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

Calculating acceleration of plane when given mass, friction force and Vi

  • #1
25
0

Homework Statement


A 2000 kg plane is landing at an airfield with an initial speed of 50 m/s. The force of friction is 1/4 the weight of the plane. What is the acceleration of the plane?

Homework Equations



Fnet = ma

Fnet = something - ff

The Attempt at a Solution



2000a = thing I don't know - ff, which is 500 n

So

2000a = ? - 500N

What force am I missing?
 

Answers and Replies

  • #3
SteamKing
Staff Emeritus
Science Advisor
Homework Helper
12,796
1,667

Homework Statement


A 2000 kg plane is landing at an airfield with an initial speed of 50 m/s. The force of friction is 1/4 the weight of the plane. What is the acceleration of the plane?

Homework Equations



Fnet = ma

Fnet = something - ff

The Attempt at a Solution



2000a = thing I don't know - ff, which is 500 n

So

2000a = ? - 500N

What force am I missing?
You're missing the fact that 500 N is ≠ 1/4 of the weight of the plane. Remember, 2000 kg is the mass of the plane, not its weight.
 

Related Threads on Calculating acceleration of plane when given mass, friction force and Vi

Replies
13
Views
637
Replies
1
Views
449
Replies
2
Views
3K
Replies
11
Views
7K
Replies
4
Views
4K
Replies
3
Views
561
Replies
4
Views
93K
Top