| What is the Momentum formula? | Momentum [kg m/s] = mass [kg] x velocity [m/s]
P = M x V |
| Is momentum a vector or a scalar? | Momentum is a vector. It has a size and direction |
| What does a resultant force do to an object? Why? | It changes the momentum as because of Newton's Second Law.
Resultant force can cause objects to accelerate [the formula F=ma]
Acceleration can be changed to Change in Velocity
........................................................... -------------------------
.......................................................... Time
This changes the formula for Force making it look like :
Force [N]= Mass [kg] x Change in Velocity [m/s]
.................. -------------------------------------------
..................... Time [s]
This then changes the Momentum formula as Mass x Change in Velocity becomes Change in Momentum
So the equation that links it in is
Force [N] = Change in Momentum [kg m/s]
....................----------------------------------------
................. Time [s] |
| Rearrange it to Time = | Time = Change in Momentum
............. ----------------------------
........... Force |
| So why is something like a car crash lethal? | This is because of the equation. If time gets smaller, the force will get much bigger. Car crashed are very quick which springs a large force on your body resulting injuries |
