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Physics > Mechanics > Flashcards

Mechanics Flashcards

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1
Q

What is the equation for newtons second law?

A

F=m*a

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2
Q

Unit of force?

A

N= kg*m/s^2

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3
Q

What is the force of gravity used for?

A

Calculate weight

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4
Q

Force of gravity equation

A

Fg=m*g
Acceleration due to gravity

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5
Q

Unit of mass

A

Kg

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6
Q

What is specific gravity/relative density?

A

Comparing density of substances

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7
Q

Formula for specific gravity/realative density

A

RD=p substance/p water
P= density

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8
Q

Formula for density

A

P= m/v

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9
Q

Must common units for density?

A

Kg/L or g/ml

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10
Q

What is the density of water?

A

1000kg/m^3

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11
Q

What does relative density tell us about how much of the object will be under water when placed in water?

A

Rd = % of object submerged in water

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12
Q

How much of the object is submerged when rd > 1?

A

100%

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13
Q

What is work?

A

W =F* d

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14
Q

What is the unit of work?

A

Nm = J

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15
Q

What is the formula for gravitational potential energy?

A

U=mgh

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16
Q

What is the unit of gravitational potential energy?

A

J

17
Q

Formula for kinetic energy?

A

Ek=1/2•m•v^2

18
Q

Unit of kinetic energy

A

J

19
Q

U Max =?

A

U Max = Ke Max

20
Q

When is gravitational potential energy at its max?

A

At Max height

21
Q

When is kinetic energy at its Max?

A

Right before the object hits the ground

22
Q

When kinetic energy is at its max, what is the gravitational potential energy?

A

At its lowest

23
Q

Equation for momentum

A

p=m•v

24
Q

F•🔺t=?

A

m•🔺v
Change in momentum

25
Q

Impulse=?

A

F•🔺t

26
Q

Conservation of momentum formula

A

p1+p2=p1’+p2’
Energy is conserved

27
Q

What is elastic collision?

A

Collision with no change in kinetic energy

28
Q

What is an inelastic collision?

A

Collision where there is a change in kinetic energy, it is not conserved

29
Q

Formula for perfectly elastic collisions?

A

V1+V1’=V2+V2’

Physics (8 decks)

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