# Friction vs NonFriction problem

• SalahL
In summary, the path of motion of a block being pushed off a table by a spring will be different depending on the presence of friction. The block with friction will have a lower velocity and slower acceleration compared to the block without friction. However, after leaving the table, both blocks will have the same acceleration regardless of the presence of air resistance.
SalahL

## Homework Statement

A block is being pushed off the table by a spring. Explain the path of motion of the block if there is friction and if there is no friction.

N/A

## The Attempt at a Solution

The block with friction will have a lower velocity than its non friction counterpart because of the friction between the block and table... what else should I write?

Are you saying that the block moves at a constant speed and direction, just slower than without friction?
Notice that you were asked to explain the path of the motion - have you written about that?

Simon Bridge said:
Are you saying that the block moves at a constant speed and direction, just slower than without friction?
Yes, I'm looking for other differences between the two. Its the same scenario except one set has friction and the other does not.

OK - so how does the object move when it is shoved off a table without friction? How would you describe that?

Simon Bridge said:
OK - so how does the object move when it is shoved off a table without friction? How would you describe that?
It would accelerate quicker and have a higher velocity than its friction counterpart?

SalahL said:
It would accelerate quicker and have a higher velocity than its friction counterpart?
Initially, before leaving the table, yes but after leaving the table that both will have same acceleration.

Delta2
Buffu said:
Initially, before leaving the table, yes but after leaving the table that both will have same acceleration.
That depends if friction/resistance from the air is neglected. Do we know the only friction is from the table?

SalahL said:
It would accelerate quicker and have a higher velocity than its friction counterpart?
So the object accelerates with friction too? That also means the velocity is not constant right?
That is something you did not mention before... write it down.
The velocity when the object falls off the table will be slower in the friction case... what happens after the object leaves the table? Does "friction" include air resistance?

 Also - the question asks about the path that the object takes ... can you describe that when there is no friction?

Last edited:
Simon Bridge said:
That depends if friction/resistance from the air is neglected. Do we know the only friction is from the table?
Objects are same so the air resistance is same , and gravity is anyhow same.
The net force is same on both is objects after leaving the table.
Therefore even if air resistance is there, we can say the acceleration will be same.

That was my reasoning.

Buffu said:
Objects are same so the air resistance is same , and gravity is anyhow same.
The net force is same on both is objects after leaving the table.
Therefore even if air resistance is there, we can say the acceleration will be same.

That was my reasoning.
The question asks to compare the path the objects take with and without friction ... if air resistance is to be cosidered as "friction" in this context, then the air resistance for the first case is zero.

Simon Bridge said:
The question asks to compare the path the objects take with and without friction ... if air resistance is to be cosidered as "friction" in this context, then the air resistance for the first case is zero.
Anyhow, acceleration after leaving the table will be same for the both.

Buffu said:
Anyhow, acceleration after leaving the table will be same for the both.
That's not necessarily true if you're considering velocity-dependent drag forces, but in this problem, the OP was probably supposed to neglect air resistance.

Buffu

## What is the difference between friction and non-friction problems?

Friction problems involve the analysis of forces that act against motion, while non-friction problems do not involve any forces that resist motion.

## What are some examples of friction and non-friction problems?

Examples of friction problems include sliding a box across the floor or pushing a car up a hill. Non-friction problems could include an object falling freely under the influence of gravity.

## How does friction affect the motion of an object?

Friction can cause an object to slow down or stop due to the force it exerts in the opposite direction of motion. It can also cause heat to be generated between two surfaces in contact.

## What factors can affect the amount of friction in a problem?

The amount of friction can be affected by the type of surfaces in contact, the force of the objects pressing against each other, and the presence or absence of lubricants or other substances between the surfaces.

## How is friction important in real-life scenarios?

Friction plays a crucial role in our daily lives, from allowing us to walk without slipping to keeping our car tires on the road. It also helps to slow down or stop moving objects, making it essential for safety in many situations.

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