College Physics Pro Help!
Q: Why does normal force do zero work? A: Work is the dot product of Force vector and Displacement vector. See my post about the operations of vector for dot product on https://www.physicsdoable.com/posts/2020-11-06-highlights-of-questionanswer/As seen in the picture, Normal force is always perpendicular to the contact surface, while the Velocity (Displacement) is always parallel to the […]
2020-11-15 Highlights of Question&Answer Read More »
Q: I was wondering which equations of Circular Motion will be provided in quiz/exam. Also, could you review how to derive certain circular/orbiting motion equations that we might need to use in quiz/exam from the equations given. Like the period equation: T^2=(4pi^2r^3)/(GM)But I am confused on how to get to this equation. A: The equations
2020-11-13 Highlights of Question&Answer Read More »
Q: When a car is rounding a banked curve (the surface of the road is angled), what type of friction is there between the car and the road that helps create the Fc and what direction is the friction pointing? I am slightly confused. As I know the car is moving, so wouldn’t the friction
2020-11-11 Highlights of Question&Answer Read More »
Q: I have trouble figuring out what force is nonzero and what force is zero. Additionally, I would like to clarify how the forces are negative or positive when an object is speeding up or slowing down — how do these factors influence the forces? I assume that forces like friction and weight are negative
2020-11-09 Highlights of Question&Answer Read More »
Another cool project is called “Hovercraft”! The materials given include: a CD disk, a plastic push/pull bottle cap (“valve”), several balloons, a tube of glue. To compose the system, just glue the cap/valve at the center of the CD. Make sure they are aligned so that the air can flow freely through the hole of
Kids also have the fun of Physics! (3) Read More »
Q: I am wondering about i and j notation for vectors. What types of problems require i and j notation? Also, what is the correct format and common errors associated with i and j notation? A: In general, i, j, k notations are useful in any problems having vector(s) involved. I reviewed the basic operation
2020-11-06 Unit vectors (i, j, k notation) and the applications Read More »
Q: So I am majoring in architecture and I am very curious about the role of physics in architecture in general. I know physics broadens our understanding of how objects work together but I am wondering if there are any aspects of physics that we are learning that might relate to architecture? I was thinking
2020-11-04 Highlights of Question&Answer Read More »
Q: How are coefficients of friction determined? I know that they are given in problems, but how would a physicist go from having a surface to figuring out its kinetic/static/rolling friction coefficient? Is there a tool that they use to measure something? A: For Kinetic and Static friction coefficients, the principle is simple and the
2020-11-02 Highlights of Question&Answer (Friction topic) Read More »
Q: How do we know what type of energy the problem is talking about? I don’t really understand the difference between Kinetic, Mechanical, Conservative, Potential Energy’s difference other than they have different equations. I’m confused about how to determine the differences in the types of energy and how to know which one to solve for
2020-11-01 Highlights of Question&Answer Read More »
In this project named “Catapult”, the materials given are: Popsicle sticks, Plastic spoon, Rubber bands, and Cotton balls. The composition is straightforward by following the simple instructions. Let us have fun and identify the Physics behind each step in the game:) (1) Set up the composed system as seen in the picture and load a
Kids also have the fun of Physics! (2) Read More »
