Top Tweets for #GenPhys1

Tom Wong @thomasgwong

3 days ago

Yesterday in #PHY201 #GenPhys1: A box is moved some distance by several forces, including yours (F). The work you did is the component of your force along the direction of movement (Fcosθ), times the distance. Your perpendicular component (Fsinθ) didn't contribute to the work.

thomasgwong's tweet photo. Yesterday in #PHY201 #GenPhys1: A box is moved some distance by several forces, including yours (F). The work you did is the component of your force along the direction of movement (Fcosθ), times the distance. Your perpendicular component (Fsinθ) didn't contribute to the work. https://t.co/lwcFzni27h

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Tom Wong @thomasgwong

10 days ago

Today in #PHY201 #GenPhys1: Static friction has strength up to the coefficient of static friction (μₛ) times the normal force (N). Beyond that, it slips, and kinetic friction is μₖN. Objects in circular motion have centripetal acceleration.

thomasgwong's tweet photo. Today in #PHY201 #GenPhys1: Static friction has strength up to the coefficient of static friction (μₛ) times the normal force (N). Beyond that, it slips, and kinetic friction is μₖN. Objects in circular motion have centripetal acceleration. https://t.co/EAEoC8jte5

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Tom Wong @thomasgwong

12 days ago

Lately in #PHY201 #GenPhys1: Applications of Newton's 2nd Law involving the normal force, inclines, multiple objects, and tension.

thomasgwong's tweet photo. Lately in #PHY201 #GenPhys1: Applications of Newton's 2nd Law involving the normal force, inclines, multiple objects, and tension. https://t.co/CJZEnvXGmt

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Tom Wong @thomasgwong

19 days ago

Today in #PHY201 #GenPhys1: Near the surface of the earth, the force of gravity is mg, which is weight. Objects resting on a surface experience a normal force perpendicular to the surface, and it could be equal to, greater than, or less than the weight depending on the situation.

thomasgwong's tweet photo. Today in #PHY201 #GenPhys1: Near the surface of the earth, the force of gravity is mg, which is weight. Objects resting on a surface experience a normal force perpendicular to the surface, and it could be equal to, greater than, or less than the weight depending on the situation. https://t.co/JNFMAxICl2

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Tom Wong @thomasgwong

19 days ago

Today in #PHY201 #GenPhys1: The first exam, covering units, 1D kinematics, vectors, and 2D kinematics.

thomasgwong's tweet photo. Today in #PHY201 #GenPhys1: The first exam, covering units, 1D kinematics, vectors, and 2D kinematics. https://t.co/Nb15y9wRh8

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Tom Wong @thomasgwong

28 days ago

Today in #PHY201 #GenPhys1: If I drive in a circle at a constant speed, my velocity is changing because my direction is changing. So, I have an acceleration--centripetal acceleration--that points toward the center of the circle, even though I'm not speeding up or slowing down.

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Tom Wong @thomasgwong

about 1 month ago

Today in #PHY201 #GenPhys1: In projectile motion, there is constant velocity in the x-direction (with two equations) and constant acceleration in the y-direction (with four equations).

thomasgwong's tweet photo. Today in #PHY201 #GenPhys1: In projectile motion, there is constant velocity in the x-direction (with two equations) and constant acceleration in the y-direction (with four equations). https://t.co/vgs5FkfNKd

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Tom Wong @thomasgwong

about 1 month ago

Today in #PHY201 #GenPhys1: Ignoring air resistance, objects near the surface of the earth feel an acceleration due to gravity of -9.8 m/s^2, regardless of the mass of the object. This is constant acceleration, so we can use the kinematic equations for such "free fall" problems.

thomasgwong's tweet photo. Today in #PHY201 #GenPhys1: Ignoring air resistance, objects near the surface of the earth feel an acceleration due to gravity of -9.8 m/s^2, regardless of the mass of the object. This is constant acceleration, so we can use the kinematic equations for such "free fall" problems. https://t.co/PPJEb59le2

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Tom Wong @thomasgwong

about 2 months ago

Today in #PHY201 #GenPhys1: If I walk 2 m right and 3 m left, how far did I travel? Two possible answers: (1) 5 m is distance, a scalar. (2) -1 m is displacement, a vector. Velocity is the slope of a position vs time graph, and speed its magnitude.

thomasgwong's tweet photo. Today in #PHY201 #GenPhys1: If I walk 2 m right and 3 m left, how far did I travel? Two possible answers:
(1) 5 m is distance, a scalar.
(2) -1 m is displacement, a vector.
Velocity is the slope of a position vs time graph, and speed its magnitude. https://t.co/gzFmjeyPpc

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Tom Wong @thomasgwong

about 2 months ago

Today in #PHY201 #GenPhys1: We will use SI units, which are the same anywhere in the universe. The second is defined by the frequency of light to excite electrons in cesium atoms, the meter by the speed of light, and kilogram by the energy of photons.

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Tom Wong @thomasgwong

about 2 months ago

First day of #PHY201 #GenPhys1: Course introduction, about me, and each student. Almost every student needs the course for medical school, dental school, physical therapy school, or some other professional program. Then a math assessment to help students brush up.

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Tom Wong @thomasgwong

about 2 months ago

Happy New (School) Year! This semester, I'm teaching: 1. Quantum Physics and Technology for Everyone #PHY131 #QuantumForEveryone 2. General Physics for the Life Sciences 1 #PHY201 #GenPhys1 3. Quantum Mechanics #PHY531 #QuantumMechanics

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Tom Wong @thomasgwong

10 months ago

Today in #PHY201 #GenPhys1: The Physics Department is quite diligent about assessment, and students took an assessment that is identical to one from the beginning of the semester. The data helps us evaluate our programs. Also, we began reviewing for next week's final.

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Tom Wong @thomasgwong

11 months ago

Today in #PHY201 #GenPhys1: Tensile/compressive, volume, and sheer stress and strain have similar formulas. Stress is force per area. Strain is change in some geometric quantity divided by the initial value. Stress equals a modulus times strain.

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Tom Wong @thomasgwong

11 months ago

Today in #PHY201 #GenPhys1: Applying a stress to a rod and letting go, it temporarily stretches, called elastic deformation. Beyond its elastic limit or yield strength, it permanently deforms, called plastic deformation. Beyond its ultimate breaking strength, it breaks.

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Tom Wong @thomasgwong

11 months ago

Yesterday in #PHY201 #GenPhys1: Rolling down a ramp moves is slower than sliding without friction, since some energy goes into rotation instead of translation. A spinning ice skater speeds up when pulling in their hands due to conservation of angular momentum.

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Tom Wong @thomasgwong

11 months ago

Today in #PHY201 #GenPhys1: In problems involving rotational dynamics, we often use both Newton's law for translation ∑F = ma and Newton's law for rotation ∑𝜏=Iα. For statics problems, a = 0 and α = 0. We did several biomechanics problems.

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Tom Wong @thomasgwong

11 months ago

Yesterday in #PHY201 #GenPhys1: The rotational analogues of position, velocity, and acceleration follow the same kinematic equations under constant acceleration (pictured). Torque is the analogue of force, and net torque is moment of inertia times angular acceleration.

thomasgwong's tweet photo. Yesterday in #PHY201 #GenPhys1: The rotational analogues of position, velocity, and acceleration follow the same kinematic equations under constant acceleration (pictured). Torque is the analogue of force, and net torque is moment of inertia times angular acceleration. https://t.co/PRkReM9JlL

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Tom Wong @thomasgwong

12 months ago

Today in #PHY201 #GenPhys1: In a 1D elastic collision of two objects, relative velocity flips. In a ballistic pendulum, cons' of momentum is followed by cons' of energy. In a 2D collision, use components. Spreading an impulse over a longer time decreases the average force.

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Tom Wong @thomasgwong

12 months ago

Yesterday in #PHY201 #GenPhys1: A net force applied for some time changes the momentum of the system. In an isolated system, momentum is conserved. We calculated how fast Fulton Reed's hockey puck must travel in The Mighty Ducks to knock a goalie into the goal.

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