7th T1L4 Friction and Factors Affecting It

What is the force called that two surfaces exert on each other when they rub against each other?

• Gravity

• Friction

• Magnetism

• Inertia

Which direction does friction act in?

• Same direction as the object's motion

• Opposite direction of the object's motion

• Perpendicular to the object's motion

• Random direction

What factors affect the friction between two surfaces?

• Temperature and pressure

• Color and shape

• Types of surfaces and pressure

• Weight and size

Which type of surface produces less friction?

• Rough surface

• Smooth surface

• Wet surface

• Hard surface

What happens to friction when surfaces push harder against each other?

• Friction decreases

• Friction increases

• Friction remains the same

• Friction becomes random

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 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 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