2.5 
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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
Chapter 2 Review

    Conceptual Questions
      Section 2.1
      1. Which object is moving faster, one with a steep slope on a distance vs. time graph or one with a shallow slope.

      2. Easy If an bird flies at the constant velocity of 125m/s, what is its acceleration for the first 5 seconds?

      3. Are the following vector or scalar quantities?
        1. Temperature
        2. Computer memory space
        3. Location from a GPS
        4. Speedometer reading

      4. Easy Describe three different ways you can travel 100 meters in ten seconds. Each different way must specify speed(s) and time(s).

      5. Easy Describe what constant positive acceleration looks like on an acceleration vs. time graph, a velocity vs. time graph, and a distance vs. time graph.

      6. What is the difference between position and displacement?

        Graph of velocity vs. time
      7. Medium Draw the distance vs. time graph for this velocity vs. time graph. (Make sure to look at the scale of the y-axis.)

      8. Challenging Say an object has negative acceleration.
        1. Is it possible that its speed can be increasing? How?
        2. What must be the signs of velocity and acceleration to be sure that speed is increasing?

      9. Where is the origin of Earth's geographical coordinates?

      10. How can you convert a vector to a scalar?

      11. On a velocity versus time graph, what does the area under the curve represent?

        Section 2.2
        1. You and your friend want to balance a teeter-totter, but your friend is much heavier than you. How can you balance it?

        2. Challenging If, according to Newton's third law, every reaction has an equal and opposite reaction, then how can motion ever occur? Wouldn't every force be canceled out by its reaction force?

        3. Easy Say you drop two cannonballs out of a high window. The first cannonball is twice as heavy as the second. Which will hit the ground first if there is no air resistance.

        4. Easy If every action has an equal and opposite reaction, than when you jump and gravity pulls you back down, it also pulls the Earth up to you. Why can't you see this motion?

        5. Easy If you want to increase an object's momentum by the greatest amount possible, should you double the mass or the velocity while keeping the other the same?

        6. Easy The tendency of a moving body to keep moving and a body at rest to stay at rest is described by the first of which set of principles?

        7. Medium Why does it hurt more to kick a bowling ball than a beach ball?

        8. Medium Which of Newton's laws best explains why it hurts to punch someone?

        9. Does a spring scale measure weight or mass? Why?

        10. What is the difference between mass and weight? What units of the metric system are used to describe them? What United States customary units are used?

        11. What quantities sum to zero when an system is in equilibrium?

        12. How would you calculate the spring constant of a unknown spring?

        Section 2.3
        1. Easy Which has a higher linear velocity, a big wheel or a small wheel with the same angular velocity?

        2. Is a radian larger or smaller than a degree?

        3. Challenging When you are in a situation involving circular motion, such as in a car going around a tight corner, you feel like you are being pulled away from the center of the circle. If centripetal force acts towards the center of the circle, why is this?

        4. Easy A roller coaster car in an amusement park goes around a tight turn. What force is acting on the cart as it makes this circular motion? What direction is this force acting?


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