Recent content by Mohamad

Thanks a lot, I understood the faults and oversimplifications in my question.

In both situations that I said, materials are identical, so it doesn't matter. I don't want an actual number for amount of force. I only want a comparison between forces in these two situations. Suppose we don't know anything about the after of collison. Can we do a comparison between the...

I don't know how to compute the force between objects, given mass and velocity.

I asked the difference between force of object1 and force of object2 on the block? They are two different situations. I can't understand the relationship with Newton's third law!

Suppose object1 with mass m and velocity v has collided with a block. Also, object2 that has identical shape and dimensions with mass m/2 and velocity 2v has collided to that block. Since the momenta of two objects are identical but the kinetic energy of object2 is twice: Are the forces between...

If the initial kinetic energy is equal to the final kinetic energy where two objects that collide stick together, this collision is elastic or inelastic?

Has the friction force the same direction as the car moving or is in the opposite?

Are there any differences between a ball and the tire of a car, whereas the tires of car get their force from the engine?

No, I only asked my question in two ways. Is there any friction force? and if no, so the car continues its straight route with no problem on an icy land.

Suppose we are driving on moon (I mean there is not air resistance) at a constant velocity. Suddenly the car goes on an icy land (the friction is zero). What happens? In other words, if we drive at constant velocity and there isn't air resistance, Is there any friction force between tires and...

We say the unit of gravitational costant is m3/kg.s2, but what does it mean? I mean, I think we define units when we need to measure a quantity and thereby compare it with other same kind of quantities. So what does it mean to define a unit for a constant, when it doesn't change?

Can I conclude that in this video, if the curve be circle, the car can't increase its speed in the curve? And if this is true what happens if the driver press the gas pedal more?

OK, so if extra force propelled out the ball, how we can increase the speed of an object when we are swinging an object round in a circle using a string?

A.T. F=mrω2, m is consntant, r could not increase, so I think ω should increase. Do I hava a misconception? P.S. a is perpendicular to v so I used that formula.

I thought when path is a circle, a is perpendicular to v. Is this wrong?