An object with a mass of #2 kg# is moving at #7 m/s# over a surface with a kinetic friction coefficient of #1 #. How much power will it take to accelerate the object at #4 m/s^2?
1 Answer
The power that much be supplied at the moment
Explanation:
The power expended on an object can be found by multiplying the force applied to the object by the speed of the object's motion.
To cause acceleration of
Since there is a frictional force present, this net force is composed of two separate forces
where the force of friction will equal
So,
"F_"applied"= 8 + 19.6 = 27.6N#
At the moment the acceleration begins,
Note that as the speed increases, the power required to maintain this acceleration will increase, so the above answer is true only at the moment v = 7 m/s.