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Physics Problem Cases
1. Newton's First Law
Why does a stationary object remain at rest unless acted upon by an external force?
Solution: Due to the object's inertia, it resists any change in its state of motion.
2. Conservation of Momentum
Two skaters push off each other. What happens to their velocities?
Solution: The total momentum remains constant, so they move in opposite directions with equal and opposite momentum.
3. Projectile Motion
How does gravity affect the motion of a thrown ball?
Solution: Gravity causes a parabolic trajectory, pulling the ball downward as it moves forward.
4. Frictional Force
Why does a sliding object slow down?
Solution: Friction opposes the motion, converting kinetic energy into heat.
5. Buoyancy
Why does an object float in water?
Solution: The upward buoyant force equals the weight of the displaced water.
6. Simple Harmonic Motion
What determines the period of a pendulum?
Solution: The period depends on the length of the pendulum and gravity but not on the mass.
7. Thermal Expansion
Why do bridges have expansion joints?
Solution: To accommodate the expansion and contraction due to temperature changes.
8. Refraction
Why does a straw appear bent in water?
Solution: Light changes direction when moving between media of different densities.
9. Ohm's Law
How does current relate to voltage and resistance?
Solution: Current is directly proportional to voltage and inversely proportional to resistance.
10. Conservation of Energy
What happens to energy in a pendulum?
Solution: Energy transforms between potential and kinetic, with total energy remaining constant.
11. Electromagnetic Induction
How is electricity generated in a coil?
Solution: A changing magnetic field induces an electric current in the coil.
12. Doppler Effect
Why does the sound of a siren change as it passes by?
Solution: The frequency of the sound waves changes due to the relative motion of the source and observer.
13. Circular Motion
What keeps a satellite in orbit?
Solution: The gravitational force provides the centripetal force needed for circular motion.
14. Photoelectric Effect
Why do electrons get emitted when light shines on metal?
Solution: Light energy transfers to electrons, overcoming the work function of the metal.
15. Heat Transfer
How does heat travel through materials?
Solution: Heat transfers via conduction, convection, and radiation.
16. Torque
What causes a door to rotate when pushed?
Solution: The applied force creates torque about the hinge, causing rotation.
17. Wave Interference
Why do patterns form when waves overlap?
Solution: Constructive and destructive interference create a pattern of nodes and antinodes.
18. Gravity
Why do objects fall at the same rate regardless of mass?
Solution: Acceleration due to gravity is constant for all objects in free fall.
19. Magnetic Force
What happens when a current-carrying wire is in a magnetic field?
Solution: The wire experiences a force perpendicular to both the current and the magnetic field.
20. Thermal Conductivity
Why does metal feel colder than wood at the same temperature?
Solution: Metal conducts heat away from your hand more effectively than wood.
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