All Flashcards
What are the differences between normal force at the top and bottom of a vertical loop?
Top: Fn and Fg point in the same direction. Bottom: Fn and Fg point in opposite directions.
Compare the net force at the top and bottom of a vertical loop.
Top: . Bottom: .
Compare centripetal and tangential acceleration in uniform circular motion.
Centripetal: Always present, directed towards the center. Tangential: Zero in uniform circular motion.
Compare the direction of gravitational force on Earth versus in a planet's orbit.
Earth: Always downwards. Orbit: Acts as the centripetal force, pointing toward the center of the orbit.
Differentiate between Method 1 (Point Mass) and Method 2 (Detailed) for drawing FBDs.
Method 1: Object represented as a dot, forces drawn from the dot. Method 2: Forces drawn at specific points where they are exerted on the object.
What are the steps to draw an FBD?
- Represent the object as a dot. 2. Draw arrows outward from the dot to represent forces. 3. Label each force with its appropriate symbol.
How do you analyze forces in uniform circular motion using an FBD?
- Draw the FBD. 2. Choose a coordinate system with one axis pointing towards the center of the circle. 3. Apply Newton's Second Law, , where is the net force towards the center (centripetal force).
What is the effect of the net force pointing towards the center of the circle?
The object moves in a circular path.
What happens if you forget to include all relevant forces in your FBD?
Incorrect analysis of the motion and incorrect calculations of net force.
What is the effect of doubling the speed of an object in circular motion?
The centripetal force required quadruples.
What happens when the normal force is greater than weight at the bottom of a loop?
You feel heavier.
What happens if the speed of the block is doubled in the Free Response Question?
The new tension in the string will be 144 N.