Question

Стеклянный кубик со стороной 20 см равномерно скользит по горизонтальной поверхности. Найдите силу трения, если она составляет 15% веса кубика.

Answer 1

Решение:Так как V-const, то Fp=0
Fтяж=Fтр
m=p(ро,плотность) × V
V=a×a×a=a³
V=20см³=800см³
m=2,5г/кг × 8000см³=20000г=20кг
P(вес) = 20кг × 10Н/кг = 200Н
Fтр= 0,15 × 200Н=30Н
Условие:
а=20см
F тр=0, 15
F тр-?
Решено верно!!





Объяснение:

Answer 2

Calculation of Frictional Force on a Glass Cube

To find the frictional force acting on a glass cube sliding on a horizontal surface, we need to consider the weight of the cube and the coefficient of friction.

Given: - Side length of the cube = 20 cm

We are told that the frictional force is 15% of the weight of the cube. To calculate the frictional force, we need to determine the weight of the cube.

Weight of the Cube

The weight of an object can be calculated using the formula:

Weight = Mass x Acceleration due to gravity

The mass of the cube can be calculated using the formula:

Mass = Density x Volume

Since the cube is made of glass, we can assume its density to be the density of glass, which is approximately 2.5 g/cm³.

The volume of the cube can be calculated using the formula:

Volume = Side length³

Let's calculate the weight of the cube:

Volume = (20 cm)³ = 8000 cm³

Mass = (2.5 g/cm³) x (8000 cm³) = 20000 g = 20 kg

The weight of the cube can be calculated as:

Weight = (20 kg) x (9.8 m/s²) = 196 N

Frictional Force

The frictional force can be calculated using the formula:

Frictional Force = Coefficient of Friction x Normal Force

The normal force is equal to the weight of the cube, which is 196 N.

Given that the frictional force is 15% of the weight of the cube, we can calculate the coefficient of friction:

Frictional Force = (15/100) x 196 N = 29.4 N

Therefore, the frictional force acting on the glass cube is 29.4 N.

Please note that the coefficient of friction was not provided in the question, so we cannot calculate it directly.