Question

2.9. Шайба, пущенная по поверхности льда с начальной скоростью v0=20 м/с, остановилась через t=40 с. Найти коэффициент трения f шайбы о лед Можно каждое действие с пояснениями

Answer 1

1) Тормозящее ускорение шайбы a=V-V0/t (V=0) a=-V0/t
2) Шайба движется под действием силы трения Fтр=-u*m*g
3) По второму закону Ньютона m*a=Fтр
Имеем m*V0/t=u*m*g
u=V0/g*t=20/10*40=0,05

Answer 2

Calculation of the Coefficient of Friction between the Puck and the Ice Surface

To find the coefficient of friction (f) between the puck and the ice surface, we can use the following equation:

v = v0 - ft

Where: - v is the final velocity of the puck (0 m/s, as it comes to a stop) - v0 is the initial velocity of the puck (20 m/s) - f is the coefficient of friction between the puck and the ice surface - t is the time taken for the puck to come to a stop (40 s)

Rearranging the equation, we get:

f = (v0 - v) / t

Substituting the given values, we have:

f = (20 m/s - 0 m/s) / 40 s

Simplifying the equation, we find:

f = 0.5

Therefore, the coefficient of friction between the puck and the ice surface is 0.5.

Please note that the sources provided do not contain specific information related to this calculation. However, the calculation is based on the principles of physics and the equation for calculating friction.