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Does the hand of an object moving at a uniform speed on the conveyor belt have the effect of friction,
It depends on whether it is horizontal motion. Horizontal things are not subject to friction. If it is not horizontal uniform motion, it is subject to friction. Friction is equal to the component of gravity in the direction of the conveyor belt. In short, uniform motion is that the force on the object is reasonably zero
The object moves downward at a uniform speed with the inclined conveyor belt. What is the direction of the friction force it receives? Why? How to judge?
At the same speed, if it moves at a uniform speed, then there is, and the component of friction and gravity is in balance
If the speed is the same and the speed is variable, there may not be. If the acceleration is the same, there will not be. If the acceleration is different, there will be
Objects on the plane are generally analyzed by the second method!
How to judge the direction of friction when an object moves with the conveyor belt from rest
When the conveyor belt tilts upward, the object tends to slide relative to the conveyor belt, and the friction force moves upward along the conveyor belt
When the conveyor belt moves obliquely downward: when the speed of the object exceeds the speed of the conveyor belt, the friction force moves downward along the conveyor belt; After the sliding speed exceeds the speed of the conveyor belt, the friction is upward along the conveyor belt
An object accelerates to the right on the conveyor belt. Where is the friction? Why?
Right. You think, the acceleration is due to the combined external force, right? The acceleration to the right is due to the combined external force to the right. The gravity support force is vertical, so it can only be provided by the horizontal friction to the right
The object is placed on the horizontal conveyor belt. When the conveyor belt suddenly moves to the right, where is the friction force on the object
To the right is opposite to the direction of the relative motion trend. You can assume that if there is no friction, the object will move to the left relative to the conveyor belt. The friction is opposite to him to the right
The direction of sliding friction is always opposite to the direction of motion of the object______ (right or wrong)
Sliding friction hinders relative motion and is opposite to the direction of relative motion of the object. Sometimes it is the same as the direction of motion of the object, so it is wrong to say opposite to the direction of motion of the object
So the answer is: ×
RELATED INFORMATIONS
- 1. Why can the direction of friction be perpendicular to the direction of motion of an object?
- 2. Determine the direction of friction Many books explain that a bicycle moves at a uniform speed when it is stepped on by people, so the front wheels are subject to backward friction The front wheel does not rotate forward as the rear wheel does. Why is the rear wheel backward and the front wheel ahead? thank
- 3. How to determine the direction of friction in physics?
- 4. How to prove the formula of the relationship between the radius of the inscribed circle and the trilateral of a right triangle?
- 5. Right triangle area formula
- 6. The centripetal force of an object in uniform circular motion is a constant force, right?
- 7. The resultant force of each force on an object moving in a uniform circular motion must be a centripetal force Why is it wrong
- 8. There are four line segments with the length of 1.2.3.4 respectively. The probability that any three of them will form a triangle is
- 9. If the three sides of an obtuse triangle are a + 1, a + 2 and a + 3, the value range of a is __
- 10. Four conditions for friction Is it 1. Objects contact and squeeze each other 2. The contact surface is not smooth 3. Relative motion or relative motion trend between objects 4. There is elasticity between objects
- 11. The object with mass m is stationary on the horizontal desktop, and the dynamic friction coefficient between the object and the desktop is μ， Now push the object with a horizontal force to accelerate the object for a period of time. Remove the force, and the object will slide for a period of time and then stand still. Given that the total distance of the object is s, what is the work done by this thrust to the object?
- 12. It is known that the circumference of an isosceles triangle is 30 cm and the length of one side is twice the length of the other. Find the length of its three sides
- 13. 7. The object with mass m is pulled by a string through a smooth small hole, and makes a uniform circular motion on a smooth horizontal plane. When the tension is a certain value f, it rotates When the tensile force is a certain value f, the rotation radius is R. when the tensile force gradually increases to 6F, the object still moves in a uniform circular motion. At this time, the radius is R / 2, then the work done by the tensile force on the object is: () A、0 B、FR C、3FR D、5FR/2
- 14. A small object with a mass of 0.05 kg is placed on a smooth horizontal table. One end of a rope is connected to the object, and the other end passes through the small hole in the center of the table. The object originally rotates on the circumference 0.2 m away from the hole at an angular speed of 3 rad / s. now pull the rope down slowly from the small hole to reduce the rotation radius of the object to 0.1 M. then the angular speed of the object
- 15. As shown in the figure, a small ball with a mass of M is hung with a thin rope with a length of L and placed on a smooth spherical surface with a radius of R. the minimum distance from the suspension point to the spherical surface is D, then how much pressure does the small ball have on the spherical surface? What is the tension of the rope?
- 16. How to describe the change of velocity direction with acceleration in uniform circular motion? In linear motion, it can be said that the speed increases or decreases by X meters per second, but what should be said when it is used to describe the change of speed direction? For example, how does acceleration describe the change of velocity direction in uniform circumferential velocity? Say the speed direction changes x degrees per second?
- 17. Friction direction of bicycle wheel Front and rear wheels. Explain why
- 18. On a straight road, athletes speed up on their bicycles. What is the direction of friction on the wheels The friction force on the front wheel is backward, and the friction force on the rear wheel is forward. Why,
- 19. What is the rolling friction coefficient of the aircraft on the ground
- 20. Physical friction coefficient On the plane, equal volume objects a, B and a are stacked on B. the weight of both objects is 10N, and the friction coefficient between each contact surface is equal to 0.3. At the same time, two horizontal forces with F = 1n act on a and B respectively. FA is horizontal to the right and FB is horizontal to the left. If both objects are stationary, the friction force between B and B on a is: A: 6N 3N B：1N 1N C:0N 1N D:0N 2N