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My teacher said there isn't a special kind of formula, you just derive it from f=ma.
This is the diagram:
This is the diagram:
Doc Al said:I assume you want the contact force between those two masses. Your teacher is right. Just apply Newton's 2nd law.
Hint: First find the acceleration of the system.
Good. Now apply Newton's 2nd law to M1 alone.Taz. said:Yes. I found the acceleration.
Right.Taz. said:To find the the answer in N ?
So-> F= m1 * acceleration that I found for the whole system ?
That's Newton's 3rd law. Whenever two objects interact, they exert equal and opposite forces on each other.Ok, I found the answer. But scientifically, I don't understand how.
My teacher said that the contact force for both blocks is the same. How is that possible ?
Definitely.So if a bee flying at 10 km/h hits a car moving at 30 km/h the forces between both bodies is the same.
If you're applying Newton's 2nd law to m1, why in the world would you use m2?Taz. said:Ok but why did we use m1 rather then m2 when we applied Newtons second law on m1 ?
When applying Newton's 2nd law to m1, use the mass of m1.Taz. said:Why would you use the mass of m1 and not m2 ?
Right.Taz. said:My acceleration is: 1.32 m/s^2
That's correct.And then I just multiplied 1.32 m/s^2 by 1.39 m/s^2.
The contact force is not the only force acting on m2. To apply Newton's 2nd law to m2, you must use the net force: ƩF = m2*a.If I do 1.32 m/s^2 *3.46 m/s^2 I don't get the same answer...
Sure. First identify the forces acting on each block. What forces act on m2? On m1?Taz. said:Can you help me to draw a FBD for this problem ?
Doc Al said:Sure. First identify the forces acting on each block. What forces act on m2? On m1?
What do you mean by 'force going forward'? The only thing in contact with m1 is m2.Taz. said:m1-> force coming from m2 and force going forward.
Right. They act in different directions, of course.m2->force from F (6.40N) and force of contact.
Only one force acts on m1. In what direction does it act?Taz. said:<-m1
<-m2->
or
<-m1->
<-m2->
I don't quite understand what you are doing here. You want:Taz. said:but just a last question-> for m2 is it 6.20 + F = 2.82 *1.18 OR -6.20 + F = 2.82 *1.18
The applied force F acting to the right; the contact force from m1 acting to the left.Taz. said:How would the FBD look like for m2 ?
That doesn't specify which arrow goes with which force. I'd draw it like this:Taz. said:But where are the arrow pointing ?
<-m2->
Like this ?
<---(Fc)---[m2]---(F)--->
Contact force is a type of force that occurs when two objects physically touch each other. This is different from other types of forces, such as gravitational or electromagnetic forces, which can act at a distance without physical contact.
The magnitude of contact force is determined by the amount of force applied, the surface area of contact between the objects, and the materials and textures of the surfaces in contact.
The direction of contact force is always perpendicular to the surface of contact between the two objects. This means that the force is pushing or pulling along the surface, rather than at an angle.
Yes, contact force can be both attractive and repulsive. An example of attractive contact force is when a magnet sticks to a metal surface. An example of repulsive contact force is when two magnets with the same polarity push each other away.
Contact force can be measured using a force sensor or a force meter. These tools can measure the amount of force exerted when two objects touch each other. Another way to measure contact force is by using equations that take into account the factors mentioned in question 2.