Frictional forces

Which two of these forces act on parachutes?

• Air Resistance

• Gravity

• Thrust

• Kinetic Energy

What causes an object to fall faster?

• Smaller surface area

• Larger surface area

• If it has a parachute

• If it is softer

Another name for air resistance is...

• Buoyancy

• Streamline

• Gravity

• Drag

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

• Less

• More

• Longer

• Quicker

Air resistance pushes against falling

objects and __________________.

• Speeds them up

• Keeps them afloat

• Slows them down

• Spins them

The larger the parachute the ____________

• Less air resistance

• More surface tension

• Less drag

• More drag

Which has more air resistance?

• 
• 

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

The more streamlined an object is, the...

• More air resistance

• Less air resistance

• Slower air resistance

• Faster air resistance

What name is given to a substance which reduces friction between two surfaces?