Force and Free Body Diagrams

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Force: Mass (kg) x acceleration ($m{s}^{-2}$), units in Newtons (N)

• Vector Quantity, include direction

$f=ma$

• We can use this for free body diagrams
• If one arrow is bigger, it is accelerating in that direction
• You can write the force as “$F_x$”, where x is the type, e.g. gravity
• Thus, an object travelling at a constant velocity has no force, and all arrows are equal
  • It has momentum
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$F_{weight}=mg$ $F_{weight}=F_{normal}$