Net force acting on a piston shaft of an actuator

AI Thread Summary
To calculate the speed at which a piston shaft will eject from an actuator, the net force acting on it must be determined. The net force is calculated by subtracting the weight of the piston and the frictional force from the upward force exerted by compressed air. The coefficient of friction is noted, but without knowing the normal force, it complicates the calculation of the frictional force. The length of the actuator is specified as 10 inches, but additional information is needed to proceed accurately. Direct measurement of the frictional force is suggested as a practical approach to resolve uncertainties.
rajdeep1
Messages
3
Reaction score
0

Homework Statement


A cylindrical piston shaft weighs 250 g and is held vertically inside an actuator (We can assume actuator is a box with hollow cylindrical space to fit the piston shaft). Compressed air at 100 psi is supplied at the bottom of the actuator and is acting on the piston upwards with a force of 90 N. The coefficient of friction between the piston shaft and the inside wall of the actuator is 0.61. I need to calculate the speed by which the shaft will eject and shoot upwards from the actuator.

Homework Equations


Net Force= ma
d= ui*t+ 0.5*a*t^2

The Attempt at a Solution


Net Force= 90N- 0.25*9.81 - Ff (I am not sure if this is the right way to calculate the net force. Also, not sure how to calculate the frictional force here, although I do know Ff= coeff* R)

Assuming I have a net force, I can easily find the acceleration and the distance it travels in a second.

Thank you so much.
 
Physics news on Phys.org
Is this a textbook question or a lab? There is not enough information. You will certainly need to know the length of the actuator.
The coefficient of friction doesn't help with no way to determine the normal force.
 
It is not a textbook question, it is more of a lab question. The length of the actuator is 10 inch.
Is there any other information that we need?
Thank you.
 
rajdeep1 said:
It is not a textbook question, it is more of a lab question. The length of the actuator is 10 inch.
Is there any other information that we need?
Thank you.
As I wrote, the coefficient of friction is no help since there is no obvious way to find the normal force between piston and cylinder. It would be more helpful simply to measure the frictional force.
 
haruspex said:
As I wrote, the coefficient of friction is no help since there is no obvious way to find the normal force between piston and cylinder. It would be more helpful simply to measure the frictional force.
Thank you. Could you please tell me the ways to measure the frictional force then?
 
rajdeep1 said:
Thank you. Could you please tell me the ways to measure the frictional force then?
By direct experiment.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanged mass'

Thread 'A cylinder connected to a hanged 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

Atmospheric Pressure on Shaft of piston cylinder assembly
Replies
3
Views
5K
Block on a Spring, Nonconstant Net Force
Replies
6
Views
1K
Engineering Loads on a shaft with V-Belts
Replies
2
Views
2K
Ideal gas in a cylinder with a piston
Replies
5
Views
11K
Stationary vertical cylinder with heavy piston
Replies
3
Views
3K
Net Force acting on block on incline
Replies
1
Views
2K
Net force acting on a charged particle ##+Q##
Replies
9
Views
2K
Brake mechanism in a car and pressurised oil
Replies
4
Views
2K
Automotive How to calculate hydraulic disc brake size using actuation force?
Replies
15
Views
6K
Finding net force from acceleration, speed and distance
Replies
13
Views
2K

Hot Threads

Recent Insights

Back
Top