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Physics 1 - Motion, Forces And Conservation Of Energy > Changes In Momentum > Flashcards

Flashcards in Changes In Momentum Deck (10)
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1

what happens when a resultant force acts on an object for certain amount of time

it causes a change in momentum

2

what equation from newton displays how a resultant force on an object causes it to accelerate

force = mass x acceleration

3

what equation using force shows that acceleration is just a change in velocity over a certain period of time

- force = mass x change in velocity / time
- f = m(v - u) /t

4

why does the mass x change in velocity equal a change in momentum

- because a force applied to an object over any time interval will change the objects velocity
- whether that through be changing the direction of the object
- or changing its 'speed' through acceleration or deceleration

5

what is the equation which shows that mass x change in velocity equals the change in momentum

- force = change in momentum / time
- F = (mv - mu) / t

6

what are units for force, change in momentum and time

- force = N
- change in momentum = kg m/s
- time = s

7

using the equation for change in momentum, what does a faster change in momentum directly imply

- that the force causing the change must be bigger
- as when t gets smaller (time)
- the force calculated will be bigger

8

why is it more dangerous for a car crash to happen with cars going at faster speeds than at slower speeds

- at faster speeds, the change in momentum from the cars crashing and the forces acting in opposite direction is much larger
- considering the cars stop instantly when they crash
- leading to a much larger force acting on the bodies of the car when using the change in momentum equation

9

how can you relate the cars crashing at higher and slower speeds to the equation for acceleration

- when the fast cars with a higher velocity crash, the change in velocity would be much larger
- for a given time for the fast and slow cars
- meaning the acceleration (or accurately deceleration) is much higher
- and because of f - ma, a larger force is needed to produce a larger acceleration
- so acceleration and change in momentum are pretty much proportional

10

what kind of relationship do the equations for acceleration and change in momentum have and what equation ties them together

- they have a proportional relationship
- which is explained through f = ma
- showing that a lager acceleration, caused by a larger change in velocities, leads to a higher force produced
- and the change in momentum equation shows that a larger difference in momentum, highly determined by velocity, will also lead to a higher produced force