1PHYSICS I1. A) Work can be expressed by the following equation. W = F d cos where F is theforce, d is the displacement, and the angle (theta) is defined as the angle between theforce and the displacement vectorb) The unit of work is Joule(J)(c) A x B for A = 2i + 3j and B = 2i + 2j.Ijk2 30-2 20I((3x0) (2*0)) + j((2*0)-(-2*0)) + k((2*2)-(-2*3))10kAns 10k(d) A.B for A = 2i + 1j and B = 2i + 4j.A.B = (2)(-2) + (1)(4)=-4 + 4=0Angle between A and B= cos-1{A.B/IAI.IBI}= cos-1 {0/(5)(20)}=cos-1 0=90oe) if a force F is applied to the block the block slides to the right and the ball risesthe total force applied is given by Fx = F cos- fk -T =m2ax=m2aFy = n + F sin m2g = 02PHYSICS IFy = T -m1g = m1ay=m1an = m2g F sin fk = k(m2g F sin )F cos- k(m2g F sin ) m1(a + g) = m2aa = {F (cos + k sin) (m1 + km2)g}/m1 + m22. A) Kinetic Energy is the energy gained by an object in motion given by K.E = 1/2mv2where m is mass in kilograms and v is velocity in ms-2.Potential Energy is the energy an object has because of its position comparative to someother object given by P.E = mgh where m is mass, g is acceleration due to gravity and h isheight in metres.b) Torgue is the degree of change of angular momentum of an object measured innewton-metre and is given by T = rFsinc)FtNFtM1M1gM2gacc=(m1g-Ff-m2gx}/m1+m2Ff is frictional force given by m2gcos3PHYSICS ...
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