Momentum Lesson 1 Objectives q define momentum as

Momentum Lesson 1

Objectives q define momentum as a vector quantity equal to the product of the mass and the velocity of an object

Momentum u quantity of motion conserved in all collisions (What does “conserved” mean? ) u Vector - direction is important u defined as the product of mass and velocity.

Look at Conservation of Energy u The sum of all energy in an isolated system remains the same u Energy is never created or lost, just changed in form u Momentum also has this property

In 1000 AD, Sina described the quantity of momentum as impetus

MOMENTUM The quantity for an object is its momentum The symbol is Units of Momentum: kgm/s or Ns Where p = momentum in kgm/s m = mass in kg v = velocity in m/s *

Example 1: What is the momentum of a 680 g toy train moving at 28. 9 cm/s east? Example 2: If the momentum of a 0. 374 kg softball is 5. 89 kg·m/s W, what is its velocity? *

Example 3: If Glen’s momentum is 146 kg·m/s R at a speed of 3. 74 m/s, what is Glen’s mass? Example 4: If Tom’s mass with his bike is 61. 4 kg and he speeds up from 4. 17 m/s N to 9. 49 m/s N, what is Tom’s change of momentum? *

Momentum and Newton’s Second Law u Newton actually had momentum figured out in u Lets look at that acceleration!

Newton’s Second Law u This means that any change in momentum results in a change in force. u This is actually how Newton defined his second law

Proportionalities and Momentum u Example 1: If the mass of a moving object is doubled, what is its new momentum?

u Example 2: If the speed of an object is reduced by a factor of 4, how has its momentum changed?

Assignment: Physics 30 Workbook: P 40 #1 – 8 Reading from Textbook: