Types of Friction

What happens to the object when the forces are not balanced? 

• Accelerates
• Stays
• Nothing
• None of the above

How do we measure forces?

• Feet
• Newtons
• Inches
• kg

What is Sliding Friction?

• Opposes submarines in the water and airplanes in the air
• Opposes the dirrection of an 0bject as it slides over a surface
• None of the above
• Change in shape the point of rolling contrast because of friction

How many types of frictions are there?

• 2
• 4
• 10
• 6

You jump out of a plane with a parachute. What is the force that brings you to the ground?

• Inertia
• Gravity
• Sliding Friction
• Rolling friction

Define Fluid Friction

• Friction that occurs when a solid pushes a liquid or a gas aside
• The friction of stationary objects. You must use more force to move an object experiencing this kind of friction
• Friction that occurs when a solid rolls across a surface
• Friction caused by two objects sliding against each other

Define Rolling Friction

• Friction caused by two objects sliding against each other
• Friction that occurs when a solid rolls across a surface
• Friction that occurs when a solid pushes a liquid aside
• The friction of stationary objects. You must use more force to move an object experiencing this kind of friction

Define Static Friction

• Friction caused by two objects sliding against each other
• Friction that occurs when a solid rolls across a surface
• The friction of stationary objects. You must use more force to move an object experiencing this kind of friction
• Friction that occurs when a solid pushes a liquid aside

Frictions acts in the direction _____to the direction of the object's motion.

• Perpendicular
• Parallel
• Opposite
• Diagonal

A football player is pushing a heavy sled for workouts. What type of friction must he overcome in order to start the sled?

• Rolling Friction
• Static Friction
• Fluid Friction
• Sliding Friction?