Frictional force

What is Friction?

• A force that pulls objects towards the Earth.

• A force that opposes the motion of objects.

• A force that pushes objects forward.

• A force that makes objects float.

Tags

NGSS.MS-PS2-2

Which of the following is an example of static friction?

• Sliding a book across a table.

• Rolling a ball down a hill.

• Pushing a heavy box that doesn't move.

• Riding a bike.

Which type of friction occurs when an object moves through a fluid like air or water?

• Static Friction

• Rolling Friction

• Kinetic Friction

• Fluid Friction

What type of surface would create the most friction?

• Rough and uneven

• Smooth and slippery

• Soft and cushioned

• Hard and flat.

How can you reduce friction between two surfaces?

• Make the surfaces rougher

• Make the surfaces smoother

• Apply more force

• Friction cannot be reduced

Which of the following is an example of rolling friction?

• Sliding a book across a table

• Riding a bike

• Pushing a heavy box that doesn't move

• Pulling a suitcase with wheels

What is one useful application of friction?

• Making ice slippery for ice skating

• Making cars go faster

• Reducing the wear and tear on machine parts

• None of the above

Why is friction important in sports?

• It makes the game more challenging

• It helps players grip the ball or ground

• It slows down the game

• It has no impact on sports

Tags

NGSS.MS-PS2-2

What is the main purpose of lubricants in reducing friction?

• To make surfaces rougher

• To make surfaces stickier

• To create a smooth layer between surfaces

• To increase the force of friction

When two surfaces are very smooth, the friction between them is:

• Low

• High

• Constant

• Nonexistent