![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
The centripetal force of an object in uniform circular motion is a constant force, right?
Not constant force
Because the direction of the force has changed
Can an object in uniform circular motion be said to be affected by centripetal force? Can we say that the object in circular motion is acted by centripetal force?
No centripetal force is provided to him by other objects
As long as a body is subjected to a centripetal force, the body moves in a uniform circular motion Is that right?
No, it may be circular motion under the action of centripetal force, but the speed is not necessarily constant, so it is not necessarily uniform
Centripetal force is the resultant force on a circular object, right
No, it should be said that the centripetal force is the resultant force on an object moving in a circular motion at a uniform speed
The resultant force on an object in circular motion must be centripetal force Why is this sentence wrong
Not necessarily, if it is a uniform circular motion, the resultant force on the object is a centripetal force;
If it is a variable speed circular motion, it is subject to a tangential component in addition to the centripetal force
[physics, uniform circular motion] why? If an object moves in a uniform circular motion, its centripetal force is the resultant force Tell me why? 1. If an object moves in a uniform circular motion, its centripetal force is the resultant force 2. The resultant force of all forces on a circular object must be centripetal force
1. We use a lot of theories and facts to prove that when an object moves in a uniform circular motion, the acceleration points to the center of the circle and the resultant force points to the center of the circle. Because this resultant force always points to the center of the circle, we also refer to the resultant force at this time as "centripetal force" in effect. Therefore, the centripetal force is not a new force, but only the effect of the resultant force at this time. The first sentence is right
2. The resultant force of uniform circular motion must point to the center of the circle. But the resultant force of general circular motion does not necessarily point to the center of the circle. So the second sentence is wrong. At this time, the centripetal force is only part of the resultant force
RELATED INFORMATIONS
- 1. The resultant force of each force on an object moving in a uniform circular motion must be a centripetal force Why is it wrong
- 2. 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
- 3. If the three sides of an obtuse triangle are a + 1, a + 2 and a + 3, the value range of a is __
- 4. 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
- 5. Are the objects on the horizontal conveyor belt subject to friction The conveyor belt is horizontal with an object moving forward at a uniform speed. Is this object subject to friction? If it's moving from rest to uniform speed, is there friction
- 6. As shown in Figure 2, a disk rotates at a uniform speed around the vertical axis passing through the center in the horizontal plane, and a small object on the disk is stationary relative to the disk and moves with the disk. The centripetal force on the object is correct in the following statement: a A. The direction of the centripetal force points to the center of the disc B. the direction of the centripetal force is the same as the speed direction of the object C. The centripetal force direction is parallel to the rotating shaft D. the centripetal force direction remains unchanged The disc rotates counterclockwise
- 7. When the wood block with mass of M = 1kg is stationary on the platform with height of H = 1.2m, the dynamic friction coefficient between the wood block and the platform As shown in the figure, the wood block with mass of M = 1kg is still at the height of H = 1.2m Dynamic friction coefficient between wood block and platform on platform μ= 0.2, with horizontal thrust f = 20n, Remove the wood block when it has a displacement of S1 = 3M, and fly out of the platform when it slides again and S2 = 1m, Find the speed of the wooden block when it falls to the ground? ( )
- 8. As for friction, the correct one in the following statement is () A. The direction of sliding friction is always opposite to the direction of motion of the object B. Sliding friction always hinders the relative motion between objects C. The magnitude of the friction force must be proportional to the pressure between the contact surfaces D. The direction of friction can be perpendicular to the direction of motion of the object
- 9. Why should the trajectory of the particle with the longest flight time in a magnetic field be tangent to the boundary of the magnetic field
- 10. The wood block with mass m is placed on a smooth horizontal plane, and the bullet with mass m is fired in the horizontal direction at velocity V0 and finally remains in the wood block and moves with the wood block in V A,FL=1/2Mv2 B.Fs=1/2mv2 C.Fs=1/2mv02-1/2(M+m)v2 D.F(L+s)=1/2mv02-1/2mv2 The wood block with mass m is placed on a smooth horizontal plane, and the bullet with mass m is fired in the horizontal direction at velocity V0 and finally remains in the wood block and moves with the wood block in V. It is known that when the bullet is stationary relative to the wood block, the wood block advances L, and the depth of the bullet entering the wood block is s. if the resistance F of the wood block to the bullet is constant, then
- 11. Right triangle area formula
- 12. How to prove the formula of the relationship between the radius of the inscribed circle and the trilateral of a right triangle?
- 13. How to determine the direction of friction in physics?
- 14. 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
- 15. Why can the direction of friction be perpendicular to the direction of motion of an object?
- 16. Does the hand of an object moving at a uniform speed on the conveyor belt have the effect of friction,
- 17. 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?
- 18. 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
- 19. 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
- 20. 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