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31 Cards in this Set

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  • Back
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What is average speed and instantaneous speed?

1. Rate of change of distance


2.rate at which distance is changing

Dist

What is average and instantaneous velocity?

1.rate of change of displacement.


2.rate at which displacement is changing.

Not dist

What is average acceleration and instantaneous acceleration?

1. Rate of change of velocity.


2.rate at which velocity is changing.

Not dist or displacement

(Equations of motion)


When x is missing ?

V=u+at

V is the subject

(Equations of motion)


Without u?

X=vt-1/2at^2

1/2

(Equations of motion)


Without v?

X=ut+1/2at^2

1/2

(Equations of motion)


Without a?

X=1/2(u+v)t

t is last

(Equations of motion)


Without t?

V^2=u^2+2ax

V^2 is the subject

Equation for linear momentum

P=mass x velocity

Ni (Newton’s first law)?

An object continues moving at a constant speed in a straight line, or remains at rest, unless acted upon by a resultant force.

Objects stay as they are

Nii (Newton’s second law)

The rate of change of an objects momentum is proportional to the resultant force acting on it.

Proportion

Niii (Newton’s third law)

If a exerts a force on b then be will exert an equal but opposite force on a.

a<->b

Conservation of momentum

The vector sum of momentum in a system stays constant provided there is no external resultant forces acting on that system.

M1u1+m2u2=m1v1+m2v2

Name the four types of collision

Elastic collisions


Inelastic collisions


Perfectly inelastic collisions


Explosive collisions

What is the symbol for momentum?

P

Equations for force?

F=ma


Sum of F= p-weight

Add more

What is conserved in elastic collisions

Momentum and kinetic energy

What is conserved in elastic collisions

Momentum and kinetic energy

What is conserved in inelastic collisions

Momentum Ke is converted to other forms

What is conserved in elastic collisions

Momentum and kinetic energy

What is conserved in inelastic collisions

Momentum Ke is converted to other forms

How does momentum act in explosive collisions?

There is no momentum before the collision and no momentum after the collision

Equation for kinetic energy?

1/2mv^2

Equation for gravitational potential energy?

Pe=mgh

Equations for power?

Power= work done over time


Power = (force x distance) over time


Power =force x velocity

Equation for work done?

Wd = force x distance

To find spring constant?

Mass x gravity= k x extension

Clues for when a strong nuclear force is involved In a reaction?

Involves on hadrons/ quark make ups


Reaction has a very short lifetime, less than a second.

Clues for when a reaction involves a weak nuclear force?

Neutrinos involved?


Change in quark flavour?


Long lifetime (longer than a second)

Clues for when a reaction involves a weak nuclear force?

Neutrinos involved?


Change in quark flavour?


Long lifetime (longer than a second)

Clues for a reaction with EM force?

Do all particles have charge?


Including any photons? (Gamma radiation)