Friction Introduction

What is friction?

• Friction is the force that causes motion.

• Friction is the force that accelerates motion.

• Friction is the force that opposes motion.

• Friction is the force that supports motion.

What are the different types of friction?

• dynamic friction, rolling friction, viscous friction, and internal friction

• static friction, sliding friction, rolling friction, and fluid friction

• kinetic friction, magnetic friction, air friction, and surface friction

• tension friction, gravitational friction, electrical friction, and thermal friction

Which type of friction occurs when an object is at rest?

• kinetic friction

• rolling friction

• fluid friction

• static friction

Which type of friction occurs when an object is in motion?

• fluid friction

• static friction

• kinetic friction

• rolling friction

What factors affect the amount of friction between two surfaces?

• Temperature of the surfaces, color of the surfaces, size of the surfaces

• Type of music playing nearby, time of day, distance between the surfaces

• Number of people watching, smell of the surfaces, taste of the surfaces

• Nature of surfaces, force pressing surfaces together, presence of lubricants

What is the formula to calculate kinetic friction?

• Fk = μk * m

• Fk = μk * Fg

• Fk = μk * N

• Fk = μs * N

What are some examples of kinetic friction in everyday life?

• sliding a book on a table, rubbing your hands together, driving a car on the road

• pushing a shopping cart, walking on a carpet, riding a bike on a pavement

How does friction affect the motion of objects?

• Friction increases the speed of objects

• Friction opposes motion

• Friction has no effect on the motion of objects

• Friction causes objects to move in a straight line

What are the units of friction?

• Meters per second (m/s)

• Newtons (N)

• Kilograms (kg)

• Joules (J)

How can friction be reduced?

• Increasing the weight of the object

• Applying more force

• Using rough surfaces

• Using lubricants or smooth surfaces