What number do we use for π?

• 3.14

• 1

• 2

• 10

How can you find the distance around a circle?

• 2πr

• d/t

• v²

• T

What is T?

• the amount of time it takes to complete one circle

• mass

• velocity

• radius

What is v?

• velocity

• period

• radius

• acceleration

Tags

NGSS.HS-PS2-1

How did we find r in our experiment?

• length of the string

• time it took to go around one time

• mass of the stopper

What is the equation for velocity?

• v = 2πr/T

• a = v²/r

• F = mv²/r

• F = ma

What force keeps an object moving in a circle?

• centripetal force (inward)

• centrifugal force (outward)

What happens if you let go of the string when you spin the stopper around your head?

• the stopper continues moving in a circle

• the stopper moves in a straight line

Tags

NGSS.HS-PS2-1

What is the equation for acceleration?

• v = 2πr/T

• a = v²/r

• F = mv²/r

• F = ma

Tags

NGSS.HS-PS2-1

What is the equation for centripetal force?

• v = 2πr/T

• a = v²/r

• F = mv²/r

• F = ma