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

Physics lab on energy need help

  • Thread starter astru025
  • Start date
  • #1
163
0
Physics lab on energy need help!!

Homework Statement



Need to find velocity and time when I know all lengths/heights. Need to look at picture to fully understand my problem.

Homework Equations



Projectile motion equations... And velocity equations..

The Attempt at a Solution


On picture
 

Attachments

Answers and Replies

  • #2
Pythagorean
Gold Member
4,191
255
Since you know the height of the ramp, you know the potential energy which all gets converted into kinetic energy coming off the ramp. Since you know the kinetic energy, you know the velocity... since you know the velocity, and the height of the table, you know how far it will go before it hits the ground.
 
  • #3
163
0
Ok so my kinetic energy would be mass x 9.8 x .05 (height of ramp). Is this right? I don't know the mass though.
 
  • #4
jtbell
Mentor
15,544
3,452
I don't know the mass though.
Maybe you'll get lucky and it will cancel or drop out of your solution. :wink:
 
  • #5
163
0
Okay so I came up with v^2= 2gh. 2 x 9.8 x .05 = .98 and the square root of .98 is .99. This is my velocity. Then to find my time do I divide my velocity by .75?
 
  • #6
Pythagorean
Gold Member
4,191
255
no, the velocity is is in the x direction right? How fast will it accelerate towards the ground in the y direction?
 

Related Threads on Physics lab on energy need help

  • Last Post
Replies
6
Views
1K
Replies
4
Views
2K
Replies
2
Views
4K
  • Last Post
Replies
1
Views
967
Replies
1
Views
4K
  • Last Post
Replies
10
Views
1K
  • Last Post
Replies
3
Views
5K
  • Last Post
Replies
1
Views
4K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
0
Views
770
Top