e. If an object has 0 momentum, does
it have kinetic energy? Explain your
answer.
f. Why is the work done on an object
moving with uniform circular
motion zero?
Answers
Explanation:
❤hello ❤
Your answer
e.....An object can have zero momentum when either its mass or its velocity is zero. Since, negetive mass doesn't exist, the velocity should be zero and thus, the object must be at rest. ... If the velocity is zero, the momentum and the KE will be zero. Hence if an object has zero momentum, it will have no kinetic energy.
f...For an object moving in uniform circular motion, the only force is the centripetal force, which points in a direction along the radius of the circle, and since the radius of the circle never changes, there is no displacement along this direction, and the work done by this force is zero.
answer by ❤gentryamansharma ❤
e.
No, it does not have kinetic energy if it does not have momentum.
Momentum is the product of mass and velocity. If it is zero, it implies that v= 0 (since mass can never be zero).
Now K.E= ½ mv² So if v= 0 then K.E also will be zero.
Thus, if an object has no momentum then cannot possess kinetic energy.
f.
When a body performs uniform circular motion, then the force acting on it is along the radius of the circle.
While it's displacement is along the tangent to the circle. Thus they are perpendicular to each other.
Hence theta= 90° and cos 90= 0
W= Fs cos theta= 0