5.2 Friction

5.2 Friction

"The force that always opposes motion"

Activity 1

Wait, what is friction again? 😄

Multiple Choice

Friction is a force that may slow down an object 😑

• True

• False

Multiple Choice

Force of friction is always perpendicular to the _____

• Friction Force

• Normal Force

• Mango Force

• Applied Force

Multiple Select

What are the factors that friction depends on? [Tick all the correct answers]! 😎

• Weight

• Magnesium

• Vitamins

• Type of surface

Multiple Choice

Okaaay. Can you tell me when is friction more? 😜

• On rough surfaces! 🌵

• On smooth surfaces 🍦

Good good. Basics are covered.

Do not exit quizzes. We will be back!

Activity 2

2 Types of Friction 😏

Multiple Select

What are the two types of friction? [Tick all the correct answers]!

• Kinetic Friction

• Static Friction

• Gluten Friction

• Quinoa Friction

Multiple Choice

____________is the force exerted on one surface by another when they are rubbed and one of the surfaces or both are moving.

• Kinetic Friction

• Static Friction

Multiple Choice

____________ is the force exerted on one surface by another when there is no motion.

• Kinetic Friction

• Static Friction

Multiple Choice

Frictional force (F_f) is ____________ to normal force (F_N).

• Perpendicular

• Parallel

Multiple Choice

Examine the graph and mention which surface has the maximum coefficient of kinetic friction?

• Sandpaper

• Rough table

• Highly polished table

Multiple Choice

Equation for coefficient of kinetic friction can be given as:

________________

Multiple Choice

Equation for coefficient of static friction can be given as:

________________

Multiple Choice

The SI unit of coefficient of kinetic and static friction is ________

• No unit!

• Newtons

Alrighhht, now we are ready to problem solve

Do not exit quizzes. We will be back!

Activity 3

Problem Solving

Multiple Choice

You need to move a 105 kg sofa to a different location in the room. It takes a force of 102 N to start it moving. What is the coefficient of static friction between the sofa and the carpet? 😊

• 0.0991

• 1.98

Activity 4

Problem Solving Part 2

Multiple Choice

A girl exerts a 36 N horizontal force as she pulls a 52 N sled across a cement sidewalk at constant speed. What is the coefficient of kinetic friction between the sidewalk and the metal sled runners? Ignore air resistance. 😝

• 0.69

• 60

• 70

• 0.01

Activity 5

Analyzing ways to reduce friction? 😉

Open Ended

Friction is giving this guy a hard time 😕 What do you think would help him move this box easier?

Open Ended

Any questions?