Lecture 3 (Center of Mass, Uniform Circular Motion, Torque, Equilibrium,Rotational Inertia) Flashcards Preview

MCAT Physics > Lecture 3 (Center of Mass, Uniform Circular Motion, Torque, Equilibrium,Rotational Inertia) > Flashcards

Flashcards in Lecture 3 (Center of Mass, Uniform Circular Motion, Torque, Equilibrium,Rotational Inertia) Deck (7):
1

Center of Mass for Point Masses

x_cm= (m1x1 + m2x2 + m3x3...+ MX)/(m1+m2+m3...+M)

2

Center of Gravity

is the point at which the total gravitational force on the system can be considered to act.

if gravity is constant then center of gravity=center of mass because g cancel

3

Center of Gravity equation

X_CG= (w1x1 + w2x2 + w3x3...+ WX)/(w1+w2+w3...+ W)

4

Uniform Circular Motion UCM

an object moving in a circular path is said to execute uniform circular motion if its speed is constant
velocity's direction is always changing due to acceleration. velocity's magnitude remains constant.

5

Centripetal acceleration

the acceleration of an object undergoing UCM always points toward the center of the circle.

6

Magnitude of Centripetal Acceleration

a_c= (V^2)/r

7

Magnitude of Centripetal Force

F_c= m(a_c)= (mV^2)/r