Question

Please help
http://oi67.tinypic.com/2mgozms.jpg

Answer 1

@matt101

Answer 2

@ganeshie8

Answer 3

maximum magnitude a static friction force between the box
and truck bed can have is f(max)=mui*normal
normal is basically mg
But you also have to use newtons laws on this problem.
F=ma
^ in this case you set the force equal to the frictional maximum force. So thats then mui(mg)=ma
If you solve for acceleration, the masses cancel out. So you have left:
a=mui*g

Answer 4

in this case your mui due to static friction is 0.51

Answer 5

I hope this helped.

Answer 6

Okay so (.51N)(9.81*351)

Answer 7

No the mass gets canceled out because of the newtons formula.

Answer 8

Okay so just (.51N * 9.81)?

Answer 9

thats not a N, thats mui.

Answer 10

http://www.mrwaynesclass.com/ap/Ch4_freebody/CH04W59.pdf. Look at how this page derives the equation.

Answer 11

404 error

Answer 12

So you wouldn't find acceleration by multiplying the gravity by mui?

Answer 13

@AlexandervonHumboldt2

Answer 14

Wheres the error404 coming from :)

Answer 15

It did that when I clicked on it.

Answer 16

@aaronq

Answer 17

http://www.mrwaynesclass.com/ap/Ch4_freebody/CH04W59.pdf

I think the extra spaced messed up the link.

Answer 18

just copy and paste the link withouth the extra spaces.

Answer 19

@Compassionate

Answer 20

For this would I just take (.51)(9.81)=5.0031

Answer 21

Always start with:


From there, you know that Force of gravity is equal to the normal force, since the object will only move horizontally. So the y-components of force will be equal to zero:

Fnormal - Fgravity = 0 N -->eqn 1

To solve for the Friction Force which is required to solve for the maximum acceleration, you need the formula for the normal force. From the eqn 1, rearrange it in terms of Fnormal:

Fnormal = Fgravity
Fnormal = mass x acceleration due to gravity (SO CALCULATE THIS FIRST- just leave the mass as variable "m" for now)

The formula for the Friction force is:

where Fn is the normal force,
µ is the coefficient of friction

Subsitute the values and solve for Ff.

NEXT SOLVE FOR ACCELERATION:
According to Newton's second law, the object must move on the direction of the friction force, since it is the only force remaining that will cause the object to move:

Ff = mass x acceleration

rearrange the formula and you'll get :
acceleration = force / mass

variable 'm' should cancel out.