At one particular moment, a 19.0 kg toboggan is moving over a horizontal surface of snow at 3.60 m/s. After 6.75 s have elapsed, the toboggan stops. Use a momentum approach to find the magnitude of the average friction force (in N) acting on the toboggan while it was moving.

Friction force acting on the toboggan is  10.13 N.

Explanation:

Momentum is defined as the product of mass and its velocity,i.e,

p = m × v

Thus, initial momentum will be :-

p₁ = 19.0 × 3.60

    = 68.4 kg m/s

Final momentum will be ;_

p₂ = 19.0 × 0

   = 0 kg m/s

Now, Force is defined as the rate of change of linear momentum,i.e,

F = dp/dt

Thus, F =

            =

            = - 10.13 N

Negative sign just signifies that force is acting in a direction opposite to the direction of motion.

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