Friction Forces, find the coefficient of kinetic friction

AI Thread Summary
To find the coefficient of kinetic friction (μ_k) for a crate being pushed at a constant velocity, start by applying Newton's Second Law in both the x and y directions. The crate has a mass of 50 kg and is pushed with a force of 200N at a 20-degree angle upwards. A free body diagram (FBD) will help visualize the forces acting on the crate, including the normal force and frictional force. The frictional force can be determined from the applied force and the angle, allowing for the calculation of μ_k. Understanding how to resolve the forces and apply the equations will lead to the solution.
bellanella23
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Hello,

I am stuck on this question, I don't understand what to do. Any help would be great! I know that I have to use Newton's Second Law in the x and y directions.

Greezy is pushing a very large crate of 50 kg across the floor at a constant velocity with a force of 200N. He is pushing on the crate upwards at an angle of 20 degrees.

What is the coefficient of kinetic friction between the ground and the create?

I don't understand what to do with that angle that is upwards?

Thanks again!
 
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bellanella23 said:
Hello,

I am stuck on this question, I don't understand what to do. Any help would be great! I know that I have to use Newton's Second Law in the x and y directions.

Greezy is pushing a very large crate of 50 kg across the floor at a constant velocity with a force of 200N. He is pushing on the crate upwards at an angle of 20 degrees.

What is the coefficient of kinetic friction between the ground and the create?

I don't understand what to do with that angle that is upwards?

Thanks again!

On problems like this, you should usually start by drawing a free body diagram (FBD), showing the forces on the object. Then what do you do with the sum of the forces in each dimension (hint: F=ma)...?
 
Thank you.
 
You're solving for mu_k.

In order to do that you should know what Friction Force is equal to. Plug that in and solve!
 
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}...
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