A person running he does a circular motion what provides centripetal force

None of the above is true, if a person does a circular motion while running, the static friction force acts as a centripetal force.

First of all, analyze the force of the human hand, 1Subjected to gravity pointing straight downwards.

2.Vertically upwardly supported (elastic force perpendicular to the contact surface, where the sole is in contact with the ground and the contact surface is horizontal).

3.Subjected to static friction.

As you can see, only static friction provides normal acceleration (acceleration along the radius towards the center of the circle).

I'll give you another explanation, what is wrong with them.

15015838716 said: The human body needs to tilt to break down the horizontal force, and the reaction force is the centripetal force, which is the frictional force.

This is not right, the body is tilted, it is just that the center of gravity becomes lower, and the force does not change.

So why does the more you tilt, the more strenuous it feels?

Because at this time, the contact point between the foot and the ground is used as the axis of rotation, and the human body is equivalent to a strenuous lever, and the more inclined the body, the larger the resistance arm.

For example, when you are not exercising, standing still on the ground, the more you lean your body, the more you exert yourself.

Haojie 2012 students said: It is the horizontal component of the supporting force that provides the centripetal force, and the static friction force is used to balance this component.

It couldn't be more wrong.

First of all, there is no horizontal component of the support force, and the support force is vertically upwards (the elastic force is perpendicular to the contact surface, at which point the sole is in contact with the ground, and the contact surface is horizontal).

Secondly, we assume that there is a horizontal component, and static friction is not used to balance this component.

The reason is that if it is balanced, there is no acceleration in the horizontal direction, and there is no acceleration in the vertical direction (people can't fly), and the acceleration is 0. When the resultant external force on the object is 0, it is at rest or moves in a straight line at a uniform speed.

So how else does he move in a uniform circular motion?

Hope it helps you o(o

A person running in a circular motion is different from a train turn:

Because the train track is high outside and low inside, the support force of the track to the car is perpendicular to the inner and outer track planes.

A person running in a circular motion is similar to a person riding a bicycle in a circular motion.

For the sake of understanding, it is analyzed in terms of the circular motion of a person riding a bicycle on a horizontal plane.

1. Because the ground support force for the car is perpendicular to the bearing surface, the support force is vertical;

2. Because people and bicycles are inclined inwards when turning, if the horizontal plane is smooth, the bicycle will slide outward, and the people and bicycles will fall to the ground inward;

Therefore, there is a static friction force that is horizontal to the inward;

3. The "supporting force" of the ground (to the vehicle).

It is the resultant force of the inward static friction and the vertical support force.

4. Running in a circular motion , providing centripetal force is:

The horizontal component of the "supporting force" (not the "supporting force"), or the resultant force of gravity and the "supporting force".

It is the horizontal component of the supporting force that provides the centripetal force, and the static friction force is used to balance this component.

For example, if a person turns to the left, the body will be slightly oblique to the left, the gravity is vertically downward, and the support force points to the center of gravity from the point of contact, that is, to the upper left

The human body needs to tilt to break down the horizontal force, and the reaction force is the centripetal force, which is the frictional force.

When the soles of the feet come into contact with the ground, the static friction that arises provides.

It is the first force that has a circular motion.

There are only two states of equilibrium of an object: stationary or uniform linear motion.

All other states of motion are produced by force.

An object moving in a circle moves in a circular motion because it is first subjected to a centripetal force, and this "centripetal force" is sometimes a single force, and sometimes it is the resultant force of several forces.

However, some students will think that there is a circular motion before there is a centripetal force, this is because we usually do questions, in which we will first tell us a physical situation and the motion state of the object, and we will analyze the force of the object through the motion state of the object. But in fact, this force is the "cause", the state of motion is the "effect", and there is a "cause" to have an "effect".

The force causes the object to produce acceleration, acceleration is a measure of the amount of change in velocity, and force is what makes the object move.

Specific to circular motion, circular motion requires a centripetal force acting on the object towards the center of the circle at every moment. If the centripetal force is too large, the object will do a near-centric motion and get closer and closer to the center of the circle; The centripetal force is not strong enough to restrain the object, and the object will move centrifugally and farther away from the center of the circle. Only when the centripetal force satisfies f=v r at any moment of circular motion, can the object continue to do circular motion at the next moment.

The conclusion is that there is a centripetal force before there is a :) circular motion

Welcome to ask, pure hand play, Wangha o( o

Newton's first law established that force has nothing to do with motion, and that force can only change the state of motion of an object. When an object is moving in a circle, if there is no force, the object will fly out in the tangential direction, force is a very complex concept, its action is not instantaneous, and there is no strict timing of force and motion.

Simultaneity. Regardless of variable speed or constant speed, as long as you do the garden circumferential movement, there will be a centripetal force. The centripetal force is not a qualitative force (gravity, friction, elasticity, etc. are qualitative forces), but an effect force, which is subject to centripetal force even if it is done in centrifugal motion, but the force provided is less than the centripetal force required for the movement.

1.No, the centripetal force f=mrw 2, is an equivalent force, not a real force. For example, the resultant force is also an equivalent force and is not a real force. There is also the sliding force, which is a component of gravity.

2.It should be said that the object needs centripetal force to do circular motion, for example, on a smooth tabletop, pull a small ball with a rope to do a uniform circular motion on the horizontal plane, at this time, centripetal force is required, and it is the tension force that provides the centripetal force. The condition for doing a uniform circular motion is that the net force to be subjected to the object is constant and the direction is always perpendicular to the direction of velocity - centripetal force.

3.Another example: using a rope to pull a small ball in a vertical plane to do a circular motion, at this time the centripetal force is required, it is the component of the tension force and gravity in the direction of the rope together to provide the centripetal force, change the direction of the speed.

The other component of gravity is in the direction perpendicular to the rope, i.e., in the straight line where the direction of velocity is located, changing the magnitude of the velocity. This is a variable speed circular motion.

This statement is true. As long as the object moves in a circular motion, it must be affected by the centripetal force, and it is this centripetal force that makes the object constantly change direction and move in a circular motion.

No, the centripetal force is not a new force, it is just an effect force, the force analysis does not consider that the centripetal force can be provided by the elastic force, it can be provided by the combined force of several forces, and it can only be said which forces provide the centripetal force, and it cannot be said that it is subjected to the centripetal force.

That's right. Because the condition of circular motion is that the net force to be subjected to the object does not change and the direction is always perpendicular to the direction of velocity - centripetal force.

Correct, whether you do radius or invariant is to be affected by the centripetal force, which makes its trajectory in the shape of an arc

The centripetal force reflects the effect of a force, which refers to the resultant force, and when the direction of the velocity and the direction of the resultant force are 90 degrees, the object will move in a circle. Centripetal force: Centripetal force is the force required to point to the center of curvature (the center of the circle when moving in a circle) to make the particle (or object) move in a curve.

The cause of centrifugal phenomenon is insufficient centripetal force. When an object moves in a circular motion, the external force pointing along the radius towards the center of the circle (or the component of the external force pointing towards the center of the circle along the radius) is called the centripetal force, also known as the normal force. It is a centripetal force that is provided or acted by an external force.

v is the linear velocity unit m s, is the angular velocity unit rad s, m is the mass of the object unit kg, r is the radius of motion of the object unit m, t is the period of circular motion unit s, f is the frequency of circular motion unit hz, n is the unit of circular motion speed (i.e. frequency) r s. Uniform circular motion (as well as curvilinear motion) is non-uniform motion. Uniform circular motion and non-uniform circular motion.

The magnitude of the centripetal force in a variable speed circular motion is not constant. The centripetal force interacts with the centrifugal force.