Lesson plan

Forces: chains of forces and combining forces

Introduce forces with the coin game. Coin game and catapult to show chains of forces. Air resistance with older students to show forces combining.
Science content
Physics: Motion and Forces, Newton’s Laws, Gravity (K, 2, 6)

Force makes things move. A push or a pull.

Start with coin game.
Summarize that there is a chain of forces between the coins that make them move in different directions.

Another chain of forces in a catapult.
Ks make torsion catapult (minimal adult assitance needed).
2s make tin can catapult.
Allow free play and measuring and recording of distances, before regrouping to discuss the specifics of the chain of forces, before more free play.
Forces make the foil balls move, and also make them eventually stop.

2s continue with balancing forces:
We have seen that forces make things move, and that forces make things stop.
The balancing of opposite forces determines whether something will stop or slow down. When something rolls along the floor, the forward movement is balanced by the friction against the floor. When something is falling the force of gravity is balanced against air resistance, pushing up against the object.
Air resistance activity.

Grades taught
Gr K
Gr 1
Gr 2