Ch. 8: Momentum
Reading
College Physics, Ch. 8
AP Classroom: Unit 5 "Momentum"
Topics
Labs
College Physics, Ch. 8
AP Classroom: Unit 5 "Momentum"
Topics
- Momentum is "mass in motion"
- We will study problems involving momentum and various kinds of collisions
Labs
- Collision lab
Below: "Conservation of Momentum" as illustrated by the collision of two objects at a picnic, one larger than the other.
The Big Ideas
Momentum is "mass x velocity" (p = mv).
Thus, it can be thought of as "mass in motion".
We use the letter "p" for momentum, because the Latin word 'petere' means "to go to", "to attack". It's where we get the words "impetuous, petulant, and impetus"
"Impulse" is a concept Newton came up with to develop his 2nd Law of Motion. We normally write the 2nd Law as "F=ma", but Newton originally expressed it using impulse, as in "Impulse = Change in momentum = force x elapsed time".
From that, you can also say "Impulse = Change in momentum = mass x change in velocity".
Here's a handy chart, below:
Momentum is "mass x velocity" (p = mv).
Thus, it can be thought of as "mass in motion".
We use the letter "p" for momentum, because the Latin word 'petere' means "to go to", "to attack". It's where we get the words "impetuous, petulant, and impetus"
"Impulse" is a concept Newton came up with to develop his 2nd Law of Motion. We normally write the 2nd Law as "F=ma", but Newton originally expressed it using impulse, as in "Impulse = Change in momentum = force x elapsed time".
From that, you can also say "Impulse = Change in momentum = mass x change in velocity".
Here's a handy chart, below:
Collisions
Many homework problems from this chapter are dealing with "collisions".
Rule #1: Total momentum is conserved in all types of collisions. "Conserved" means total momentum "doesn't change".
Rule #2: In an "elastic" collision (perfect billiard balls), both Kinetic Energy and momentum are conserved.
Rule #3: In an "inelastic" collision (billiard balls covered with Velcro), only momentum is conserved. Kinetic Energy is not.
Many homework problems from this chapter are dealing with "collisions".
Rule #1: Total momentum is conserved in all types of collisions. "Conserved" means total momentum "doesn't change".
Rule #2: In an "elastic" collision (perfect billiard balls), both Kinetic Energy and momentum are conserved.
Rule #3: In an "inelastic" collision (billiard balls covered with Velcro), only momentum is conserved. Kinetic Energy is not.
Collision lab
I will have instructions for this popular weblab when we get here.
Homework
Your homework is hosted in Canvas, along with the due dates.
I will have instructions for this popular weblab when we get here.
Homework
Your homework is hosted in Canvas, along with the due dates.