What is Friction? PPT Review Lesson

Open Ended

List the FOUR main types of friction we discussed in class and give an example of each from your life experiences.

Multiple Choice

Which type of friction is shown in the picture?

• fluid

• static

• rolling

• sliding

Multiple Choice

What causes friction between two surfaces?

• The smoothness of the surfaces

• The weight of the objects

• The tiny bumps on the surfaces

• The temperature of the surfaces

Multiple Choice

What causes friction?

• Microwelds

• Heat

• Pressure

• Frictionless surfaces

Multiple Choice

Alex and Eric both drop wood blocks with the same masses and shapes from the same heights. Alex has a parachute attached to his block which makes it fall slower. Why does Eric's block fall faster?

• The pull of gravity is greater on Eric's block than on Alex's block.

• There is less air friction on Eric's block.

• The mass of Eric's block is greater.

• The density of Eric's block is different from Alex's block.

Multiple Choice

What is the relationship between the surface area of an object and air resistance?

• The larger the surface area, the less air resistance

• The larger the surface area, the greater the air resistance

• Surface area has no effect on air resistance

• Air resistance is constant regardless of surface area

Multiple Choice

Which diagram shows the forces acting on Peter when he is falling at Terminal Velocity?

• 1

• 2

• 3

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident