Does anyone know how to solve i try to self learn?

[sammy852]

The equations used are:
1)ΣF=ma
2)fk = μkN
3)fs ≤ μsN
4)Fs = - kx

Here are the questions:
1. If ΣF is 10N and a=1 m/s^2, find m using the first equation
2. Given ΣF = fk, m=250 kg, μk=0.2, and N = 10m, find a.
3. ΣF=T-10m, but a=0 m/s^2. Use the first equation to find m in terms of T.
4. Given the following values, determine if the third equation is valid. ΣF =fs, m=90kg, and a=2 m/s^2. Also, μs=0.1 and N=5N.
5. Use the 4th equation to solve for F, if k=900 N/m and x=0.15m
6. Use this equation ( vf=v0+at) and (ΣF=ma) find ΣF when m=12kg, vo= 15m/s,vf=5/ms and x=0.15m

 

[denjay]

Well let's start with the first problem,

You know:
ΣF = 10N
a = 1 m/s^2
m = ?

And better yet, you know you have to use ΣF = m*a

Are you familiar with how to solve for a variable in an algebraic equation?

For example, can you solve for x in this equation?

6x = 52