Difference between revisions of "Impact Force"
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<math>\frac{F}{m} = \frac{\Delta v}{t}</math> | <math>\frac{F}{m} = \frac{\Delta v}{t}</math> | ||
| − | <math>F = \frac{m \ | + | <math>F = \frac{m \Delta v}{t}</math> |
Where: | Where: | ||
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<math>F </math> = The impact [[force]]. | <math>F </math> = The impact [[force]]. | ||
| − | <math>m \ | + | <math>m \Delta v</math> = The change in [[momentum]]. |
<math>t</math> = The time taken for the [[momentum]] to change. | <math>t</math> = The time taken for the [[momentum]] to change. | ||
Revision as of 16:00, 16 February 2019
Key Stage 4 Higher
Meaning
An impact force is the force involved in the collision between two objects.
About Impact Forces
- Impact forces are proportional to the change in momentum during a collision and inversely proportional to the time taken for the collision.
- Impact forces explain the reason crashing at high speed is so dangerous and why cars have crumple zones and air bags. They both increase the time taken for the passengers to change momentum which reduces the force experienced by them.
Equation
NB: You do not need to remember the equation but you do need to be able to use it. Combining the two equations\[a = \frac{F}{m}\]
and
\(a = \frac{\Delta v}{t}\)
Gives
\(\frac{F}{m} = \frac{\Delta v}{t}\)
\(F = \frac{m \Delta v}{t}\)
Where\[F \] = The impact force.
\(m \Delta v\) = The change in momentum.
\(t\) = The time taken for the momentum to change.