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Last modified: January 26, 2018
Impulse Force
---------------
The impulse force, is defined as the rate of change of momentum. It is commonly
used to calculate forces in collisions.
Faverage = ma = mΔv/Δt
So
Impulse = FaverageΔt = mΔv
Extending the time of a collision can be used to reduce the impact force.
Alternatively, the same effect can be send by extending the distance of a
collision. This can be seen from the energy formula.
Fd = -(1/2)mv2
Example 1.
A golfer strikes a .2 kg golf ball. The club is in contact with the ball for .3 s and
has a final velocity of 30 m/s. What is the force applied to the ball by the
golf club? What is its acceleration?
F = 0.2 * (30 - 0)/.3 = 20 N
a = F/m = 20/.2 = 100 m/s2