Unit 5

SI units/symbols

100

What is the SI unit for momentum?

kg(m/s)

200

What is the SI unit for angular speed?

rad/s

300

What is the SI unit of angular acceleration?

rad/s^2

400

What is the symbol for centripetal force?

F_c

500

What is the symbol for angular acceleration

𝛼

Equations

100

what is the equation for momentum 

P=m x v

200

what is the equation for elastic collisions?

m_a v_ai+m_bv_bi=m_av_af+m_bv_bf

300

What is the equation for angular speed?

𝜔_ave = Δ𝛳/Δt

400

What is the equation for impulse momentum?

Δp=FΔt

500

What is the equation to calculate leaving orbit?

vt = √(Gmp/r)

Conceptual problems

100

Why would you want to have your momentum slow down over a longer time

so there is less force

200

Why does the outside of a circle move faster?

it is moving the the same amount of degrees but it  is a further distance.

300

If two people push off each other on ice skates with different forces who has more momentum?

it is the same

400

Why does light not escape a black hole?

Because the escape velocity is faster than the speed of light

500

Why do they make cannons heavier?

Because it takes more force to move, meaning it  stays still easier.

Momentum

100

What is momentum?

quantity defined as the product of the mass and velocity of an object

200

What variable represents momentum?

p

300

What is the momentum of and object with zero velocity?

zero

400

The idea that momentum is always constant is known as this.

Law of Conservation of Momentum

500

What are the three types of collisions?

inelastic, elastic, and somewhat inelastic

Rotational Motion

100

What does S equal

Arc length

200

How many radians are in a circle?

6.28 rads or 2pi rads

300

Is angular speed the same for all parts if the circle?

yes

400

What symbol represents angular speed?

𝜔 (omega)

500

This is the tendency of an object to resist a change in its rotational speed. 

rotational inertia.