Introduction to Physics

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Questions and Answers

Which of the following scenarios best illustrates Newton's third law of motion?

A ball rolling down a hill gains speed.
A car accelerates forward due to the engine's force.
When you jump, your body accelerates upwards as Earth applies force, and Earth also accelerates downwards because your body is applying force to it. (correct)
A book remains at rest on a table.

Electromagnetism exclusively deals with interactions between static electric charges.

False (B)

Provide a concise definition of 'torque' and explain its role in rotational motion.

Torque is a twisting force that causes rotation about an axis. It plays a similar role in rotational motion as force does in linear motion, affecting the angular acceleration of an object.

The Zeroth Law of Thermodynamics allows us to define and measure ______.

temperature Signup and view all the answers

Match the following concepts with their area of physics:

Kinetic Energy = Mechanics Heat Transfer = Thermodynamics Quantum Entanglement = Quantum Mechanics Spacetime = Relativity Signup and view all the answers

According to classical mechanics, which quantity remains constant in an isolated system?

Momentum (B) Signup and view all the answers

Work is defined solely by the magnitude of the force applied to an object, irrespective of the distance over which it acts.

False (B) Signup and view all the answers

Which of the following is the best example of potential energy?

A compressed spring (D) Signup and view all the answers

According to the first law of thermodynamics, what does $ΔU = Q - W$ represent?

The change in internal energy of a system. (C) Signup and view all the answers

The second law of thermodynamics implies that in an isolated system, entropy can only decrease or remain constant.

False (B) Signup and view all the answers

What phenomenon explains why a metal spoon gets hot when left in a hot cup of coffee?

Conduction Signup and view all the answers

__________ is the ability of a system to store electric charge.

Capacitance Signup and view all the answers

Match the following terms with their descriptions:

Reflection = The bouncing of light off a surface Refraction = The bending of light as it passes from one medium to another Diffraction = The spreading of waves as they pass through an opening Interference = The superposition of waves, resulting in constructive or destructive patterns Signup and view all the answers

Ohm's Law relates voltage, current, and resistance. Which of the following equations represents Ohm's Law?

V = IR (D) Signup and view all the answers

According to special relativity, the speed of light is different for every observer.

False (B) Signup and view all the answers

What term describes the phenomenon where two or more particles become linked, and the state of one instantly affects the state of the other, regardless of distance?

Quantum entanglement Signup and view all the answers

The equation $E=mc^2$ describes the principle of __________.

Mass-energy equivalence Signup and view all the answers

Which of the following is a consequence of general relativity?

Gravitational waves (B) Signup and view all the answers

Flashcards

What is Physics?

Study of matter, energy, motion, and forces in the universe.

What is Kinematics?

Describes motion of objects without considering the causes.