P1.1.3 - Drag Forces and Friction Flashcards

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1
Q

When are drag forces useful?

A

Parachutes use air resistance (a drag force) to slow down a fall.

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2
Q

Rough surfaces have ______ friction.

A

more

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3
Q

When is friction a bad thing?

A

Friction that wears down a bike chain.

Carpet burns

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4
Q

What is friction?

A

A force that acts when two force against each other.

Friction causes grip.

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5
Q

Smooth surfaces have _______ friciton.

A

less

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6
Q

How can you reduce drag forces?

A

Have a streamlined shape.

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7
Q

Name the two drag forces.

A

Air resistance

Water resistance

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8
Q

How can you reduce friction between 2 surfaces?

A

Use lubrication e.g. oil

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9
Q

When is friction a good thing?

A

Friction between your shoe and road to allow you to walk.

Friction between bike/car brakes and the wheels to allow you to stop.

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