There is More to Cycling than just a Bicycle!

Picture From 3M

Explain clearly how clothes/gear with reflective material can help a person cycling at night?

Whenever you are unsure about how to answer a question, you can compare the situation to a reverse situation: here - wearing clothes with no reflective material.

HOLIDAY Fun!

During his holiday at Sentosa, Jason woke up at 6 a.m, jumped into the swimming pool and yelped,
"Wow! It's sooooo cold!"
He quickly got out and went back to the hotel room and jumped into his bed with his wet swimming trunks.
"OOH, this is so warm and toasty!"

What made Jason feel cold in the pool? (Remember, always connect to Science concepts).
What made Jason feel warm in bed?
Explain clearly why.(You can try to connect to a similar experience you had!)

Stones and this time - FOOD!

Nomadic tribes (people who move from one place to another) use stones to cook their food. Here bread is being cooked on stones that are placed on fire.

Explain how you think the stone helps the bread to cook.

How is the process different from using a metal wok for example?

Would the cooking time be different if several smaller stones were used instead of one large piece?

Stones and Health? Not Stone Age!

In Finland, people go to saunas (hot houses) as they believe it's a healthy way to relax. Stones are heated up inside a well ventilated (air can move in and out) room.

When the stones are ready after 2-3 hours reaching temperatures higher than 100C, water is poured on the stones.

Imagine what happens as soon as water touches the stones!

Explain what you think happens. (Remember steam can't be seen.)

How does this process help the occupants feel warm?

Why do people pour water on the stones instead of just warming the room up with a heater?

Shadow Puppets

Shadow Puppets
How do you think the shadows are formed?
What could cause the shadows to become blurred or coloured? 
Explain what tricks can be used to achieve bigger and smaller shadows.

Packing - think again!

Why are people often being advised to pack light when they travel?

What do you know about Science that helps in packing light?

Explain how this is achieved.

Do you think that in Science, the packaged clothes are truly lighter?

Share your thoughts.

Going Places?

A wollen sweater

A windbreaker

Alice is planning to go Country X at the end of the year. The temperature there ranges from about 13 degree Celsius to 22 degree Celsius.

1. What are the similarities between the choices above?
2. What are the differences between the two choices above?
3. Which of the above, a wollen sweater or a windbreaker, should she choose to bring along for her trip?
4. Give reason(s) for your choice.

Flasks and their Secrets!

Have you ever used or seen someone use a flask like the one on the picture?

They are called thermos flasks and people use them to contain either hot or cold beverages.

List the materials used and explain how they help in making this item useful?

In what ways do such flasks keep hot beverages warm and cold beverages cool?