IB SEHS Topic 4.3

When an object spins it is said to undergo ______________.

• rotational motion

• angular momentum

• axis differentiation

• rotational axis

When a figure skater starts a spin:

Arms outstretched: LARGE MOMENT OF INERTIA

As the skater brings the arms in: DECREASING THE MOMENT OF INERTIA

Which will make the skater spin faster?

• arms outstretched

• arms brought in

An athlete can jump higher off a solid surface because it opposes his body with as much force as he is able to generate, in contrast to sand or other unstable surface.

This is an example of one of Newton's Laws, which one?

• 1st

• 2md

• 3rd

Tags

NGSS.MS-PS2-1

Which object has the greatest momentum?

• An 18-wheeler tractor trailer at rest.
• An average mass person walking.
• A sports car driving on the highway.

Tags

NGSS.MS-PS3-1

What are the two factors that affect the momentum of an object?

• speed and velocity

• time and mass

• distance and displacement

• mass and velocity

ANGULAR MOMENTUM = MOMENT OF INERTIA X .........................

• speed

• angular velocity

• radius

• angular impulse

Angular momentum is conserved when no outside torques act on an object. As the moment of inertia decreases, the angular rotation has to .................. to keep the same angular momentum

• decrease

• increase

• remain constant

A bug on a turning phonograph record will make more turns per minute if it is located toward the center of the record.

• true

• false

At the end of a dive, the athlete opens up her body to increase___________________________ , which simultaneously decreases in___________________________ in preparation for entering the water.

• Moment of Inertia, Angular Velocity

• Angular Velocity, Moment of Inertia

• Angular Velocity, Angular momentum

why is the car on the right more stable?

• Its centre of mass is higher
• it has a wider base
• it has more height
• all of the above

Tags

NGSS.MS-ETS1-2