14. Circular Motion

Question 1

For objects traveling in a straight line, we talked about different variables that influenced motion, define and include the equations.

Answer 1

Distance/Displacement: Change in position, Δx, Δx =x₂ - x₁ , m (meters).

Velocity: Change in position over change in time, V_x V_y - V = Δ_x / Δ_t - m/s

Acceleration: Change in velocity over change in time, a_x a_y a = ΔV / ΔT - m/s²

Forces: Push or pull - F - F=ma - N

Question 2

What is the speed of the motion an object in a circle?

Answer 2

a constant speed.

ENCODE

[S-E-H-A-E]

Question 3

d or x for a circle can be thought of as the…

Answer 3

circumference or at least part of it.

ENCODE

[S-E-H-A-E]

Question 4

What is the equation and the unit of a circumference?

Answer 4

c = 2πr and m

ENCODE

[S-E-H-A-E]

Question 5

What is the equation and the unit of Period?

Answer 5

T= time to do the # of cycles / the # of cycles and the unit of period is “s”

ENCODE

S-E-H-A-E

Question 6

What is the equation and the unit of frequency?

Answer 6

ƒ = #cycles / 1 second and Hz

Question 7

Define tangential velocity

Answer 7

tangential velocity is the linear velocity of a single point at a single point in time. For this reason, this velocity will always be tangent to the circle.

ENCODE

S-E-H-A-E

Question 8

What is the equation for tangential velocity?

Answer 8

V_TAN = 2πr / T or V_TAN = 2πrf

Question 9

Differentiate centripetal acceleration and centrifugal acceleration together.

Answer 9

centripetal acceleration is the acceleration of an object towards the center of the circle while centrifugal acceleration is an acceleration outwards the circle which is fictitious because it is not real!

ENCODE

S-E-H-A-E

Question 10

What is the equation and the unit of centripetal acceleration?

Answer 10

a_c = V_TAN² / r and m/s²

Question 11

If we have a mass and are experiencing an acceleration that means we are experiencing a FORCE, what are the equations of this force?

Answer 11

F_c=ma_c or F_c=mV_TAN² / r