Question

После отталкивания фигуристы останавливаются через 10 с. Определить средние значения величины сил трения, действовавших на каждого из спортсменов.Рост фигуриста 170, вес 70Рост фигуристки 160, вес 50

Answer 1

V1/t=a1
F1=m1*a1=m1*v1/t ********** масса и время известны, скорость неизвестна *****
F2=m2*v2/t************ масса и время известны, скорость неизвестна *****

Answer 2

Calculation of Average Frictional Forces on Figure Skaters

To determine the average values of the frictional forces acting on each of the figure skaters, we need to consider their respective heights and weights. The frictional force can be calculated using the formula:

Frictional force = coefficient of friction × normal force

The normal force is equal to the weight of the skater, which can be calculated as:

Normal force = mass × acceleration due to gravity

Let's calculate the average values of the frictional forces for both the male and female figure skaters.

For the male figure skater: - Height: 170 cm - Weight: 70 kg

For the female figure skater: - Height: 160 cm - Weight: 50 kg

Calculation for the Male Figure Skater:

1. Calculate the normal force: - Mass = 70 kg - Acceleration due to gravity = 9.8 m/s^2 - Normal force = mass × acceleration due to gravity

Normal force = 70 kg × 9.8 m/s^2 = 686 N

2. Calculate the coefficient of friction: - Since the coefficient of friction is not provided, we will assume a typical value for the coefficient of friction between ice and skates, which is around 0.02.

Coefficient of friction = 0.02

3. Calculate the frictional force: - Frictional force = coefficient of friction × normal force

Frictional force = 0.02 × 686 N = 13.72 N

Therefore, the average value of the frictional force acting on the male figure skater is approximately 13.72 Newtons.

Calculation for the Female Figure Skater:

1. Calculate the normal force: - Mass = 50 kg - Acceleration due to gravity = 9.8 m/s^2 - Normal force = mass × acceleration due to gravity

Normal force = 50 kg × 9.8 m/s^2 = 490 N

2. Calculate the coefficient of friction: - Assuming the same coefficient of friction of 0.02 for the ice-skate interface.

Coefficient of friction = 0.02

3. Calculate the frictional force: - Frictional force = coefficient of friction × normal force

Frictional force = 0.02 × 490 N = 9.8 N

Therefore, the average value of the frictional force acting on the female figure skater is approximately 9.8 Newtons.

Please note that the values calculated above are approximate and based on assumptions regarding the coefficient of friction. The actual values may vary depending on various factors such as the condition of the ice and the skates.