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### PHSYICS

Is a branch of science that deals with the properties, behavior and interaction between matter and energy

Subdivisions of Physics behavior and interaction between matter and energy

- Classical Mechanics: study of motions based on Newton’s laws of mechanics
- Thermodynamics & Statistical Mechanics: study of energy conversion involving heat and other forms of energy
- Electromagnetism: interaction of electricity and magnetism, affecting presence/motion of particles
- Relativity: relationship of electromagnetism and mechanics
- Quantum Mechanics: atomic and subatomic systems and their interaction w/ radiation

Measurements behavior and interaction between matter and energyHow far? How large? How much?

BASIC QUANTITIES

Length: locates position of a point in space

Time: succession of events

Mass: amount of matter in a body

DERIVED QUANTITIES behavior and interaction between matter and energy

- Volume: amount of space an object takes up

EXAMPLE:

What is the volume of a cylinder which has a diameter of 6 cm and a height of 5 cm?

Formula: V = ∏r2h

Answer: 45 ∏ cm3

- Density behavior and interaction between matter and energy: mass of an object per unit volume
EXAMPLE

What is the density of a 40 ft x 25 ft x 10 ft rectangular prism if it has a mass of 50000 grams?

D = mass/volume

Answer: 5 g/ft3

UNITS OF MEASUREMENT behavior and interaction between matter and energy

Conversion of Units behavior and interaction between matter and energy

How many behavior and interaction between matter and energymililiters are there in 3.45 L?

Answer: 3450 ml

Try these:

20 seconds = ? hours

10 m/s = ? km/h

10 cm3 = ? m3

SIGNIFICANT DIGITS behavior and interaction between matter and energy

- Nonzero digits are always significant.
- All final zeroes after decimal points are significant.
- Zeroes between two other significant digits are always significant.
- Zeroes used solely for spacing decimal points are not significant.

SCALARS behavior and interaction between matter and energyQuantities described by magnitude alone.

i.e. Length, mass, time, speed, energy, temperature, etc.

VECTORSQuantities described by both magnitude and direction.

i.e. Position, force, displacement, velocity, acceleration, torque, momentum ,etc.

Sense and Direction behavior and interaction between matter and energyof vectors can be represented in two ways.

A. Four primary directions

Sense and Direction behavior and interaction between matter and energyof vectors can be represented in two ways.

B. Cartesian Plane

MECHANICS behavior and interaction between matter and energyBRANCH OF PHYSICS CONCERNING THE MOTIONS OF OBJECTS AND THEIR RESPONSE TO FORCES.

- DISTANCE: scalar; how much ground an object can cover during its motion
- DISPLACEMENT: vector; how far out of place an object is
Displacement = final position – initial position

- SPEED: scalar; behavior and interaction between matter and energyhow fast an object is moving
- VELOCITY: vector; rate at which an object changes its position
Average speed = distance travelled/elapsed time

(s=d/t)

Average velocity = ∆ in position/elapsed time

(v=∆d/ ∆t)

- Acceleration: vector; behavior and interaction between matter and energychange in velocity over a time interval
- Positive direction of motion: acceleration
- Negative direction: deceleration
A = (final velocity – initial velocity)/ elapsed time

A = ∆V/ ∆T

What is the average speed of a car that travels 330 km in 11 hours?

s = d/t = 330 km/11hrs = 30 km/hr

A cart accelerates from 88 m/s to 121 m/s in 11 s. What is its acceleration?

A = ∆v/ ∆t = (121-88)/11 = 3 m/s2

Uniformly Accelerated Motion hours?(UAM)

- Vf = Vi + at
- D = Vit + 1/2at2
- Vf2 = Vi2 + 2ad

An automobile is moving at hours?5 m/s and accelerates at 0.5 m/s2.

What is the velocity after 20 s? What is the distance travelled by the car?

- FREE FALL – uniformly accelerated motion under the sole influence of gravity.
A = 9.8 m/s2 downward

Downward gravitational acceleration is indicatedby making acceleration negative.

NEWTON’S LAWS OF MOTION influence of gravity.

- Law of Inertia
- an object at rest will stay at rest, and an object in motion will stay in motion, unless it is compelled to change that state by external forces.
Inertia: property of matter that resists changes in motion

Mechanical Equilibrium: achieved when sum of all forces acting upon an object is zero.

- Law of Acceleration influence of gravity.
- The acceleration of an object is directly proportional to the net force acting upon it and inversely proportional to its mass
A = force / mass

Force: push or pull done on an object that changes its state of motion

- Law of Interaction influence of gravity.
- Every action elicits an equal and opposite reaction
FREE BODY DIAGRAMS

SHOW RELATIVE MAGNITUDE AND DIRECTION OF ALL FORCES ACTING UPON AN OBJECT IN A GIVEN SITUATION.

SPECIAL TOPICS influence of gravity.

- Projectile motion: motion in two dimensions
Horizontal (x-axis) component of motion

X = Vicosθt

Vertical (y-axis) component of motion

Y = Visinθt + 1/2gt2

- Uniform Circular Motion influence of gravity.: motion in a circular path
- velocity changes in direction yet the magnitude remains constant, thus motion is accelerate

- direction of acceleration is inward due to centripetal force

- Torque influence of gravity.: tendency of a force to rotate an object about some axis
Torque = FI

*where F = force applied perpendicularly; I = distance of applied force from fulcrum/axis

Linear Momentum and Collisions

P = mass x velocity = mv

*where P = momentum

ENERGY influence of gravity.

- Law of conservation of energy
- Energy can neither be created nor destroyed.
MECHANICAL ENERGY: energy possessed by a body due to its position (Potential energy) or motion (Kinetic energy)

ME = PE + KE

ENERGY influence of gravity.

- Potential Energy (PE) – energy possessed by a body due to its position, shape, and configuration
PE = mgh

- Kinetic Energy (KE) – energy of motion
KE = 1/2mv2

Work and Power influence of gravity.

Work = Force x Distance

Power = Work / Time

*unit for power is the Joule/second or simply watt.

WAVES influence of gravity.

- A disturbance that travels through a medium, transporting energy to another location without transporting matter
- Transverse: particles move perpendicular to the direction of the wave
- Longitudinal: particles move parallel to direction of the wave
- Surface: particles undergo a circular motion

WAVE PROPERTIES influence of gravity.

ELECTRICITY influence of gravity.

Ohm’s Law

V = IR

I – Current; unit: ampere (A)

V – Voltage; unit: volt (V)

R – Resistance; unit: ohm (Ω)

ELECTRIC CIRCUITS influence of gravity.

- Series: current is constant; voltage adds up

- Parallel influence of gravity.: current adds up; voltage is constant

OPTICS influence of gravity.

- Reflection: change in direction of a light ray in an interface with dissimilar media so that the wave returns into the medium from which it originated
Law of Reflection

Angle of incidence = Angle of reflection

- Refraction influence of gravity.: change in direction of a wave due to a change in its speed when passing through a different medium
Law of Refraction

n1sinθ1 = n2sinθ2

PLANE MIRROS influence of gravity.

Image characteristics: virtual, upright, same distance from the mirror as the object’s distance, same size as the object

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