• Support PF! Buy your school textbooks, materials and every day products via PF Here!

Applying Newton's Laws Projected Up an Incline

  • Thread starter djester555
  • Start date
Projected Up an Incline A block is projected up a frictionless inclined plane with initial speed v1 = 3.43 m/s. The angle of incline is θ = 32.5°.
(a) How far up the plane does it go?

(b) How long does it take to get there?

(c) What is its speed when it gets back to the bottom?



What i got soo far
v * T = d

a) 3.43 * .674 = 2.31 m


b)vi = 3.43
vf = 0
a = - 9.80 sin32.5
t = ?

t = (vf - vi) / a
t = 3.43 / (9.80 sin32.5)
t = 0.674




c) dont even know where to begin on this one
 
You can solve the problem using the equations of motion

vf2 = vi2 +2ad ---------(1)
vf = vi + at --------(2)
where vf and vi are the final and initial velocity respectively and a is the acceleration, t is the time

Using equation (1), you can solve for d
and using (2) you can solve for t

For the third question, you have to consider the distance the block has traveled
and the block would have this length of 'track' to go back to the bottom.

So, again you can use (1) to solve for vf
(which must equal to 3.43m/s, to the opposite direction)

i don't get what is 'T' used for question a
your working for b is correct but i get 0.651s as my answer, using the same working
 

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top