Mass & Inertia
1st Law of Motion
Inertia — an object's resistance to a change in motion due to its mass.
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Try This at Home
Why does the ping pong ball accelerate more than the golf ball?
Newton's 2nd Law
When the Net Force > 0
The acceleration of a body depends directly on the net force acting on it and indirectly on the body's mass.
Mass and Inertia
More Mass
Less Mass
Feeling Inertia
“Why is it initially so difficult to pedal a bike when you start from rest?”
“And why is it so easy to pedal the bike once you obtain your desired speed?”
Inertia — When you first start pedaling you are feeling the inertia of the bike and body. (force required to change motion)
Once in motion you only need to apply a force to offset friction.
“Why are the most massive (most inertia) football players lineman?”
“Why are the least massive (least inertia) football players receivers?”
“Receivers want to change motion, lineman want to hold their ground”
Simulations & Games
Show Me The Physics
Show Me The Physics
Egg Drop — Inertia in Action
Onsite Krampf
Ranking Task
Rank the carts below from greatest inertia to least. Explain your answer.
