Ch 2: Newton's laws
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Questions and Answers

What does Newton's second law, F = ma, state?

  • Force is inversely proportional to mass
  • Force is directly proportional to acceleration (correct)
  • Acceleration is inversely proportional to force
  • Acceleration is directly proportional to mass

    • Why do passengers in a car lurch forward when the vehicle suddenly stops?

  • Due to friction
  • Due to gravity
  • Due to air resistance
  • Due to inertia (correct)

    • In Newton's third law, what happens when object A exerts a force on object B?

  • Object A accelerates
  • Object B exerts a greater force on object A
  • Object B does not react
  • Object B exerts an equal and opposite force on object A (correct)

    • Why does pushing a car result in only modest acceleration compared to pushing a skateboard?

    <p>Cars have a greater mass</p> Signup and view all the answers

    What does the concept of equilibrium refer to in physics?

    <p>Balanced forces on an object</p> Signup and view all the answers

    How do Newton's laws help us in designing vehicles and structures?

    <p>By modeling forces involved in the Earth's atmosphere</p> Signup and view all the answers

    What happens to a rocket during lift-off according to Newton's third law?

    <p>The rocket exerts an upward force on the exhaust gases</p> Signup and view all the answers

    What is the other name for Newton's first law of motion?

    <p>The Law of Inertia</p> Signup and view all the answers

    According to Newton's first law, what happens to an object at rest?

    <p>It remains at rest</p> Signup and view all the answers

    In the absence of external forces, what will happen to an object in motion according to Newton's first law?

    <p>It will maintain its motion with constant velocity</p> Signup and view all the answers

    Which principle highlights the resistance of any object to changes in its state of motion?

    <p>The Law of Inertia</p> Signup and view all the answers

    What is the practical implication of Newton's first law for a spacecraft in the vacuum of space?

    <p>It will continue moving indefinitely in the same direction and at the same speed</p> Signup and view all the answers

    Which law describes the relationship between a body and the forces acting upon it?

    <p>Newton's Laws of Motion</p> Signup and view all the answers

    What does Newton's first law state about objects in motion?

    <p>They will move with constant velocity</p> Signup and view all the answers

    Which term refers to the situation when no external force acts on an object?

    <p>Balanced forces</p> Signup and view all the answers

    What does Newton's second law, F = ma, quantitatively describe?

    <p>The relationship between force and acceleration</p> Signup and view all the answers

    Why does a rocket's acceleration increase during flight even if the thrust remains constant?

    <p>Due to a decrease in the rocket's mass</p> Signup and view all the answers

    Which example best illustrates Newton's third law of action and reaction?

    <p>A person pushing against a brick wall</p> Signup and view all the answers

    How does the concept of equilibrium apply to objects in physics?

    <p>Objects are acted upon by balanced forces</p> Signup and view all the answers

    In physics, why is pushing a car more challenging in terms of acceleration than pushing a skateboard?

    <p>Because cars have more mass than skateboards</p> Signup and view all the answers

    What is the primary factor affecting the acceleration of an object according to Newton's second law?

    <p>Net force acting on the object</p> Signup and view all the answers

    Why do passengers in a car lurch forward when it suddenly stops?

    <p>Due to inertia carrying their bodies forward</p> Signup and view all the answers

    Which concept allows us to predict weather patterns and understand climate change through modeling the Earth's atmosphere and oceans?

    <p>&quot;Newton's Laws of Motion&quot;</p> Signup and view all the answers

    According to Newton's first law of motion, what will happen to an object in motion if no external forces act upon it?

    <p>It will continue moving at a constant velocity</p> Signup and view all the answers

    How does Newton's first law define the state of motion of an object at rest?

    <p>It remains at rest unless an external unbalanced force acts on it</p> Signup and view all the answers

    In the absence of external forces, what happens to a spacecraft in motion according to Newton's first law?

    <p>It will continue moving in the same direction at a constant speed</p> Signup and view all the answers

    Which term describes the concept of an object's resistance to changes in its state of motion as highlighted by Newton's first law?

    <p>Inertia</p> Signup and view all the answers

    What type of motion will an object experience if an external unbalanced force acts upon it according to Newton's first law?

    <p>Change in velocity</p> Signup and view all the answers

    If a car suddenly stops, what physics principle explains why passengers lurch forward?

    <p>Conservation of momentum</p> Signup and view all the answers

    Which statement best describes the effect of an external unbalanced force on an object's motion according to Newton's first law?

    <p>It alters the object's trajectory and speed</p> Signup and view all the answers

    What principle asserts that an object will not change its motion unless a force acts upon it?

    <p>Newton's first law</p> Signup and view all the answers

    Which term best describes the concept that an object in motion will stay in motion with a constant velocity unless acted upon by an external unbalanced force?

    <p>Terminal velocity</p> Signup and view all the answers

    If a spacecraft is moving in space without any external forces acting on it, what will happen to its motion according to Newton's first law?

    <p>It will maintain its motion at a constant velocity.</p> Signup and view all the answers

    Which law of motion highlights the resistance of any physical object to changes in its state of motion?

    <p>Newton's first law</p> Signup and view all the answers

    What does Newton's first law suggest about the motion of an object at rest?

    <p>The object will remain at rest forever.</p> Signup and view all the answers

    Which term refers to the property of an object to resist changes in its state of motion?

    <p>Inertia</p> Signup and view all the answers

    If a car experiences no forces acting upon it while moving on a frictionless surface, what will happen according to Newton's first law?

    <p>The car will continue at a constant speed.</p> Signup and view all the answers

    What concept does Newton's first law illustrate about the motion of objects?

    <p><em>Objects tend to move in a straight line.</em></p> Signup and view all the answers

    In the absence of external forces, what happens to an object initially at rest?

    <p><em>It will remain stationary.</em></p> Signup and view all the answers

    What is the primary factor that allows for objects to maintain their state of motion according to Newton's first law?

    <p>Absence of unbalanced forces</p> Signup and view all the answers

    What is the formal expression of Newton's second law?

    <p>$F = ma$</p> Signup and view all the answers

    Why does pushing a car result in only modest acceleration compared to pushing a skateboard?

    <p>The car has more mass than a skateboard</p> Signup and view all the answers

    In Newton's third law of action and reaction, what is the nature of the forces between two objects?

    <p>Equal and opposite</p> Signup and view all the answers

    How do Newton's laws impact the design of vehicles and structures?

    <p>They help in understanding forces acting on objects</p> Signup and view all the answers

    What happens to a rocket's acceleration as its fuel burns during flight?

    <p>It increases due to a decrease in mass</p> Signup and view all the answers

    Which example best illustrates Newton's third law of action and reaction?

    <p>Launching a rocket into space</p> Signup and view all the answers

    What is the main implication of Newton's laws for understanding weather patterns and climate change?

    <p>They model forces in Earth's atmosphere and oceans</p> Signup and view all the answers

    How does Newton's third law elucidate the motion of a rocket during lift-off?

    <p>By showing how exhaust gases propel it upward</p> Signup and view all the answers

    Why is the concept of equilibrium important in various fields like engineering?

    <p>It ensures no net force acts on objects</p> Signup and view all the answers

    How does Newton's second law explain the acceleration differences between a car and a skateboard?

    <p>By linking acceleration to the forces acting on objects.</p> Signup and view all the answers

    Which fundamental concept states that for every action, there is an equal and opposite reaction?

    <p>Newton's Third Law</p> Signup and view all the answers

    Why does pushing a car require more force but results in less acceleration compared to pushing a skateboard?

    <p>The mass of the object affects its acceleration.</p> Signup and view all the answers

    In the context of rocket propulsion, why does a rocket's acceleration increase as its fuel burns?

    <p>Mass decreases, leading to a lower net force and higher acceleration.</p> Signup and view all the answers

    What phenomenon explains why passengers lurch forward in a car when it stops suddenly?

    <p>Theory of Inertia</p> Signup and view all the answers

    Which law quantitatively describes the relationship between net force, mass, and acceleration?

    <p>Newton's Second Law</p> Signup and view all the answers

    Why is the concept of equilibrium crucial in fields like engineering and architecture?

    <p>To ensure a balanced distribution of forces.</p> Signup and view all the answers

    'For every action, there is an equal and opposite reaction' is attributed to which law of motion?

    <p>Newton's Third Law</p> Signup and view all the answers

    'Mass times acceleration equals force' is a concise representation of which law of motion?

    <p>'Newton's Second Law'</p> Signup and view all the answers

    'An object at rest tends to stay at rest' is a simplified version of which law of motion?

    <p>'Newton's First Law'</p> Signup and view all the answers

    'Resistance to changes in state of motion' best describes which fundamental concept in physics?

    <p>'The Inertia Principle'</p> Signup and view all the answers

    Which statement best describes the concept of inertia as presented in Newton's first law?

    <p>Inertia highlights an object's resistance to changes in its state of motion.</p> Signup and view all the answers

    What fundamental principle does Newton's first law illustrate regarding the motion of objects?

    <p>Objects resist any change in their state of motion.</p> Signup and view all the answers

    What is the primary factor that allows objects to maintain their state of motion according to Newton's first law?

    <p>The absence of external unbalanced forces.</p> Signup and view all the answers

    How does Newton's first law differ in explaining the motion of objects compared to earlier beliefs?

    <p>Earlier theories proposed that objects need constant force to keep moving.</p> Signup and view all the answers

    Which scenario best exemplifies the practical application of Newton's first law?

    <p>A satellite orbiting Earth at a consistent speed in a vacuum.</p> Signup and view all the answers

    What does Newton's first law suggest about objects at rest?

    <p>Objects at rest remain stationary unless an external force acts on them.</p> Signup and view all the answers

    According to Newton's first law, what would happen if an object was set in motion on a frictionless surface?

    <p>The object would continue moving indefinitely without slowing down.</p> Signup and view all the answers

    What is the essence of Newton's first law regarding the motion of objects?

    <p>'Objects in motion tend to stay in motion' signifies inertia's impact on objects.</p> Signup and view all the answers

    How does Newton's first law contribute to understanding a spacecraft's perpetual motion in space?

    <p>'A spacecraft will continue moving indefinitely' aligns with Newton's first law concepts.</p> Signup and view all the answers

    'Without external forces acting upon it' references which critical aspect described by Newton's first law?

    <p>'Objects maintain their state of motion if no forces interfere.'</p> Signup and view all the answers

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