Physics Flashcards - Work, Energy, Momentum

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What is the formula for work? W =

W = (Force)(distance)cosθ = Fdcosθ
What is the unit of work?

The unit of work is the Joule (N*m).
What is the formula for power? P =

P = =
What is the unit of power?

The unit of power is the Watt (1 joule/sec).
What is the formula for kinetic energy? KE =

KE = =
What are the units of KE?

The units of KE are joules.
What is the formula for gravitational potential energy? U =

U = (mass)(gravity)(height) = mgh
What are the units of gravitational potential energy?

The units of GPE are joules.
(T/F) The total mechanical energy of a body is the sum of its kinetic and potential energies.

True.
Is total mechanical energy a constant if the only forces that act on a body are conservative (E = K + U = constant)?

Yes, E = K + U = constant
What is the change in energy of a system if only conservative forces act upon it?

If only conservative forces act on a body, then ΔE = 0.
What is the formula for momentum? p =

p = (mass)(velocity) = mv
What is the formula for impulse J? J =

J = (Force)(time) = Ft = mv-mv₀= Δp
Is kinetic energy conserved in a completely elastic collision?

Yes, kinetic energy is conserved in a completely elastic collision.
(T/F) Net external force must equal zero for conservation of momentum to occur.

True.
What is the formula for the center of mass for two masses, m₁ and m₂, lying along the x-axis at points x₁ and x₂? X =

X =
(T/F) Momentum is not conserved in an inelastic collision.

False, momentum is conserved in both elastic and inelastic collisions.

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awc1990

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Card Set

Physics Flashcards - Work, Energy, Momentum

Description

Physics Flashcards - Work, Energy, Momentum Kaplan MCAT P16-P20

Updated

2013-04-09T07:30:21Z