Torque help

  • Thread starter Drakon25th
  • Start date
  • #1
Drakon25th
Hello,
Alright, this is the problem:
Calculate the torque about the front support of a diving board exerted by a 70kg person 3.0m from that support
here's the picture:

________________person
|<-1.0m->|<--3.0m-->:

^ ^ ^
| | |
F1 F2 CG
Alright this is what i have done so far:

[tex]\sum T = 0 [/tex]

[tex]\sum T = m*g*d_F1-F2 - m_p *g*d_F2-person = 0[/tex]

[tex]\sum T = m*g* 1.0m - 70.kg * g *3.0m = 0[/tex]

[tex] m*g*1.0m = 70.kg*g*3.0m[/tex]

[tex] m = (70.kg*g*3.0m)/(g*1.0m)[/tex]

[tex]m = 210kg [/tex]

I know the answer is supposed to be 2.1 x 10^3 m*N, but i don't know what to do after finding the mass on F1; can someone help me?
 
Last edited by a moderator:

Answers and Replies

  • #2
ShawnD
Science Advisor
668
1
Originally posted by Drakon25th
Calculate the torque about the front support of a diving board exerted by a 70kg person 3.0m from that support

force from gravity:
70 * 9.81 = 686.7N

torque:
686.7 * 3 = 2060.1Nm
 
  • #3
Drakon25th
ooh i see, thank you :smile:
 

Related Threads on Torque help

  • Last Post
Replies
7
Views
2K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
2
Views
7K
  • Last Post
Replies
15
Views
5K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
5
Views
3K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
4
Views
1K
Top