Thursday

October 30, 2014

October 30, 2014

Posted by **rav** on Saturday, July 15, 2006 at 1:05pm.

The particle is initially at a position given by vector 2i+j

iv calculated the cartesian components of F1 and F2

F1 = 3i+6j

F2 = i 2j

iv also calculated the cartesian component of the total force F1+F2 = (3i+6j)+(i-2j) = 4i +4j

however the part im struggling on is that now the particle is of mass 1kg and is initially at rest, i have to use newtons 2nd law to write down an equation of motion and find the position of the particle after 1second.

so far iv tried:

F=ma

F1+F2= 1a

therefore a = 4i+4j but then i dont know how to find the new posistion ...can anyonehelp thankz

where acceleration= force/mass, and you have force and mass.

all the above of course is a vector equation, not messy at all. You can work the i,j components as separate equations, as the system is orthogonal. If needed, I can critique your work.

thankz iv worked it out

Assuming you have calculated the "a" vector correctly, just multiply it by t^2 to get the vector position change at time t. You do not have to add a term for (initial velocty vector) times t,, because the mass was initially at rest.

Add the position change vector to the initial position coordinates to get the new location.

I forgot about the factor (1/2) when calculating the position change due to acceleration. Bob Pursley's answer, posted just before mine, is correct

I have no clue.

**Answer this Question**

**Related Questions**

maths/physics - particle of mass m kilograms is acted on by two forces F[1] and ...

mechanics - A particle of mass 10 kg is acted on by a resultant force, F newtons...

Physics - A particle is acted upon two forces given by the vector equations, F1=...

Mechanics A level? - A particle P lies on a smooth horizontal surface. It is ...

MATH116 - Two forces of magnitudes 60 Newtons and 80 Newtons make an angle of 30...

Physics - Three forces are applied to a mass. Force 1: +3 Newtons Force 2: -3 ...

physics - Two forces of magnitude 20 newtons and 25 newtons respectively act at ...

Physics - A mass of 8 kg lies on a horizontal, frictionless floor. A force of 72...

Physics 1 - A mass of 8 kg lies on a horizontal, frictionless floor. A force of ...

physics - A mass of 8 kg lies on a horizontal, frictionless floor. A force of 72...