You can t move without friction, and you can t move without friction

can move, and the force is the reason for changing the state of motion, not the reason for maintaining the state of motion. There are probably two situations:

1. Since you don't have any friction with the ground or even the outside world, you can still move with the help of external forces. Just look at a rocket flying in space. For example, if you blow a breath, you can move in the opposite direction of the blow.

If the blow is not strong enough, then a fart is absolutely very powerful, very powerful!

Second, the brother upstairs said that if you are squeezed by the outside world, you will also "fly".

Can have muzzle velocity.

Force is what changes the state of motion, not what sustains it.

Objects can still move without friction.

However, if even the friction is gone, it means that the relative motion between matter and matter has no effect, and even if you kick it, you can only lose your balance and fall to ......the ground (in fact, floating in the air), and you will never be able to get up again

Yes, but there must be an initial velocity.

If it is already moving, the object continues to move at its original velocity.

If an object is stationary, it will not move.

1.There are so many forces that can make an object move, and friction is just one of them. For example, if you kick on the ground, don't you just move?

2.Same as on the second floor.

Right, unless someone pushes you.

Agree to the 3rd floor, it's okay, you can move if you fart a lot.

What would the Earth be like if there was no friction -- If there was no friction, we wouldn't be able to walk. Because he could neither stand nor walk. For example, when walking on the ice, because of the ice slippery, I was tired and sweating after walking a short distance.

If there was no friction, the road would be smoother than ice, and people would only feel better if they fell to the ground. If there is no friction, the screws cannot be tightened, and the nails nailed to the wall will automatically loosen and fall. The tables and chairs at home will be spread out, and they will slide over the floor with missing wheels, and they will slide over, and they will not be usable at all.

When pushing the table, when there is no thrust, if there is no friction, then the object has to move to the right, so the object has a tendency to move to the right, so the object will be subjected to a leftward static friction force that hinders this tendency of it.

For another example, in the process of transporting the goods upwards with the conveyor belt, if there is no friction, the goods should slide down the inclined plane, so the object has the tendency to slide along the inclined plane, so the conveyor belt has the effect of static friction along the upward slope of the goods, so as to hinder the movement trend of the goods sliding downward.

If there is no friction and medium resistance, the total amount of mechanical energy remains untouched when the object only undergoes the mutual conversion of kinetic energy and potential energy.

That's the effect of no friction.

The analysis is as follows: it can only be said that it is possible, but not necessarily.

For example, if the ground is smooth and frictionless, the car will not start under normal circumstances. Because the traction force that we talk about is actually the static friction force exerted by the ground on the driving wheels. But if there is other power, it is possible to activate the clear.

For example, when the ground is smooth and frictionless, the car cannot be stopped under normal circumstances. Because the braking force that we usually fake is actually the backward sliding friction force exerted by the ground on the four wheels of the car. But if there is other resistance, it is possible for the car to stop.

In order for a person to take a step forward, he must accelerate from his stillness forward, and he must be subjected to an external force forward.

Where does this force come from, when one foot is stepping forward, the other foot kicks backwards, there is a tendency to move backwards relative to the ground, and the friction force hinders the tendency of the foot to move backwards, so forward, this is the force that accelerates people forward.

Without friction, man cannot move forward.

Of course you can't go! The final force of the human step still acts on the foot that does not lift the foot! Then act on the ground, if the ground is smooth, there is no friction between the foot and the ground! Then the ground cannot provide a force to man! Naturally, people cannot move.

If you walk on ice in winter, will you fall on the spot?

You can't walk, you can't run or jump, you can't do any contact sports, you can't pick up a cup.

Friction is not necessarily hindering the movement of an object.

For example, when a person walks, the ground pushes the ground to give backward force, because the force between objects is reciprocal, and the ground gives the foot forward friction force, so that the person can walk forward. So at this point, friction is what makes the object move.

Another example is conveyor belts transporting objects. The force that moves the object forward is also the frictional force of the conveyor belt to the object.

Friction can be a force (which moves an object in motion) or a drag force (which hinders the movement of an object).

When the direction of friction is the same as the direction of movement of the object, the motion of the object is promoted, such as the friction between the driving wheels and the ground when the vehicle is advancing.

When the direction of friction is opposite to the direction of movement of the object, it hinders the movement of the object, such as the friction between the brake wheel and the ground when the vehicle brakes.

Not necessarily, as the car moves forward.

People rely on friction to move forward while walking.

Show you a question and you will understand the true/false question (say why it is wrong or why it is right) 1The direction of friction must be opposite to the object 2The friction must be the resistance 3

Friction always hinders the movement of an object 4Frictional force always hinders the relative motion 5An object sliding on the surface of another object must be subjected to friction 6

The frictional force of the object is directly related to the gravity of the black coat The fourth positive collapse is true, and the rest are all wrong. Definition of friction: When relative motion between two objects is about to occur or has occurred, a force will be generated between the contact surfaces that hinders the relative motion of the objects, and this force is the frictional force group.

From the definition of friction, it has been clearly stated that friction is the obstruction of the relative motion of an object, and its direction is opposite to the direction of the relative motion of the object. Example: When a person is climbing a pole (tree), the hand grips the pole firmly, and the hand exerts a pressure perpendicular to the pole.

Then, the hand pulls down forcefully, at this point, the hand creates a downward force against the rod. Note: Assuming there is no friction, the hand will definitely move downward.

But the actual situation is that because the hand has a tendency to move downward, a force will be generated between the contact surfaces that hinders the downward movement of the hand, and the direction is upward, this force is friction, and it is static friction. Another example is when a person is walking, and the person pushes the ground backwards hard, which will produce a forward friction force that makes the person move forward. Assuming there is no friction, would the foot move backwards?

Knowing the above example, then why is it wrong, you should understand, right? 5 is wrong. Since the landlord already knows that one of the conditions for friction is pressure, does the two objects in contact necessarily have pressure?

Definitely not. So there is not necessarily friction. 6 is wrong.

Friction is determined by the pressure and the roughness of the contact surface, not by the magnitude of gravity, so there is no direct relationship.

Friction is not in motion, but in the tendency to move.

That is, when an object is squeezed with other objects and has a tendency to move, friction is generated between objects. It is the force that prevents the relative motion of objects from taking place, not the force that occurs when objects move relative to each other.

To use an analogy: when you push a heavy podium, you can't push it. You must give the podium a force that moves relative to the ground, and it does not move, that is, it is in a state of equilibrium, then there must be a force that cancels out your thrust, and this is the frictional force.

You microcosm the above statement, that is, the podium becomes one molecule, the ground becomes another molecule, they move relatively, and then imagine it, you should be able to understand.

If you don't understand it yet, hi me.

Frictional forces are generated when objects are in relative motion or have a tendency to move relatively, the former is dynamic friction and the latter is static friction. The static friction force always increases with the increase of the external force and balances with the external force before it reaches the maximum value, so the object does not change its original state of motion.

When the friction force above is not greater than the static friction force below, the object below will not move.

The resultant force problem, the net force is not 0 and there is a certain motion, and the net force is 0 may be uniform or stationary!