KINS 4200 Exam 3 Linear Kinetics III

free body diagram

sketch of a defined system in isolation with all force vectors acting on the system

which forces you draw depends on how you define the system

centripetal force

force that causes athletes centripetal acceleration when going around corner

line of application is towards the center of the circle

formulas for centripetal force

F_c = mv² / r OR F_c = mw²r

momentum

effect of force applied over a period of time

momentum equation

mass x velocity

p = mv

collision

exchange of a large force over small time interval

↑ momentum = ↑ resulting effect

inelastic collision

collision resulting in the total loss of system velocity

momentum is conserved and objects stick/move together instead of bouncing apart

elastic collison

objects bounce off of eachother cleanly without sticking or deforming

both momentum and kinetic energy are conserved

impulse

change of momentum over time

unit: Ns

impulse equation

impulse = force x Δtime

impulse-momentum relationship

impulse applied to an object is equal to the change in its momentum

Δp = force x Δtime

mv_f - mv_i = FΔt