Tricky Problem (at least for me)

  • Thread starter Thread starter need help
  • Start date Start date
AI Thread Summary
To find the final velocity with an initial velocity of 0 m/s, an acceleration of 0.76 m/s², and a distance of 2 meters, the equation v_f² = v_i² + 2a(x_f - x_i) can be used, resulting in a final velocity of approximately 2.47 m/s. For calculating the net force (F_net), the force of friction is determined by multiplying the normal force (-49 N) by the coefficient of friction (0.15), yielding -7.35 N. F_net can then be calculated by summing the forces acting on the object, including gravity and friction. The total force acting on the object, considering its mass and acceleration, is essential for determining F_net. Understanding these relationships is crucial for solving the problem accurately.
need help
Messages
1
Reaction score
0
If I have a initial velocity of 0m/s and an acceleration of .76m/s2 and a distance of 2meters what would my final velocity be?


Also I need to find F(net) I know a mu of .15 a time of 5seconds a mass of 5kg and force of gravity equals 49N an normal force equals -49N and force of friction equals -7.35N. I think I'm supposed to use the velocity found in the question above, but I'm not sure and I don't know how. How do I find F(net) with the information I have and what is the answer??

Any help would be greatly appriciated...
 
Physics news on Phys.org
need help said:
If I have a initial velocity of 0m/s and an acceleration of .76m/s2 and a distance of 2meters what would my final velocity be?
v_{f,x}^2 = v_{i,x}^2 + 2 a_x (x_f-x_i) where x_f-x_i is essentially the distance traveled. have you seen this equation before?
Also I need to find F(net) I know a mu of .15 a time of 5seconds a mass of 5kg and force of gravity equals 49N an normal force equals -49N and force of friction equals -7.35N. I think I'm supposed to use the velocity found in the question above, but I'm not sure and I don't know how. How do I find F(net) with the information I have and what is the answer??

Any help would be greatly appriciated...
It

The key point is that the magnitude of the friction force is equal to the magnitude of the normal force times the coefficient of kinetic friction \mu_k
 
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 »

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 »

Similar threads

Total work done while pushing a wheelchair
Replies
4
Views
2K
Complex Kinematics and Dynamics
Replies
8
Views
2K
Complex Kinematics and Dynamics
Replies
7
Views
2K
Coefficient of Friction when Normal Force is Reduced [HS]
Replies
5
Views
2K
How to calculate the wind force acting on a water drop?
Replies
39
Views
3K
Block drifts off between two moving planes through friction
Replies
21
Views
803
Relation between Friction, Velocity, and Acceleration
Replies
16
Views
983
Why Does the Friction Force Not Match in the Two Block Problem?
Replies
15
Views
3K
Motion on a rough inclined plane
Replies
5
Views
2K
Newton's law problem: Pushing 2 stacked blocks on a horizontal table
Replies
13
Views
3K

Hot Threads

Recent Insights

Back
Top