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ap physics 1
👉 AP Physics Essentials
👟 Unit 1 - Kinematics
1.1Position, Velocity, and Acceleration
🌀 Unit 2 - Dynamics
2.5Newton's Third Law and Free-Body Diagrams
🚀 Unit 3 - Circular Motion
3.0Unit 3 Overview: Circular Motion and Gravitation
3.3Gravitational and Electric Forces
3.4Gravitational Field/Acceleration Due to Gravity on Different Planets
3.5Inertial vs. Gravitational Mass
3.7Free-Body Diagrams for Objects in Uniform Circular Motion
⚡️ Unit 4 - Energy
4.1Open and Closed Systems: Energy
4.2Work and Mechanical Energy
⛳️ Unit 5 - Momentum
🎸 Unit 6 - Simple Harmonic Motion
6.1Period of Simple Harmonic Oscillators
🎡 Unit 7 - Torque & Rotational Motion
7.2Torque and Angular Acceleration
7.3Angular Momentum and Torque
💡 Unit 8 - Electric Charges & Electric Force
8.0Unit 8 Overview: Electric Charge and Electric Force
8.1Conservation of Charge
🔋 Unit 9 - DC Circuits
9.1Definition of a Circuit
9.3Ohm’s Law, Kirchhoff’s Loop Rule (Resistors in Series and Parallel)
🔊 Unit 10 - Mechanical Waves & Sound
10.1Properties of Waves
10.3Interference and Superposition (Waves in Tubes and on Strings)
✍️ Free Response Questions (FRQs)
Quantitative / Qualitative Translation
⏱️ 1 min read
May 31, 2020
When you’re given a two object problem and you’re asked to calculate the change in momentum, take into account the initial momentum and the final momentum individually first of each object. pinitial = pfinal. When you solve for the final momentum, decide whether you should use an individual mass value or the sum of all masses in the system.
If you’re solving for the final velocity of the system, then you should absolutely use the sum of both masses regardless of how many objects there are. If an object is initially at rest, it’s initial momentum will be zero since its velocity in the beginning was zero (p = m*v).
Change in momentum is proportional to the force and time so if you decrease T or F, you decrease the change in momentum.
Image Credit: ponderisd.net
You need to be able to interpret different scenarios, especially with problems that have multiple external forces acting on the system. When you see problems like that, make sure you find the vector sum of the forces after calculating individual forces. If you’re looking for the momentum, you can either find individual momentums of the objects or find the total momentum of the system. Understand how to apply the formula and make sure you can explain your thought process because some FRQ’s ask for conceptual explanations.
Image Credit: studyblue.com
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