# Forces, Forces Everywhere - PowerPoint PPT Presentation

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Forces, Forces Everywhere. An investigation of frictional forces around us. Forces. Newton’s 2 nd law: F=m*a Weight is an example of Force Gravity is an example of Acceleration Forces can be described by the direction in which the acceleration acts Forces acting on surfaces Normal Force.

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Forces, Forces Everywhere

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## Forces, Forces Everywhere

An investigation of frictional forces around us

### Forces

• Newton’s 2nd law: F=m*a

• Weight is an example of Force

• Gravity is an example of Acceleration

• Forces can be described by the direction in which the acceleration acts

• Forces acting on surfaces

• Normal Force

### “Nonconservative” Forces

• Friction

• Proportional to the normal force

• Exists for motionless and moving objects.

• Ff=μN

• Drag

• Proportional to velocity of fluid or object

• Fd=(½)ρv2CdA

• Density, velocity, drag coefficient, area

### Purpose

• We will experiment with friction by examining the force needed to move two surfaces past each other, and analyze the force-position data to calculate frictional coefficient(s).