air resistant

air resistant

What is air resistance?

When an object moves through air, there is a force on it called air resistance. Most of the time you don’t really notice it. If the air is moving very fast, or you are moving very fast through the air, then you notice the effect.

Multiple Choice

Air resistance is a force caused by...

• Water pushing against moving objects

• Air pushing against moving objects

• Gravity pushing against moving objects

• Normal force pushing against moving objects

Multiple Choice

Air resistance pushes against falling

objects and __________________.

• Speeds them up

• Keeps them afloat

• Slows them down

• Spins them

Multiple Choice

Another name for air resistance is...

• Buoyancy

• Streamline

• Gravity

• Drag

Reducing air resistance

Air resistance can be a problem. It is a form of friction that slows things down

. Air resistance is less if the area in contact with the air is reduced.

Streamlining reduces air resistance by changing the flow of air over a car or plane.

Multiple Choice

Which has more air resistance?

Multiple Choice

The more streamlined an object is, the...

• More air resistance

• Less air resistance

• Slower air resistance

• Faster air resistance

Using air resistance

Air resistance can be very useful for slowing things down.

A parachute increases the area that is in contact with the air and therefore increases the air resistance

Multiple Choice

The larger the surface area of the moving object, the ___________ air resistance there is.

• Less

• More

• Longer

• Quicker

When a parachutist jumps out of a plane she accelerates because of the force of gravity acting on her.

As she speeds up the air resistance increases

until it balances her weight.

She then falls with a steady speed called the terminal velocity

Multiple Choice

The larger the parachute the ____________

• Less air resistance

• More surface tension

• Less drag

• More drag

Multiple Select

Which two of these forces act on parachutes?

• Air Resistance

• Gravity

• Thrust

• Kinetic Energy

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