# MCAT Physics 2

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1. Gravity definition
A field that exists between any two objects with mass.
2. Field definition
An invisible influence that can exert a force on a mass or charge.
3. Universal Law of Gravitation (force due to gravity)

(In space)

F = mg

(Near earth)
4. Formula for gravity, strength of gravitational field, acceleration due to gravity
5. Gravitational Potential Energy

(In space)

PE = mgh

(Near earth)
6. Friction facts
• Friction opposes sliding not motion.
• If there is sliding, it's kinetic friction; if there's no sliding, it's static friction.
• Static µ is always greater than kinetic µ.
• Surface area does not increase friction when the mass is the same.
7. Force due to friction formula
Ff = µ(s/k)FN

Ff = µ(s/k)mgcos
8. Force down an inclined plane formula
F = mgsin
9. Normal force on an inclined plane formula
FN = mgcos
10. Velocity at the base of an inclined plane
Vf = √(2gh)
11. Hooke's Law
F = k∆x

• x - displacement
• k - spring constant
12. Elastic Potential Energy formula
13. Simple Harmonic Motion formulas
T = 2π√(m/k)

(mass on a spring)

T = 2π√(L/g)

(pendulum)

• T - period (time/wave)
• m - mass
• k - spring constant
• L - length of pendulum
• g - gravity
14. Equililbrium terms
• Terminal velocity
• Constant velocity
• Objects at rest
• Balanced fulcrums or boards on strings
• Objects floating in liquid
15. Torque and lever arms
• T = F
• T = mg
• T = Frsin

• - lever arm
• r - distance between the force and the point of rotation.
• rsin - always equals , but r = only when = 90˚
16. Solving for systems in and not in equilibrium
Equilibrium - list all the forces and put them equal to one another.

Not Equilibrium - list all the forces and add "ma" to the loosing side.
17. Circular motion formula
18. Centripetal vs. Centrifugal
If a string is pulling a ball into a circular motion, the string's force on the ball is centripetal and the ball's force on the string is centrifugal.

Centrifugal does not exist.
19. Angular motion formulas

• v - tangential velocity (m/s)
• f - frequency (Hz)

For the MCAT angular frequency and angular velocity are synonymous.
20. Rotational equilibrium
• An object is in rotational equilibrium if:
• 1. It is NOT rotataing
• 2. It is rotating with a constant angular velocity/frequency
21. Momentum

momentum is inertia increased by velocity and is always conserved (remains constant) in an isolated system.
22. Impulse
• Impulse = ∆
• Impulse = m∆v
• Impulse = Favgt

• If there is no change in velocity, there can be no impulse.
• The greater the change in velocity the greater the change in impulse.
23. Elastic Collisions
• (KE1 + KE2)before + (KE1 + KE2)after
• In elastic collisions momentum and energy are both conserved.
24. Inelastic Collisions
m1v1 + m2v2 = m1v1 + m2v2

In inelastic collisions momentum is conserved but energy is not. For perfectly inelastic collisions the equations becomes:

m1v1 + m2v2 = (m1 + m2)v3
25. Stress
Force/Area
26. Strain
∆dimension/original dimension
27. Modulus of elasticity (ME)
stress/strain

• Young's modulus - simultaneous pushing or pulling, perfectly lined up with one another.
• Shear modulus - simultaneous pushing or pulling not perfectly lined up.
• Bulk modulus - simultaneous compression from all sides.
28. Thermal expansion formula
∆L = Lo∆T

• T - temperature
• L - length in inches
• - coefficient of thermal expansion
29. Internal energy
The energy of internal vibrations of molecules or atoms within a system.
30. Heat energy
Energy dissipated as heat. On the MCAT this usually means heat dissipated from a collision.

Heat energy and internal energy are almost synonymous.
31. Chemical energy
The energy contained within chemical bonds, or the energy stored/released due to the separation and/or flow of electrons.
32. Mechanical energy
ME = KE + PE
33. Work formulas
• W = ∆Energy
• W = Fdcos

Units - Joules () or ()
 Author: Maki6tu ID: 151432 Card Set: MCAT Physics 2 Updated: 2012-08-02 19:33:29 Tags: Physics Folders: Description: Physics Show Answers: