Question

Конькобежец массой 70кг скользит по льду. Чему равна сила трения, действующая на конькобежц, если коэффициент трения коньков по льду равен 0.02?

Answer 1

Fтр=мю*F=0.02*70кг*10м/с^2=14Н

Answer 2

Calculating Frictional Force on the Speed Skater

To calculate the frictional force acting on the speed skater, we can use the formula:

Frictional force = coefficient of friction × normal force

Given: - Mass of the speed skater (m) = 70 kg - Coefficient of friction (μ) = 0.02

Calculating the Normal Force

The normal force can be calculated using the formula:

Normal force = mass × acceleration due to gravity

The acceleration due to gravity is approximately 9.81 m/s^2.

Calculation

Using the given mass of the speed skater and the acceleration due to gravity, we can calculate the normal force:

Normal force = 70 kg × 9.81 m/s^2

Solution

Normal force = 686.7 N

Calculating Frictional Force

Now, we can calculate the frictional force using the coefficient of friction and the normal force:

Frictional force = 0.02 × 686.7 N

Solution

Frictional force ≈ 13.734 N

Therefore, the frictional force acting on the speed skater is approximately 13.734 Newtons.