Exam1Review Sheet - exam 1 review PDF

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Physics 6A Exam 1 Review Sheet

Peter Heuer, October 29th, 2014

Math - Sine and Cosine of 0, 30, 45, and 90 degrees (memorize the first quadrant of the unit circle!). - How to add vectors by breaking them into components.

Units - Dimensional analysis (plugging just units into an equation to make sure they cancel to give you the correct units in the answer). - Unit conversions (see list of some useful conversion factors to know).

Kinematics - Average vs. instantaneous quantities. - Definitions of displacement, speed, velocity, and acceleration. - Equations of motion for constant acceleration. - Projectile motion.

General Forces - Newton’s three laws: 1. An object in motion stays in motion unless acted on by an external force: a = 0 if F = 0. P 2. F = ma 3. Every action has an equal and opposite reaction: F12 = −F21 . - Free body diagrams. - Tension. Remember that, in a mass-less rope, the tension is equal everywhere in the rope, including at both ends.

Friction and the Normal Force - How to find normal forces using

P

F = ma.

- The difference between static and kinetic friction, and the constants µs and µk . In general, µk < µs . - FF = µFN

Circular Motion - In order to move in a circle, an object must experience a force, called the centripetal force, inward towards the center of the circle. - If this force suddenly stops acting, the object will immediately begin moving in a straight line.

Physics 6A Exam 1 Review Sheet

Peter Heuer, October 29th, 2014

Kinematics

Math

~v =

∆~x ∆t

~a =

∆~v ∆t

1 x = x0 + v0 t + at2 2 v2 = v0 2 = 2a(x − x0 )

Opposite Hypotenuse Adj acent Cosine = Hypotenuse Opposite T angent = Adj acent Sine =

General Forces X

F = ma

F12 = −F21

Units Fgravity = mg Conversion Factors - 1 inch = 2.54 cm - 1 m ≈ 3.25 feet

Friction and the Normal Force

- 1 mile ≈ 1.6 km - 1 kg ≈ 2.2 lbs

Ff riction = µFN

Metric Prefixes - 10−9 =⇒ nano (n) - 10−6 =⇒ micro (µ) - 10−3 =⇒ milli (m)

Circular Motion

- 10−2 =⇒ centi (c) - 103 =⇒ kilo (k)

Fcentripital =

mv2 r...