What is the acceleration of a crate after it has just started to move?

  • Thread starter Thread starter quanitary
  • Start date Start date
  • Tags Tags
    Acceleration
AI Thread Summary
The discussion focuses on calculating the acceleration of a crate after it begins to move, given the coefficients of static and kinetic friction. The static friction force is determined using the static friction coefficient and the normal force, while the kinetic friction force is calculated with the kinetic friction coefficient. The net force acting on the crate once it starts moving is the difference between the static force and the kinetic friction force. The incorrect initial acceleration calculation of 4.39 m/s² indicates a misunderstanding in applying the forces. Properly accounting for these forces will yield the correct acceleration of the crate.
quanitary
Messages
5
Reaction score
0

Homework Statement



The coefficients of static and kinetic friction between a 445 N crate and the warehouse floor are 0.565 and 0.450, respectively. A worker gradually increases his horizontal push against this crate until it just begins to move and from then on maintains that same maximum push.


Homework Equations


What is the acceleration of a crate after it has just started to move?


The Attempt at a Solution



I tried to multiply the kinectic friction coefficient by the Normal Force to get kinetic friction. Then I tried to divide Kinectic Friction by the mass of the box and I got:

4.39 m/s2 but it was wrong.
 
Physics news on Phys.org
quanitary said:

Homework Statement



The coefficients of static and kinetic friction between a 445 N crate and the warehouse floor are 0.565 and 0.450, respectively. A worker gradually increases his horizontal push against this crate until it just begins to move and from then on maintains that same maximum push.


Homework Equations


What is the acceleration of a crate after it has just started to move?


The Attempt at a Solution



I tried to multiply the kinectic friction coefficient by the Normal Force to get kinetic friction. Then I tried to divide Kinectic Friction by the mass of the box and I got:

4.39 m/s2 but it was wrong.

The force needed to start moving the box is F_static= mu_static * Normal
Once the box starts moving the force of kinetic friction is F_kinetic=mu_kinetic *normal

The net force at that point is F_net=F_static-F-kinetic
a = F_net/mass_crate
 
korican04 said:
The force needed to start moving the box is F_static= mu_static * Normal
Once the box starts moving the force of kinetic friction is F_kinetic=mu_kinetic *normal

The net force at that point is F_net=F_static-F-kinetic
a = F_net/mass_crate

Thanks!
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

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...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

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}...
View full post »

Similar threads

Crate pushed up an inclined plane
Replies
6
Views
6K
Maximum Acceleration of sliding crates
Replies
6
Views
2K
What is the acceleration of the upper crate when the top crate begins to slide?
Replies
10
Views
4K
What equation do i use to find the acceleration?
Replies
3
Views
3K
How Can the Acceleration of a Crate on a Truck Be Determined?
Replies
11
Views
2K
Friction Problem of a Crate Sliding Down a Ramp
Replies
4
Views
3K
What is the acceleration of the crate?
Replies
12
Views
6K
Static Friction and Frictional Force Ranking Task of Crate
Replies
5
Views
23K
What is the Change in Kinetic Energy of a Crate Being Pulled at an Angle?
Replies
1
Views
2K
Acceleration with two wooden crates
Replies
4
Views
15K

Hot Threads

Recent Insights

Back
Top