Momentum driver
Calculate the change of momentum for each driver.
Imagine they both weigh 80 kg. One is in a car weighing 1500kg going at 10 m/s, the other in a 500kg car going towards the other one at 30 m/s
Imagine they both weigh 80 kg. One is in a car weighing 1500kg going at 10 m/s, the other in a 500kg car going towards the other one at 30 m/s
Reply 1
Original post
by GeriaticStudentCalculate the change of momentum for each driver.
Imagine they both weigh 80 kg. One is in a car weighing 1500kg going at 10 m/s, the other in a 500kg car going towards the other one at 30 m/s
Imagine they both weigh 80 kg. One is in a car weighing 1500kg going at 10 m/s, the other in a 500kg car going towards the other one at 30 m/s
What have you done?
Reply 2
Original post
by GeriaticStudentCalculate the change of momentum for each driver.
Imagine they both weigh 80 kg. One is in a car weighing 1500kg going at 10 m/s, the other in a 500kg car going towards the other one at 30 m/s
Imagine they both weigh 80 kg. One is in a car weighing 1500kg going at 10 m/s, the other in a 500kg car going towards the other one at 30 m/s
You have a problem with momentum changes for some drivers. Here is a quick way to think about it:
a) Firstly, consider each car and driver an independent unit until something happens. There is no mention of crashes in the problem, so think of them separately.
b) Brief reminder about momentum - it is based on how heavy something is and how fast it is going. The formula is momentum (p) = mass (m) x velocity (v). Keep in mind that velocity has a direction, so if one car is moving left, and the other car is moving right, you will need to distinguish the directions with positive and negative signs.
c) To find the total weight for of each unit, just add the weight of each driver (80 kg) to each unit of weight.
d) Next, find the momentum at start using p = mv. Take care to apply negative or positive signs as required depending upon the direction.
e) Change in momentum (Δp) = Final momentum (pf) - Initial momentum (pi), and since you do not have final speeds, you would just calculate initial momentum, and can think of change as momentum compared to a still position.
And do not forget the units! Momentum = kgms^-1. You can do it!
Here is my 2 cents!
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