Newton's Third Law-two masses on a wedge

  • Thread starter Thread starter jiwon
  • Start date Start date
  • Tags Tags
    Wedge
Click For Summary
SUMMARY

The discussion focuses on applying Newton's Third Law to a system involving two masses on a wedge. The equations derived include T - m2g = -m2a and T - m1g sin(theta) - u m1g cos(theta) = m1a, leading to the acceleration formula a = g(m2 - m1sin(theta) - m2cos(theta)) / (m1 + m2). Substituting the values of m1 = 10 kg, m2 = 8 kg, theta = 30 degrees, and u = 0.2 results in an acceleration of a = 0.69 m/s². The final velocity is calculated using vf² = v0² + 2ad, confirming the solution's validity.

PREREQUISITES
  • Understanding of Newton's Laws of Motion
  • Basic knowledge of trigonometry (sine and cosine functions)
  • Familiarity with kinematic equations
  • Ability to perform algebraic manipulations
NEXT STEPS
  • Study advanced applications of Newton's Laws in multi-body systems
  • Learn about friction coefficients and their impact on motion
  • Explore the use of vector components in physics problems
  • Investigate real-world applications of kinematic equations in engineering
USEFUL FOR

Physics students, educators, and anyone interested in mechanics, particularly those studying dynamics and kinematics involving multiple masses and forces.

jiwon
Messages
4
Reaction score
0

The Attempt at a Solution



8 kg block:

T-m2g = -m2a

T-m1g sin(theta)- u m1g cos (theta) = m1a
T -m2g=-m2a

subtract equations:

-m1gsin(theta)-umigcos(theta) + m2g =
(m1+m2)a

or a = g(m2-m1sin(theta)-m2cos(theta)/(m1+m2)

substituting values:

a=g(8-10sin(30)-0.2(10)cos30)/(18)

a=0.69m/s/s

b)

vf^2=v0^2+2ad to find final velocity, knowing v0=0, a=0.69m/s/s and d=0.4m
 
Last edited:
Physics news on Phys.org
Your 1st part looks good so therefore i think the second part should be alright since its just subsituting values inside. So what's your question haha:biggrin:
 

Similar threads

  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 35 ·
2
Replies
35
Views
4K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 2 ·
Replies
2
Views
8K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 3 ·
Replies
3
Views
3K
Replies
8
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 4 ·
Replies
4
Views
3K