Chad's Flashcards by Mara T

Q

What is the equation for Vx?

A

Vcos(Θ)

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Q

What is the equation for Vy?

A

Vsin(Θ)

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Q

∆x =

A

v*t

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Q

∆x = vit +

A

1/2at^2

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Q

vf^2 =

A

vi^2 + 2a∆x

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Q

vf =

A

vi + at

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Q

Normal force is proportional to

A

Friction

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Q

In dynamic equilibrium, what is constant?

A

Velocity

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Q

What is equation of friction?

A

µ*N

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Q

What is the equation of Conservation of Mechanical Energy?

A

PEi + KEi = PEf + KEf

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Q

What is the equation of PE?

A

PE = mgh

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Q

What is the equation of KE?

A

KE = 1/2mv^2

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Q

Power is expressed in what unit?

A

Watts

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Q

What is the equation of Power?

A

Work / ∆t

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Q

What is the equation of Momentum?

A

P = m * v

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Q

What is the equation of Impulse?

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A

∆p = F * ∆t

Q

In any calculation, what happens to momentum?

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A

It is conserved

Q

Momentum and KE are conserved in an

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A

Elastic collision

Q

What is conserved in an Inelastic collision?

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A

Only momentum

Q

How is the KE force in an Inelastic collision?

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A

Always smaller

Q

How many radians is 360˚?

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A

2π radians

Q

How many radians is 180˚?

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A

π radians

Q

How many radians is 90˚?

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A

π/2 radians

Q

What is angular velocity?

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A

∆Θ/∆t

What is angular acceleration?

∆w/∆t

What is distance in terms of a circle?

r * ∆Θ

What is velocity in terms of a circle?

r * w

What is acceleration in terms of a circle?

r * acceleration (alpha)

What is Force in terms of two planets etc

F = Gm1m2 / r^2

Uniform circular motion has constant

Velocity

Uniform circular motion does not have constant

Acceleration

Impulse is used to

Change momentum

Perfectly inelastic collisions always

Lose energy

When 2 objects are stuck together, what kind of collision is that?

Perfectly inelastic

KE is not conserved in which collisions?

- Inelastic | - Perfectly Inelastic

How many radians is 360˚?

2π

How does centripetal acceleration influence the tangent velocity?

It changes its direction