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Friction and Drag
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The _______ of gas push against things which are moving and create a force.
particles
What force or forces are acting on an falling object?
gravity and drag
How can we make a parachute to fall more slowly?
to make the parachute's surface area bigger
The larger the surface area of the moving objects, the ______ acting on them.
larger air resistance or drag
Air is a mixture of _____.
gases
Air resistance is a force pushing against ______ objects.
moving
Air resistance is also known as _____
drag
Objects move more distances with ____ friction than ____friction.
less & larger
Suggest a way to reduce a friction in the condition you are about to carry big boxes.
use trolley
Friction is stronger in ___ surfaces than ____ surfaces
bigger & smaller or rougher &smoother
Suggest a way to reduce the friction between your body parts.
using lotion, powder, or lubricating oil
Suggest two ways to reduce friction in every case.
rolling, lubricatiing
Due to friction over time, the car tyres _____.
wear out
In our daily life, friction is _______.
useful or problematic
Slippery floor has _____ frictional force.
low
What happen if you rub your hands for 60 sec.
get hotter,
Friction is a ____ that tries to make moving things slow or stop.
force


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