2.4 
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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 4 review
Solving physics problems usually involves translating the language of the problem into mathematical statements: identify what is asked for in the question; determine what quantities and other information are given to you; identify key relationships among the quantities; and solve the problem. In the process, it is important to assign variables to quantities, identify which quantities are known and unknown, and use consistent units.

Review problems and questions
  1. A student on a bicycle is stopped at an intersection. She accelerates from rest at 0.2 m/s2 for ten seconds, then travels at constant speed for another ten seconds. How far did she travel? Show
  1. Two cars are initially separated by 1 km and traveling towards each other, one at 30 miles per hour and the other at 30 kilometers per hour. In kilometers how far from their respective starting points do the two cars meet? Show
  1. A driver is traveling at 35 mph when he sees a deer in the road 20 m ahead and slams on the brakes. It takes him half a second between seeing the deer and hitting the brakes. Once he starts braking, his deceleration is 5 m/s2.
    1. How far does he travel before coming to a complete stop? Does he hit the deer?
    2. How much total time has elapsed when he comes to a stop?
    3. What speed would he have to have been traveling so that he would stop just short of the deer? Show
  1. The Moon's gravity produces an acceleration of 1.6 m/s2 at its surface. How long does it take a ball, dropped from a height of 1.5 m, to fall to the surface? How does this compare to the time for the ball to fall from the same height to the surface of the Earth? Show
  1. Two cars start from the same starting line. Car A travels at a constant speed of 10 m/s. Car B starts from rest and accelerates at a rate of 3 m/s2.
    1. How long after they start moving are they both at the same distance from the starting line?
    2. At that point, how far are they from the starting line?
    3. How fast is each car traveling at that time? Show
  1. Two students, each weighing 50 kg, are standing 1 m apart. What is the ratio of their mutual gravitational force to the gravitational force each of them experiences from the Earth? Show
  1. The Earth is located at 1.5×1011 m from the Sun and assume that it orbits in a circle. (Earth has a mass of 6.0×1024 kg. The Sun has a mass of 2.0×1030 kg.)
    1. What is the gravitational force necessary to maintain its circular orbit?
    2. What is the velocity of the Earth around its orbit?
    3. What is the angular velocity of the Earth's orbit? Show

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