How Much Force to Apply on m1 to Make m2 Jump Off the Table?

  • Thread starter Thread starter thoff430
  • Start date Start date
  • Tags Tags
    Coupled Spring
AI Thread Summary
To make m2 jump off the table, the force applied on m1 must exceed the gravitational force acting on m2. The key equations involve Newton's second law and Hooke's law, indicating that the force F must be greater than the weight of m2 (F > m2 * g) at the moment of release. The confusion arises from the fact that m1 is already exerting a force on m2 due to its weight. Thus, the total force applied must account for both m1 and m2 to ensure m2 experiences a net upward force sufficient to overcome gravity. Understanding the net force at the instant of m2's jump is crucial for solving the problem.
thoff430
Messages
4
Reaction score
0

Homework Statement



Hey there,

We assume that the spring got no mass and there are no frictions. If you want to push down just as hard on m1 that if you release ... m2 will be just about to jump and leave the table?


unbenannt_979.jpg


Homework Equations



Newton and Hooke are our very best friends :)

The Attempt at a Solution



1. F > (m1 + m2) * g

or

2. F > m2 * g ?

Im a bit confused, as m1 is already pushing on the string even if there is no extra force... but how much do I have to push down for myself on m1? My guess is that 1 would be to total amount of force "pulling" on m2, but the force needed to get this right, would be 2, as m1 is supporting.

Thanks in advance
 
Physics news on Phys.org
What is the condition that m2 jumps and leaves the table? What can you say about the net force acting on it at that instant?

ehild
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Two blocks of mass m1, m2 are attached to a spring
Replies
16
Views
4K
Escape velocity of an iron asteroid
Replies
5
Views
2K
How Does a Force Affect Spring Length Between Two Equal Mass Blocks?
Replies
2
Views
2K
Friction/spring/inclined plane problem
Replies
7
Views
2K
You're welcome, Rémi! Good luck with your exercise.
Replies
2
Views
2K
Basic Forces and Motion Problem (friction)
Replies
2
Views
1K
Force exerted by M1 on M2 problem
Replies
3
Views
6K
How to find max velocity in a spring-mass system?
Replies
5
Views
7K
Two blocks, a fixed pulley and friction
Replies
4
Views
3K
Calculating speed in circular motion
Replies
1
Views
1K

Hot Threads

Recent Insights

Back
Top