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

Last one I PROMISE! gravity question

  • Thread starter ladolce
  • Start date
  • #1
56
0

Homework Statement



A rock of mass 32 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 242 N. What is the magnitude of the acceleration of the rock?

Homework Equations



F=ma (?)

The Attempt at a Solution



I just did 242 N/32 kg and thought that was good but apparently that's not right?
 

Answers and Replies

  • #2
malawi_glenn
Science Advisor
Homework Helper
4,786
22
The SUM of all forces is: F = ma

so you find the force acting on the rock directed down wards, and upwards; the you will get the sum of the force acting on the rock.
 
  • #3
HallsofIvy
Science Advisor
Homework Helper
41,833
956
There is a downward force of mg and an upward force of 242 N.
 
  • #4
56
0
that's what i thought of later too, but how much force does gravity exert in N?
 
  • #5
56
0
OK, I got the answer.
Thank you.
 

Related Threads on Last one I PROMISE! gravity question

Replies
4
Views
1K
Replies
4
Views
2K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
16
Views
5K
  • Last Post
Replies
7
Views
1K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
7
Views
1K
  • Last Post
Replies
3
Views
1K
Replies
14
Views
3K
Replies
0
Views
2K
Top