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level: Momentum

Questions and Answers List

level questions: Momentum

QuestionAnswer
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