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Physics > Momentum U4 > Flashcards

Momentum U4 Flashcards

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0
Q

What are the conditions for an elastic collision

A

The kinetic energy of the collision is conserved

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1
Q

P=

A

Mv

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2
Q

Kinetic energy =

A

P^2/2m

1/2mv^2

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3
Q

What is the de broglie wavelength? What is the equation?

A

The de Broglie wavelength shows that an electron can have the properties of a wave as well as a particle at high speeds
Wavelength=h/p

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4
Q

Define an electronvolt

A

It is the energy gained by an electron across a potential difference of 1v

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5
Q

What is 1eV equal to

A

1.6x10^-19

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6
Q

What is the experiment to find rate of change of momentum (what is a key apparatus of this experiment)

A

The mass pulling a trolley over time using a motion censor

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7
Q

Change in momentum =

A

Force x time

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8
Q

What does the graph of momentum against time look like

A

It is directly proportional

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9
Q

What is the gradient equal to as the line on a momentum/time graph

A

Acceleration

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10
Q

Is momentum conserved? If so, when?

A

YES ALWAYS

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11
Q

What is an experiment to prove the conservation of momentum

A

The two trolleys colliding and having pieces of card ontop of each one cutting through light gates

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12
Q

Total momentum before =

A

Total momentum after

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13
Q

For rate of change of momentum what measurements do you take

A

Record the movement of the trolley over time as a force makes it move from rest, using a motion censor. This means you can find the velocity/second and consequently the momentum/second (because mass is known). Find the force by mg=F as a known mass is used to pull the trolley.

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14
Q

What must be kept constant for the rate of change of momentum experiment?

A

The force pulling the trolley so, the mass

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15
Q

What can you do to find a distance if it is at an angle (angle is known)

A

Resolve / use Pythagoras

16
Q

What do you assume when considering conservation of momentum

A

There are no external forces acting

17
Q

How would you find the masses of a neutron and a He nucleus colliding

A

The mass of a neutron would be taken as 1 and a helium nucleus has 4 neutrons so the helium would be taken as having mass of 4

18
Q

Newton’s second law is

A

F=ma

19
Q

Ek=

A

1/2mv^2

P^2/2m

20
Q

What is the rate of change In momentum directly proportional to

A

Resultant force acting on an object

21
Q

Is kinetic energy always conserved

A

No

22
Q

If kinetic energy isn’t conserved why is this in a collision?

A

Because some of the energy in the collision will be transferred to sound or thermal energy

Physics (20 decks)

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