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Science for Leonardo 4 pages
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Is it easy to run in water?
No, human bodies are not streamlined.
Name two animals which have streamlined bodies.
sharks and fish
What does water resistance do to moving objects?
slows them down
In order to travel slower through air, what do you need?
a large surface area
In order to travel faster through air how should your shape be?
streamlined
What does air resistance do to moving objects?
slows them down
What does friction produce? plus example
heat - rubbing your hands together
What surfaces don't create lots of friction?
smooth surfaces - ice
What surfaces create lots of friction? plus example
rough surfaces - roads
When does friction occur?
When two surfaces touch
Is friction a force?
yes
What materials are not attracted to magnets?
Brass, aluminum and wood
What materials are attracted to magnets?
Iron and steel
Do two south poles or two north poles attract or repel?
repel
Do a North and South Pole attract or repel each other?
attract
What does a magnet have?
a North Pole and a South Pole
Do most forces need contact between objects?
Yes
Do magnetic forces need contact or can they act at a distance?
At a distance - don't need contact.
What can forces make you do?
1. speed up, 2. slow down, 3. change direction, 4. change shape
What is a force?
A push or a pull.