Question

Автомобиль движется по горизонтальной дороге. как направлена сила трения, действующая на ящик в кузовеа) при разгонеб) при торможении)в) при равномером движении по прямому участку дорогиг)при повороте направоВо всех случаях ящик не скользит по кузову и не касается его бортов

Answer 1

A) проивоположно движению;
б) вперёд, по движению автомобиля;
в) равна нулю;
г) влево

Answer 2

Forces Acting on a Car on a Horizontal Road

When a car is moving on a horizontal road, there are several forces acting on it. One of these forces is the force of friction, which opposes the motion of the car. The direction of the frictional force depends on the situation.

a) During Acceleration: When the car is accelerating, the force of friction acts in the opposite direction to the motion of the car. This is because the force of friction tries to prevent the car from sliding or skidding. The frictional force helps the car gain traction and move forward. Therefore, the force of friction is directed opposite to the direction of acceleration.

b) During Braking: When the car is braking, the force of friction acts in the same direction as the motion of the car. This is because the force of friction helps the car slow down and eventually come to a stop. The frictional force is directed in the direction opposite to the car's motion.

c) During Uniform Motion on a Straight Road: When the car is moving at a constant speed on a straight road, the force of friction is directed opposite to the direction of motion. This is because the force of friction acts to counterbalance any external forces that might try to slow down or speed up the car. In this case, the frictional force is equal in magnitude and opposite in direction to the driving force applied to the car.

d) During a Right Turn: When the car is making a right turn, the force of friction acts towards the center of the turn. This is because the frictional force helps provide the necessary centripetal force to keep the car moving in a curved path. The frictional force is directed towards the center of the turn and perpendicular to the direction of motion.

In all cases, it is mentioned that the box in the car does not slide or touch the sides of the car. This implies that the force of friction between the box and the car's interior provides enough grip to prevent sliding or contact with the sides of the car.

Please note that the information provided above is based on general principles of physics and may vary depending on specific circumstances and conditions.

Answer 3

Forces Acting on a Car on a Horizontal Road

When a car is moving on a horizontal road, there are several forces acting on it. One of these forces is the force of friction, which opposes the motion of the car. The direction of the frictional force depends on the specific situation. Let's examine the different scenarios you mentioned:

a) During acceleration: When the car is accelerating, the force of friction acts in the opposite direction to the motion of the car. This is because the car is trying to move forward, but the frictional force tries to hold it back. The frictional force helps provide the necessary traction for the car to move forward.

b) During braking: When the car is braking, the force of friction acts in the same direction as the motion of the car. This is because the car is trying to slow down or stop, and the frictional force helps in decelerating the car.

c) During uniform motion on a straight road: When the car is moving at a constant speed on a straight road, the force of friction acts in the opposite direction to the motion of the car. This is to counteract any external forces that may try to slow down or speed up the car.

d) During a right turn: When the car is making a right turn, the force of friction acts towards the center of the turn. This is known as the centripetal force and is responsible for keeping the car on its curved path.

In all these cases, it is mentioned that the box in the car does not slide or touch the sides of the car. This suggests that the frictional force is sufficient to prevent the box from sliding or moving within the car's compartment.

Please note that the direction of the frictional force can vary depending on the specific circumstances, such as the condition of the road, the tires, and the weight distribution of the car. The information provided here is a general explanation, and the actual forces acting on a car can be more complex and dependent on various factors.