Unit 3: Circular Motion and Gravitation

Question 1

g

Answer 1

acceleration due to gravity
-speed changes by 10 meters per second every second in free fall
-or gravitational field strength
-10 N per kg
-vectors pointing down

Question 2

solve for gravitational force

Answer 2

fg= G (m1m2/ r^2)

Question 3

intertial mass

Answer 3

measures an object’s resistance to being accelerated by a force
-law of inertia=newton’s 1st law

Question 4

gravitational mass

Answer 4

-property of an object that determines the strength of gravitational interactions
-determines the amount of force exerted on an object by the gravitational field
-more mass= stronger gravitational force
Fg= G(mM/r^2)

Question 5

how to measure gravitational mass

Answer 5

(need grtavity)
1. scale/balance
2. spring scales

Question 6

measure inertial mass on a spring

Answer 6

T= 2π√(m/k)
T= period/ how much time it takes to complete one cycle
k= spring stiffness

Question 7

measure inertial mass on mass experiencing a force

Answer 7

a=Fnet/m

Question 8

Uniform circular motion speed

Answer 8

constant

Question 9

UCM velocity

Answer 9

changing w/ direction change, tangent to the path

Question 10

UCM acceleration

Answer 10

yes b/c direction is changing

Question 11

UCM average speed

Answer 11

(2π r)/t

Question 12

centripetal acceleratoin

Answer 12

component of acceleration that points toward the center of the circular motion or perpendicular to velocity vector
ac=v^2/r

Question 13

centripetal force

Answer 13

causes/leads centripetaltowards acceleration, always pointing twors the center
fc=m(v2/r)