18. i. Define work done and its SI unit.
ii. Express work mathematically.
iii. State the conditions for Zero work done.
iv. Name the term used for the sum of kinetic energy and potential energy
Answers
Answer:
i) "Work done is defined as the amount of force required to move one N (Newton) through the displacement of 1 M (metre). The SI unit of work is Joule which is denoted by the abbreviation ""J." Work is the measure that defines most of the things that is related to physics.
ii) To express this concept mathematically, the work W is equal to the force f times the distance d, or W = fd. If the force is being exerted at an angle θ to the displacement, the work done is. W = fd cos θ.
iii) Zero work is done when the displacement of a body is zero or perpendicular (θ=900,cosθ=0) to the direction of force applied, then work done is zero. For example, if a person tries to push a wall, he is applying force yet the wall does not move, so the displacement of the wall is zero, and hence work done is zero.
iv) The total amount of mechanical energy is merely the sum of the potential energy and the kinetic energy. This sum is simply referred to as the total mechanical energy (abbreviated TME).
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Answer:
1.) Work is said to be done when the force applied on an object produces a displacement of the object in the direction of force applied .SI unit of work is joule.
2.) The work W is equal to the force f times the distance d, or W = fd. If the force is being exerted at an angle θ to the displacement, the work done is W = fd cos θ.
3.) When force and displacement are perpendicular to each other, or when force or displacement is zero.