Forces and Friction

What are the 2 types of forces?

• Contact force

• Normal force

• Non-contact force

• Gravitational force

Types of contact forces

• Push and pull

  force

• Mechanical force

• Magnetic force

• Gravitational force

Types of Non-contact force

• Gravity force

• Electrostatic force

• Push and pull force

• Friction force

What kind of Contact force happens when you brush your hair?

• Electrostatic force

• Gravitational force

• Normal force

• No force

What is friction?

•  the resistance by the surfaces that are in contact when they move past each other.

• It is the gravity.

What are the 2 types of resistance we have in this lesson?

• Air resistance

• Ground resistance

• Water resistance

• Gravity

What are the Advantages of friction?

• Holding

• Walking

• Falling

• None

What are the disadvantages of friction?

• Causes heat

• Push

• Pull

• Slows down speed

Which one of the images describe air resistance?

• 
• 

When we slide in the park on the slider, does it have smooth or rough friction?

• Smooth friction because we go down the slider faster.

• Rough friction because we go down the slider slower.