Active learning ideas
This unit focuses on friction and air resistance as forces that oppose motion. Students investigate how the texture of surfaces affects the ease of movement and how the surface area of an object influences its speed through the air. This falls under the NCCA 'Energy and forces' strand, emphasizing 'Investigating and experimenting' through fair testing.
Activity 01
Groups set up ramps with different surfaces (sandpaper, carpet, foil, wood). They measure how far a toy car travels after leaving the ramp to determine which surface has the most friction.
How does friction help or hinder movement?
Activity 02
Students build parachutes of different sizes and shapes. They test them by dropping them from a height and then explain to the class how surface area affects air resistance and fall speed.
Which surfaces produce the most friction?
Activity 03
Students list three situations where they want more friction (e.g., football boots) and three where they want less (e.g., a slide). They share their reasoning with a partner.
How do parachutes use air resistance to slow down?
A few notes on teaching this unit
Watch Out for These Misconceptions
Friction only happens when things are moving.
Static friction exists even when things are still, preventing them from starting to slide. Trying to push a heavy box on different floors helps students feel the 'grip' before movement begins.
Air doesn't have any mass or resistance.
Air is made of particles that objects must push out of the way. Running with a large piece of cardboard held in front versus at the side gives students a physical 'feel' for air resistance.
Methods used in this brief
Gravity and Weight
Students explore the concept of gravity as a force that pulls objects toward the Earth. They differentiate between mass and weight.
8 methodologies
Levers and Simple Machines
Students learn how simple machines like levers and pulleys make work easier. They design and build their own simple mechanical devices.
8 methodologies