Understanding Force and Mass in Kangaroo Jumps

  • Thread starter Thread starter danield
  • Start date Start date
  • Tags Tags
    Force
AI Thread Summary
The discussion revolves around solving a physics problem involving a kangaroo's jump and the effect of carrying a baby kangaroo on its height. A 40-kg kangaroo can jump 2.0 m without a baby but only 1.8 m with one, prompting the question of the baby kangaroo's mass. Participants discuss the difficulty in applying free body diagrams and the relevant forces at play. The original poster expresses confusion over the calculations and the physics concepts involved, particularly in determining the relationship between force, mass, and height. The conversation highlights the importance of understanding the forces acting on the kangaroo during its jump to solve the problem effectively.
danield
Messages
35
Reaction score
0
Hey.. i am having problems solving the following question...

2) A 40-kg kangaroo exerts a constant force on the ground in the firs 60 cm of her jump, and rises 2.0 m higher. When she carries a baby kangaroo in her pouch, she cna rise only 1.8 m higher, What is the mass of the baby kangaroo?

I am not interested in the answer so much.. but in the logic of the problems.. i just can't do a free body diagram for them..
please help
,dan
 
Last edited:
Physics news on Phys.org
Well, for (1), which forces are acting on the crate? Further on, what does the constant velocity tell you about the forces acting on the body?
 
ok 1.. i could solve.. i used the equation of force applied+weight=force of friction, and i found force applied and the direction.
But I am still having trouble wiht 2)
 
Well I've been trying to do something like 2y/g=t^2, then V=y/t and then A=v/t, but i guess that is not working, i think I've been seeing it from the wrong angle, but any way i try i can't get the answer :(
 

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

Calculating the Force of a Kangaroo's Legs
Replies
21
Views
2K
Calculating Kangaroo Jump Distance: How High Can They Go?
Replies
14
Views
3K
The curious question of the leaping kangaroo
Replies
1
Views
4K
Calculate the gravitational force exerted on a 5.00 kg baby
Replies
2
Views
2K
Distribution of Energy when work is done on a system of 2 masses connected by a spring
Replies
17
Views
1K
Understanding Tension Forces in a Slowly Rising System
Replies
1
Views
1K
Mass needed to balance the magnetic force on upper rod
Replies
2
Views
3K
How to solve for the moment of inertia and angular acceleration?
Replies
21
Views
3K
Dynamics/Kinematics - Jumper beats record jump
Replies
2
Views
2K
How High Can a Dog Jump by Exerting Maximum Force?
Replies
7
Views
3K

Hot Threads

Recent Insights

Back
Top