Moving a 250kg Elephant with 425N Force

  • Thread starter Thread starter physicshard22
  • Start date Start date
  • Tags Tags
    Force
AI Thread Summary
A boy exerts a horizontal force of 425N to slide a 250kg elephant across carpeting. The net force acting on the elephant is calculated using the equation Fnet = Fap - Ff, where Ff represents the frictional force. The normal force (Fn) is equal to the gravitational force (Fg), leading to Fn = 250kg x 9.81m/s². The coefficient of kinetic friction (μk) is determined to be approximately 0.173 by dividing the applied force by the normal force. The discussion raises questions about the frictional force and its relation to the applied force.
physicshard22
Messages
21
Reaction score
0

Homework Statement


A boy puts a 250kg elephant on a piece of carpeting and slides it across the floor by exerting a horizontal force of 425N on the elephant



Homework Equations


Ff = uKFn


The Attempt at a Solution


Fn = Fg
Fnet = Fap - Ff
Fnet = 425 - Ff
ma = 425 - uKFn
250a = 425 - uK(2450)
 
Physics news on Phys.org
what is the question asking?
 
for coefficient of kinetic friction
 
mue=f max/fn
425N/(250x9.81)
mue=.173

I believe that's how you do it
 
why is friction 425N
 
its force
 
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Thread 'Variable mass system : water sprayed into a moving container'
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
Back
Top