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Bike Shop 3-5 / Week 09 / Thursday
4/6
Week 09 Β· Be Seen

Thursday

Reflectors
// Light, reflectors and bright colors
⏱ about 15 min

Thursday: Reflectors

Rocket shines a flashlight at the back of the shop bike. The red reflector blazes bright.

"Whoa! It glows right back at me!" he says.

Raven steps to the side. "What do you notice from over here?"

From the side, the glow looks dim.

Nova hovers by the flashlight. "Where does a reflector send light?" she asks.

Light goes back the way it came

A bike reflector is a special kind of reflector.

It sends light back in the direction it came from.

So a driver's headlights shine on it, and light comes back toward the driver.

The same kind of reflector is in car tail-light covers and road sign paint.

Reflectors like this are even on the Moon!

Where bike reflectors go

U.S. safety rules say bikes must come with reflectors.

They help people see a bike in car headlights.

Spot on the bikeReflector color
front, facing forwardclear (no color)
back, facing behindred
pedals, front and back of eachclear or amber (yellow-orange)
sides of the wheelson the spokes, or a reflective tire side
REFLECTOR CHECK
  • Read the question.
  • Tap your answer.
Which way does a bike reflector send light?
What color is the reflector on the back of a bike?
Why did the glow look dim to Raven at the side?
The front reflector is ____ (no color).
Reflectors are on the front and back of each ____.
Try it
Look at a bike picture, or a family member's bike with their OK.
A grown-up holds the bike still.
Count the reflectors you can find.
In a dim room, a grown-up shines a flashlight at one reflector.
Safety first
The bike stays still. Do not spin the wheels or pedals.
Keep hands away from the chain and spokes.
Shine light only at the reflector, never at eyes.
No bike? Find reflectors on the table and count them.
SpotReflector found? (yes or no)
front
back
pedals
wheels
StatementTrue or false?
A bike reflector makes its own light.?
Reflectors help drivers see a bike in headlights.?
The back reflector is red.?
Road sign paint can use the same idea.?
WHY THIS EXERCISEA reflector bounces light back. It does not make light.

Reflector rangers! Tomorrow we compare reflectors with lights and plan a be-seen kit.

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