Newtonian Mechanics and relativistic mechanics December 7, 2023 Contents Results - #1. According to Newton's First Law of Motion, an object will remain at rest unless: An unbalanced force acts on it An unbalanced force acts on it It has mass It has mass It is in motion It is in motion Gravity is acting on it Gravity is acting on it #2. Newton's Second Law relates force, mass, and acceleration. The formula representing this law is: F=mg F=mg F=ma F=ma F=a/m F=a/m F=g/m F=g/m #3. In Newton's Third Law, when you sit in a chair, your weight is the action force. What is the reaction force? The force exerted by the chair The force exerted by the chair Gravity pulling you down Gravity pulling you down Friction between you and the chair Friction between you and the chair Normal force exerted by the chair Normal force exerted by the chair #4. If you double the force applied to an object of constant mass, what happens to its acceleration? It is halved It is halved It is doubled It is doubled It remains the same It remains the same It quadruples It quadruples #5. Which of Newton's laws explains why a rocket moves forward as exhaust gases are expelled backward? Newton's First Law Newton's First Law Newton's Second Law Newton's Second Law Newton's Third Law Newton's Third Law Law of Universal Gravitation Law of Universal Gravitation #6. In circular motion, the force directed toward the center of the circle is called: Centrifugal force Centrifugal force Centripetal force Centripetal force Frictional force Frictional force Tension force Tension force #7. The gravitational force between two objects depends on: The distance between the objects The distance between the objects The masses of the objects The masses of the objects Both A and B Both A and B Neither A nor B Neither A nor B #8. If an object is in equilibrium, the net force acting on it is: Zero Zero Positive Positive Negative Negative Constant Constant #9. According to Newton's Law of Universal Gravitation, the force between two masses is directly proportional to the: Product of the masses Product of the masses Square of the distance between the masses Square of the distance between the masses Inverse square of the distance between the masses Inverse square of the distance between the masses Square root of the product of the masses Square root of the product of the masses #10. When a net external force is applied to an object, what happens to its momentum? Momentum remains constant Momentum remains constant Momentum increases Momentum increases Momentum decreases Momentum decreases Momentum becomes zero Momentum becomes zero #11. Which of Newton's laws is often summarized as "For every action, there is an equal and opposite reaction"? Newtonâ€™s 1st law Newtonâ€™s 1st law Newtonâ€™s 2nd law Newtonâ€™s 2nd law Newtonâ€™s 3nd law Newtonâ€™s 3nd law Newtonâ€™s law of universal gravitation Newtonâ€™s law of universal gravitation #12. Special Relativity was introduced by: Isaac Newton Isaac Newton Albert Einstein Albert Einstein Max Planck Max Planck Niels Bohr Niels Bohr #13. Accrding to Special Relativity, as an object with mass approaches the speed of light, its relativistic mass: Decreases Decreases Increases Increases Remains constant Remains constant Becomes zero Becomes zero #14. The equation E=mc2 relates: Energy, mass, and charge Energy, mass, and charge Energy, mass, and velocity Energy, mass, and velocity Energy, momentum, and mass Energy, momentum, and mass Energy, speed, and charge Energy, speed, and charge #15. In Special Relativity, time dilation occurs when: Time speeds up Time speeds up Time slows down for a moving observer Time slows down for a moving observer Time remains constant Time remains constant Time becomes imaginary Time becomes imaginary #16. The Lorentz contraction refers to the: Contraction of time Contraction of time Contraction of space Contraction of space Expansion of mass Expansion of mass Expansion of energy Expansion of energy #17. The speed of light-c is approximately: 300,000 m/s 300,000 m/s 3,000,000 m/s 3,000,000 m/s 30,000,000 m/s 30,000,000 m/s 300,000,000 m/s 300,000,000 m/s #18. According to Special Relativity, mass and energy are interchangeable, as expressed by: Newton's Law of Gravitation Newton's Law of Gravitation Einstein's Field Equations Einstein's Field Equations Planck's Law Planck's Law Einstein's Mass-Energy Equivalence Einstein's Mass-Energy Equivalence #19. As an object with mass approaches the speed of light, its momentum: Decreases Decreases Increases Increases Remains constant Remains constant Becomes zero Becomes zero #20. In relativistic mechanics, what happens to an object's length as its velocity approaches the speed of light? It increases It increases It decreases It decreases It remains constant It remains constant It becomes infinite It becomes infinite Finish