A 40.-kilogram mass is moving across a horizontal surface at 5.0 meters per second. what is the magnitude of the net force required to bring the mass to a stop in 8.0 seconds?

Question

Alexa Freeman

Physics

6 April, 07:48

A 40.-kilogram mass is moving across a horizontal surface at 5.0 meters per second. what is the magnitude of the net force required to bring the mass to a stop in 8.0 seconds?

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Stinky · Answer 1

From newtons second law of motion the rate of change of linear momentum is proportional to the resultant force. Momentum is the product of mass and the speed of a body.

In this case Momentum is 40 kg * 5 m/s = 200 kgm/s

From the same law we deduce that impulse (Ft) is equal to the change in momentum. Therefore, Ft = change in momentum.

Hence, to get the impulsive force we divide the change in momentum by time.

F = 200kgm/s : 8 sec = 25 N

hence the force is 25 N