1) write the unit and symbol of work done?
2) write the mathematical expression and its components of work done?
3)what will be the work done if the angle between force and displacement will be 90°?
4)what will be the work done if the angle between force and displacement will be 0°?
5)what will be the work done if the angle between force and displacement will be 180°?
6) what is positive and negative work done?
7) give two example of 0 work done?
8) what what is work done against gravity?
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Answers
Answer:
Explanation:
SI unit joule (J)
Other units Foot-pound, Erg
In SI base units 1 kg⋅m2⋅s−2
Derivations from other quantities W = F ⋅ s W = τ θ
3.w=fscos90=0 cos90=0 means if force perpendicular than not work
4 w=fscos0=fs cos0=1
5 w=fscos180=-fs cos180=-1 work oposit
6 Work can be either positive or negative: if the force has a component in the same direction as the displacement of the object, the force is doing positive work. If the force has a component in the direction opposite to the displacement, the force does negative work.
7 Work was done the gravity on a rocket going perpendicular upwards. Zero work: When force and displacement are perpendicular to each other, or when force or displacement is zero.
8 Work done against gravity - gravitational potential energy. ... So if an object of mass m is raised through a height h, the work done on the object is equal to mgh, and so this amount of energy is transferred to the object.