2.1 
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Interactive Simulations   Position and displacement in one dimension    Displacement and position in two dimensions    Solve v=dx/dt for dt    Velocity, position, and time (basic version)    Velocity, position, and time (more advanced version)    Acceleration (basic version)    Acceleration (more advanced version)    Static equilibrium    Static equilibrium and the lever    Newton's second law (basic version)    Newton's second law (more advanced version)    Circular motion interactive simulation    Orbits of the planets and dwarf planets    Orbits simulation Interactive Calculators   Speed calculator    Velocity calculator    Acceleration calculator    Velocity in accelerated motion    Average velocity calculator    Hooke's law calculator    Torque calculator    Rotational equilibrium and torque    Newton's second law calculator    Momentum calculator    Angular velocity    Linear velocity and angular velocity    Centripetal acceleration    Centripetal force    Law of universal gravitation calculator
1 - Science of Physics
2 - Forces and Motion      Chapter 2 at a glance      2.1 - Motion      2.2 - Force, momentum, and Newton's laws      2.3 - Circular motion      2.4 - Solving harder physics problems      2.5 - Chapter review3 - Energy Transformations4 - Waves and Sound
5 - Electricity and Magnetism
6 - Light and Optics
7 - The Atom
8 - Linear Motion
9 - Vectors and Forces
10 - Forces
11 - Newton's Laws and Gravitation
12 - Circular Motion and Gravitation
13 - Torque and Static Equilibrium
14 - Momentum and Collisions
15 - Angular momentum
16 - Power and Machines
17 - Harmonic Motion
18 - Waves
19 - Sound
20 - Electricity
21 - Electric and Magnetic Fields
22 - Electromagnetism and Induction
23 - Light and Color
24 - Geometrical Optics
25 - Electromagnetic Radiation
26 - The Properties of Matter
27 - Thermodynamics and Heat Transfer
28 - The Atom
29 - The Quantum Theory
30 - TBD
31 - TBD
32 - TBD
33 - TBD
34 - TBD
35 - TBD
36 - TBD
37 - The atomic nucleus and radioactivity
38 - Nuclear reactions
39 - Relativity
40 - Particle physics and the standard model
41 - Electronics (semiconductors)
42 - Nuclear technology
43 - Lasers and photonics
44 - Metals, alloys and materials science
45 - Communications technology
46 - Buildings and structures
47 - Energy technology
48 - Biophysics
49 - Matter and Energy, Space and Time
50 - Energy Transformations
51 - Nanotechnology
52 - Website Videos
53 - ExtraStuff
55 - Modeling Motion, Friction, and Center of Mass
56 - Work and the Conservation of Energy
Section 1 review
Position describes a location in space relative to an origin. Velocity is the rate of change in position over time, which can be positive or negative depending on the direction or motion. Speed is the absolute value of velocity. Acceleration is the rate of change of velocity, and can also be positive or negative. The graphs of position vs. time and velocity vs. time are useful tools for analyzing motion. The slope of the x vs. t graph is the velocity and the slope of the v vs. t graph is the acceleration. Both position, velocity, and acceleration are connected through equations that are used to build mathematical models of motion.
Vocabulary words position, origin, coordinates, displacement, vector, magnitude, scalar, speed, velocity, slope, acceleration, average velocity, instantaneous velocity

Key equations
v= d t
v= Δx Δt
a= Δv Δt
v= v 0 +at
x= x 0 + v 0 t+ 1 2 a t 2

Review problems and questions
Graph of position vs. time
  1. The plot on the right shows the graph of position versus time of a vehicle. Answer the following questions:
    1. What is the total distance traveled by the vehicle?
    2. How far does the vehicle travel in one hour?
    3. What is the average speed of the vehicle?
    4. What is the maximum speed of the vehicle?
    5. How long does it take for the vehicle to travel 80 km?
      6. Show
  1. You start driving from Austin towards Houston with a constant speed of 120 km/h (75 mph). After 1.5 hours you stop for 0.5 hours. Then you continue driving with a new constant speed, v2, and reach Houston 45 minutes later.
    1. If the total distance from Austin to Houston is 265 km, what is the speed v2?
    2. What was your average speed during the trip? Show
Graph of velocity vs. time
  1. The plot on the right shows a velocity versus time graph of a vehicle. Answer the following questions.
    1. What is the acceleration of the vehicle during the first minute? Give your answer in m/s2 and km/h2
    2. After the first minute, does the acceleration of the vehicle increase or decrease? Explain your answer.
    3. What is the acceleration in the time interval between 3 and 7 minutes?
    4. What is the acceleration between 7 and 10 minutes?
    5. During which time interval does the vehicle have its maximum acceleration? Show

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