the hand and bowling ball to descend slowly to the floor. Your hand has done 'negative work', equal to the (weight of the ball) times (distance it descended).
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∙ 15y ago
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When work is positive and when is negative?
when work is positive and when playing is negative
Can work positive or Negative in physics how?
Yes Work can be positive or Negative.
How can you have both positive and negative work at the same time?
Very interesting approach! When Paul presses a spring then work done by Paul is positive and work performed by spring is negative. As per scalar product we have to use cos@ If @ is acute then cos @ is +ve and if @ is obtuse then it becomes -ve As force applied and displacement are in the same direction as in the case of Paul's attempt then work becomes positive But in case of spring's opposing force the displacement is in opposite direction and so work is negative
What are positive and negative work ethics?
what is positive and negative
Can scalar product of two vectors be negative?
The scaler product of two vector can be negative,if the angle b/w two vector is 180 or two vector or antiparallel to each otherA.B=ABcosA.B=ABcos180A.B=-ABTHIS SHOW THAT SCALER PRODUCT OF TWO VECTOR CAN BE NEGATIVE.EXAMPLE::Work done against force of friction: w=f.dw=fbcosw=fbcos180w=-fb:Work done against gravity:w=f.dhere f=mg and d=hso putting valuew=mghcosw=mghcos180w=-mghHENCE WORK DONE AGAINST FORCE OF GRAVITY IS NEGATIVE
Can work done by a force be negative?
Yes. If force is negative, then work will be negative.
How do you determine a work done is positive sign or negative sign?
If work is done on the system then it has a negative sign. If work is done by the system then it has a positive sign.
Can total work done on an object negative?
Yes, the total work done on an object can be negative. This occurs when the force applied to the object is in the opposite direction to the displacement of the object. In this case, the work done is considered negative.
What can be said about a situation in which work done is negative?
the formula F.S cos angle is used (the dot product) so if angle is 0,cos angle=1 hence work done is positive and maximum if angle is 90 so cos 90 is 0 hence work done is minimum if work done is negative the angle is 180 The work done by friction is always negative (opposite the force) Since work is force x displacement, a negative value for work could mean that the displacent was negative
Is the work done by the system is considered as positive or on the system is considered as positive?
In thermodynamics, work done by the system is considered positive. Work done on the system is considered negative.
When negative work is being done what happens to potential energy?
Negative work increases potential energy.
When do you say that the work done is positive or negative?
Work done is considered positive when the force applied and the displacement of the object are in the same direction, causing movement in that direction. On the other hand, work done is considered negative when the force applied and the displacement are in opposite directions, resulting in work being done against the direction of the force.
When swimming work done is positive or negative?
Positive.
When you say work is done against a force you mean the force does?
Negative work
What is the difference between negative work and zero work and positive work done?
If the angle between the displacement and force applied is less than a right angle, then it is Positive Work done. If the angle between the displacement and the force applied is greater than a right angle then it is Negative Work done. If the displacement and force are at right angles, or either is zero, then it is Zero Work done.
When negative work is done on a moving object it's kenetic energy?
When negative work is done on the object, the object's energy decreases. This MAY be kinetic energy, but some other form of energy may increase instead, for example, potential energy or heat energy.
If you push on a box but the box moves backward you have done work?
Yes.
