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Assuming zero friction, the object will increase in velocity as long as an unopposed force is applied.

So long as the net force has a magnitude to overcome the static friction (and is constantly applied once the object is in motion) then the object will accelerate with respect to the difference between the force of kinetic friction and net force.

Force is measured in Newtons ((kg*(m/(s^2)) which is mass*acceleration) so the equation for force is F=m*a. To find the acceleration, the net force, F, divided by mass, m, will leave you with Newtons/mass on one side of the equation and acceleration on the other (m/(s^2)).

Example:

A 2kg block is pushed with a net force of 6N in one direction on a horizontal plane. The static friction constant between the block and the surface is 0.3 and the kinetic friction constant is 0.1.

The block has a weight of 19.6N (mass*gravity) and will have a normal force of the same value (Fn=W). The force required to put the object into motion will be (static friction constant)*Fn, or 19.6N*0.3 = 5.88N. Since this number is less than the net force applied to the block, the block will begin to move.

From this point on, if the force is constant, the net force in that direction will be higher (as the kinetic friction constant is smaller than the static friction constant). The new frictional force will be 19.6N*0.1 = 1.96N. Thus, the net force in the direction of motion is 4.04N. (4.04N)/(2kg) = 2.02 m/(s^2). The block will be moving at 2.02m/s at one second, 4.04 at two seconds and so on.

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Related Questions

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The velocity versus time graph of an object receiving an applied net force will show a linear increase or decrease in velocity, depending on the direction of the force.


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How does a change of velocity occur?

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