Force, Torque, Work

Question 1

Newton’s first law

Answer 1

Fnet = 0 at equilibrium

objects will remain at rest or constant velocity unless and external force acts upon it

Question 2

Newton’s second law

Answer 2

Fnet = ma

the total sum of forces acting on an object is equivalent to its mass times its acceleration

Question 3

Newton’s third law

Answer 3

Fab = -Fab

when body A exerts a force on body B, body B exerts and equal and opposite force on body A

Question 4

How do you calculate center of mass when there are multiple forces operating on a single system with multiple masses?

Answer 4

Xcenter = m1x1 + m2x2 + … mkxk / m1 + m2 + … mk
your set of masses are multiplied by the distance from their reference point, and then divided by the total sum of the masses to get the center of mass

Question 5

Static Friction

Answer 5

Fstatic = μsN

Fapplied < Fstatic

Question 6

Kinetic Friction

Answer 6

Fkinetic = μkN

Fapplied > Fstatic

Question 7

Centripetal acceleration

Answer 7

a = v^2/r

Question 8

Centripetal force

Answer 8

Fc = mg = mv^2/r

g = v^2/r

Question 9

Gravitational force

Answer 9

Fgrav = Gm1m2/r2

G = gravitational constant = 6.67 x 10 ^-11 m3/kg * s2

Question 10

Hooke’s law

Answer 10

Fspring = kx