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1

Contact forces

Whenever two bodies interact by direct contact (touching) of their surfaces, we describe the interaction in terms of contact forces

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2

Friction force

The component vector parallel to the surface is the friction force.

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3

Kinetic friction force

The kind of friction that acts when a body slides over a surface is called a kinetic friction force.

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4

Static friction

When a body is not moving relative to a surface, the friction force is called static friction.

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5

What is the direction of the fluid resistance force acting on a body

The direction of the fluid resistance force acting on a body is always opposite the direction of the body’s velocity relative to the fluid.

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6

Fluid resistance force for a small object at low speed

The magnitude f of the fluid resistance force is approximately proportional to the body’s speed v

f=kv

where k is a proportionality constant that depends on the shape and size of the body and the properties of the fluid.

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