Alex is asked to move two boxes of books in contact with each other and resting on a rough floor. He decides to move them at the same time by pushing on box A with a horizontal pushing force F, = 9.3 N. Here A has a mass m, = 10.6 kg and B has a mass m. = 7.0 kg. The contact force between the two boxes is Fe. The coefficient of kinetic friction between the boxes and the floor is 0.02. (Assume F, acts in the +x direction.) mB (a) What is the magnitude (in m/s2) of the acceleration of the two boxes? m/s? (b) What is the force exerted on m, by m,? In other words what is the magnitude (in N) of the contact force F,?

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Angular speed, acceleration and displacement

Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.

Angular Position

Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.