1. Quantify Forces (the numbers)
And you!

2. Forces = masses X acceleration
Newtons = kg x m/s2

3. Example: What Force is required to accelerate a 0
Example: What Force is required to accelerate a kg object at a rate of 2.1 m/s2 ?
F = m X a
? = kg X m/s2
F = Newtons of force!!!

4. What force do I apply to the floor if I have a mass of 88 kg?
F = m X a
F = kg X m/s2
F = N of force
****** This is my Weight!!!
Notice the difference between. Mass and weight
88 kg N
Mass is a measure of inertia.
Weight depends on the rate of gravitational acceleration!

5. How much force does the egg experience?
Height = 4 m
Mass of egg = 53 grams
Gravitational acceleration (NOT De-acceleration value) = 9.8 m/s2
Time for egg to come to stop (after fall) = 0.02 seconds (2/100ths of a second)
1) Calculate how fast the egg is falling when it lands (Vf)
2) Calculate the rate of de-acceleration
3) Calculate the Force on the falling egg

6. 1). Calculation of Vf of the egg as it falls just prior to impact
Vf2 = VO2 + 2ax VO = 0
Therefore: Vf2 = 2ax.
Therefore: Vf. = (9.8)(4) =
Vf = m/s

7. 2) Calculate the rate of de-acceleration
a = ____V = Vf - Vo = =
time t
De-acceleration rate = m/s2

8. 3) Calculate the Force on the egg
Knowing the mass of the egg and the rate of de-acceleration
F = m x a
F = kg x m/s2 =
F = N of force

9. How many pounds of force is that 23.45 N?
If 1N of force = 0.22 lbs. of force?
23.45 N ( 0.22 lbs.) = lbs of force 1N