Force & Motion 2Force & Motion 2

Friction

• Friction is a force that opposes the motion of objects that touch as they move past each other

There are 4 main types of friction each with there own set of Characteristics

Types of Friction 1

• Static Friction• The friction force that

acts on objects that are not moving

Types of Friction 2

• Sliding Friction• A force that opposes

the direction of motion of an object as it slides over a surface

Types of Friction 3

• Rolling Friction• The friction force that acts on rolling objects

Types of Friction 4

• Fluid Friction• Friction force that opposes the motion of objects

through fluids such as water, air, and liquids

Gravity

• Gravity is a force that acts between two masses

• Earths gravity acts downward

Falling objects

• Gravity causes objects to accelerate downward, whereas air resistance acts in the direction to the motion and reduces acceleration