http://www.ck12.org Chapter 7. Momentum
http://www.pbs.org/opb/circus/classroom/circus-physics/angular-momentum/
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/62083- Why do the fliers scrunch up in the air while spinning and twisting?
- What happens to the rate at which they spin when they change shape in the air?
Review
Questions
- Billiard ballA, mass 0.17 kg, moving due east with a velocity of 4.0 m/s, strikes stationary billiard ballB, also
mass of 0.17 kg. After the collision, ballAmoves off at an angle of 30° north of east with a velocity of 3.5
m/s, and ballBmoves off at an angle of 60° south of east. What is the speed of ballB? - A bomb, originally sitting at rest, explodes and during the explosion breaks into four pieces of exactly 0.25 kg
each. One piece flies due south at 10 m/s while another pieces flies due north at 10 m/s.
(a) What do we know about the directions of the other two pieces and how do we know it?
(b) What do we know about the speeds of the other two pieces and how do we know it? - In a head-on collision between protons in a particle accelerator, three resultant particles were observed. All
three of the resultant particles were moving to the right from the point of collision. The physicists conducting
the experiment concluded there was at least one unseen particle moving to the left after the collision. Why did
they conclude this?
The momentum of an object, in physics terms, is mass multiplied by velocity. The impact of an object in a collision
is the force it applies multiplied by the amount of time that impact is applied for. Whether movement is in one or two
dimensions, the momentum of objects in a closed system is always conserved. The equations for this relationship
were presented in this chapter.