- #1

c-murda

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**[SOLVED] Simple Physics Mass pulled by a Force**

## Homework Statement

Two part problem:

Part 1:

Show by calculations that the mass can not be lifted up from the ground

F=27.0

m=3.00kg

Angle= 30degrees

Part 2:

show by calculations whether the mass moves level along the ground, if the coefficient of static friction between the surface and the mass is .750 and the coefficient of kinetic friction is .400

attached is drawing...

## Homework Equations

## The Attempt at a Solution

i draw the FBD and get everything in terms of x an y

Fx=F cos 30 = m*a; 27.0 cos 30 = m*a; a = 7.79 m/s^2

Fy= Fn sin 30 - m*g = 0 ;Fn = (m*g)/(sin 30) , which equaled 58.8N

uhmm... or do i

w = m*g; 3.00*9.80 = 29.4

f sin 30 = 13.5

13.5> 29.4 so, obj doesn't move up or down?

im confused...

Part 2:

F=27.0

m= 3.00kg

Fs=.750

Fk=.400

I draw FBD and

F cos 30 = 23.4

Fx= F cos 30 - Fk = m*a; a = (27.0 cos 30 -.400)/3 = 7.66m/s^2

so the object moves right?