Chapter 5: Applying Newton's Laws
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6 Terms
1
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Contact forces
Whenever two bodies interact by direct contact (touching) of their surfaces, we describe the interaction in terms of contact forces
2
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Friction force
The component vector parallel to the surface is the friction force.
3
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Kinetic friction force
The kind of friction that acts when a body slides over a surface is called a kinetic friction force.
4
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Static friction
When a body is not moving relative to a surface, the friction force is called static friction.
5
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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.
6
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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.
f=kv
where k is a proportionality constant that depends on the shape and size of the body and the properties of the fluid.
Note 
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