Calculating Forces & Friction on a Block Resting on an Incline

  • Thread starter Thread starter aoo
  • Start date Start date
  • Tags Tags
    Forces Friction
AI Thread Summary
To determine the horizontal force required to push a 5 kg block on a 30-degree incline with a static friction coefficient of 0.2, the equation ma = Fapp - (m)mg - mgsin30 is used. The discussion emphasizes the need to clarify whether the force is for moving the block up or down the incline and the direction of friction. Participants suggest avoiding immediate substitution of numbers to focus on the conceptual understanding of forces involved. The conversation also touches on the implications of the block's acceleration in both scenarios. Understanding these dynamics is crucial for calculating the necessary force to initiate movement.
aoo
Messages
1
Reaction score
0
A 5 kg block rests on a 30degree incline
the coefficient of static friction is between the block and incline is 0.2
how large a horizontal force must push on the block if the block is to be on the verge of sliding a)up the incline and b) down the incline

So far I have ma=Fapp-(m)mg-mgsin30
where (m) is miu or friction co-efficient

ive been working on this for a long time but not sure how to get the answers
any help will be much appreciated!
 
Physics news on Phys.org
Welcome to PF;
Would you be able to do this if the block were not on an incline?

So far you have ##ma=F_{app}-\mu_kmg - mg\sin{\theta}## (resist the urge to put the numbers in so soon).

Is this for pushing the block up or down the slope?
Which direction does friction act?

According to the description: what is the acceleration?
 

Thread 'Is calling fictitious forces "not real" just about terminology?'

Hi there, im studying nanoscience at the university in Basel. Today I looked at the topic of intertial and non-inertial reference frames and the existence of fictitious forces. I understand that you call forces real in physics if they appear in interplay. Meaning that a force is real when there is the "actio" partner to the "reactio" partner. If this condition is not satisfied the force is not real. I also understand that if you specifically look at non-inertial reference frames you can...
View full post »

Thread 'Inclined treadmills and Galilean Invariance'

This has been discussed many times on PF, and will likely come up again, so the video might come handy. Previous threads: https://www.physicsforums.com/threads/is-a-treadmill-incline-just-a-marketing-gimmick.937725/ https://www.physicsforums.com/threads/work-done-running-on-an-inclined-treadmill.927825/ https://www.physicsforums.com/threads/how-do-we-calculate-the-energy-we-used-to-do-something.1052162/
View full post »

Thread 'Derivation of Hamilton's Principle: Questions'

I have recently been really interested in the derivation of Hamiltons Principle. On my research I found that with the term ##m \cdot \frac{d}{dt} (\frac{dr}{dt} \cdot \delta r) = 0## (1) one may derivate ##\delta \int (T - V) dt = 0## (2). The derivation itself I understood quiet good, but what I don't understand is where the equation (1) came from, because in my research it was just given and not derived from anywhere. Does anybody know where (1) comes from or why from it the...
View full post »

Similar threads

B Rotational Dynamics: Confused about the tension in this string pulling a mass up an incline
Replies
2
Views
1K
I If frictional force in system is <= us*N then there is no slipping
Replies
7
Views
2K
B Normal Force Discrepancy for Wedge Vs. Ramp
Replies
9
Views
3K
I Determine if the block will slide or flip over after contact
Replies
8
Views
2K
How Does Friction Affect Momentum on an Inclined Plane?
Replies
1
Views
1K
What determines the direction of static friction forces?
Replies
6
Views
2K
Static friction confusion -- Friction versus the Normal force
Replies
7
Views
2K
Is mgsinθ=static frictional force on an inclined plane?
Replies
3
Views
4K
Does coefficient of static friction change with angle
Replies
4
Views
13K
How does the reaction force of friction affect the ground?
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top