a. Derive the formula for the kineticenergy of an object of mass m, moving with velocity v.
b. Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
c. Why is the work done on an object moving with uniform circular motion zero?
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The formula for kinetic energy is: KE=1/2 mv² , where m is the object's mass and v is its velocity.
W=F×Scosθ
Here , θ=30
∘
thus, W=F×S=
2
3
Force in uniform circular motion is always perpendicular to the displacement and hence the angle between F and S is 900 always. After putting the value of θ. W=0. Hence, The work done in a uniform circular motion is always zero.
×F×St
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Answer:
The formula for kinetic energy is: KE=1/2 mv² , where m is the object's mass and v is its velocity.