2.2 
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Videos:
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
2E: Newton's second law
How do we predict the action of forces on motion?
How is the Second Law used?
Motion changes through the action of forces. The changes occur through acceleration because acceleration is a direct consequence of a non-zero net force. Models of motion start by calculating the acceleration from knowledge of forces. Acceleration is used to determine changes in velocity, which are used to determine changes in position.
Part 1: Modeling the action of a force

Interactive simulation to model motion in the presence of applied force
  1. The interactive model shows position and velocity versus time graphs. Red circles on the position vs. time graph are “targets.” Adjust the initial parameters, initial velocity (v0), force (F) and mass (m) so the curves hit both targets.
  2. [Run] starts the simulation. [Stop] stops it without changing values. [Clear] resets all variables to zero. [Reset] resets all variables and sets new targets.
  3. Enter values in the white boxes. The top score of 100 is achieved by hitting the center of each target.
  1. Compare how 1 N of force effects the motion of a 5 kg ErgoBot versus a 0.2 kg ErgoBot.
  2. Describe the connection between force and acceleration.
Newton's second law (basic version) In this interactive simulation, you will create a model for the motion of the ErgoBot by adjusting the values of the initial velocity, force, and mass. The goal is to cause the force to effect the ErgoBot's motion to pass through the target circles on the position vs. time graph.
Part 2: Dynamic modeling

Interactive simulation to model motion in the presence of applied force for several time steps
  1. The second model allows you to set the force for four different time intervals, each 2.5 seconds long.
  2. In this model, unlike the first, you can set the starting position (x0) in addition to the initial velocity, mass, and four periods of force.
  3. Try to hit the centers of the four target red circles.
  1. What sections of the graphs are curved and which are linear? Why?
  2. If the ErgoBot's mass is doubled, how is the displacement effected?
Newton's second law (more advanced version) In this interactive simulation, you will create a model for the motion of the ErgoBot by adjusting the values of the initial position, initial velocity, mass, and four periods of force. The goal is to cause the force to effect the ErgoBot's motion to pass through the four target circles on the position vs. time graph.

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