Unit 6

SI units

100

What is the SI unit if torque

N(m)

200

What is the SI unit of inertia 

Kg∙m²

300

What is the SI unit of angular velocity 

kg(m²/s)

Equations

100

What is the equation for torque

𝜏 = Fd(sin𝜃) or 𝜏 = Fr(sin𝜃)

200

What is the equation for angular momentum

L = I𝜔

300

What is the equation for rotational kinetic energy

KE_r = 1/2 Iw^2

Conceptual

100

Why do you get faster if you move towards the center of a spinning circle 

because the torque has to equal out, so if the radius gets smaller there is more force

200

What provides the centripetal force for a car driving around a circular track?

friction

300

Math Question: Which has more rotational inertia: 

A.) A solid metal sphere with mass 5 kg and radius 10 cm, rotating on its axis. or 

B.) A solid metal sphere with mass 10 kg and radius 10 cm, rotating on its long axis.

B

Rotational Motion

100

What is the tendency of an object to resist a change in its rotational speed?

rotational inertia

200

What is the term for forces which point towards  the center of a circle?

centripetal or radial forces

300

Linear motion is caused by force, in the same way that rotational motion is caused by ________

torque