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Newton's Second Law and Related Concepts - Physics with Calculus

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이 집합의 용어 (21)

  • What causes acceleration according to Newton's second law?
    Acceleration is directly proportional to the net force acting on an object.
  • How does friction depend on materials?
    Friction depends on the kinds of material and how much they are pressed together, caused by surface bumps and atomic stickiness.
  • When pushing an object at constant speed, how does friction compare to the push force?
    The force of friction is equal in magnitude and opposite in direction to the push force.
  • What happens to friction force when an object is pushed with increasing speed?
    The friction force is less than the push force, resulting in a net force and acceleration.
  • Define mass in physics terms.
    Mass is the quantity of matter in an object and a measure of its inertia, independent of gravity.
  • Define weight in physics terms.
    Weight is the force on an object due to gravity, measured in newtons (N).
  • How are mass and weight related?
    Weight is directly proportional to mass and depends on the gravitational field strength.
  • What is the weight of 1 kilogram on Earth's surface?
    1 kilogram weighs approximately 9.8 newtons on Earth's surface.
  • What does the breaking of the top string when pulled slowly illustrate?
    It illustrates the weight of the ball, as the top string supports both the ball's weight and the tension from the bottom string.
  • What does the breaking of the bottom string when pulled quickly illustrate?
    It illustrates the mass of the ball, showing inertia resisting sudden motion.
  • How does acceleration change when the same force is applied to double the mass?
    Acceleration is halved because it is inversely proportional to mass.
  • State Newton's second law of motion in words.
    Acceleration is directly proportional to net force, in the direction of the net force, and inversely proportional to mass.
  • Write Newton's second law formula.
    Acceleration = net force divided by mass, \(a=\frac{F_{net}}{m}\).
  • What happens to acceleration if the net force doubles and mass remains constant?
    Acceleration doubles.
  • What happens to acceleration if the mass halves and net force remains constant?
    Acceleration doubles.
  • Why do objects of different masses fall with the same acceleration in free fall?
    Because the greater force on the heavier object is exactly balanced by its greater mass, resulting in the same acceleration \(g\).
  • What is terminal velocity?
    Terminal velocity is the constant velocity reached when air resistance balances the weight, resulting in zero net force and zero acceleration.
  • How does air resistance change as a skydiver falls faster?
    Air resistance increases as the skydiver's speed increases.
  • What happens to net force and acceleration as a skydiver approaches terminal velocity?
    Net force and acceleration decrease to zero.
  • Who reaches the ground first when a heavy and light person jump with same-size parachutes?
    The heavy person reaches the ground first due to a greater terminal velocity.
  • What happens to falling objects in a vacuum where there is no air resistance?
    All objects fall at the same rate and hit the ground simultaneously regardless of mass or shape.