Physics

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Created by
Sultan Alogaily

Subdecks (3)

Cards (94)

  • Which of the following energy forms is associated with an object in motion?
    Kinetic Energy
  • In which of the following sentences is work used in the everyday sense of the word? 
    Sam and Rachel worked hard pushing the car.
  • A force does work on an object if a component of the force...
    is parallel to the displacement of the object.
  • Work is done when...
    the displacement is not zero.
  • If the sign of work is negative,

    the displacement is in the direction opposite the force.
  • In which of the following scenarios is work done?
    A car decelerates while traveling on a flat stretch of road.
  • In which of the following scenarios is no net work done?
    A car travels at constant speed on a flat road.
  • A child moving at constant velocity carries a 2 N ice-cream cone 1 m across a level surface. What is the net work done on the ice-cream cone?
    0 J
  • A worker does 25 J of work lifting a bucket, then sets the bucket back down in the same place. What is the total net work done on the bucket?
    0 J
  • A construction worker pushes a wheelbarrow 5.0 m with a horizontal force of 50.0 N. How much work is done by the worker on the wheelbarrow?
    250 J
  • A horizontal force of 200 N is applied to move a 55 kg television set across a 10 m level surface. What is the work done by the 200 N force on the television set?
    2000 J
  • A child pulls a balloon for 12 m with a force of 1.0 N at an angle 60° below horizontal. How much work does the child do on the balloon?
    6.0 J
  • Which of the following energy forms is associated with an object in motion?
    Kinetic Energy.
  • Which of the following energy forms is associated with an object due to its position?
    Potential Energy.
  • Which of the following energy forms is not involved in hitting a tennis ball?
    Chemical potential energy.
  • Ball A has triple the mass and speed of ball B. What is the ratio of the kinetic energy of ball A to ball B.
    27
  • What is the kinetic energy of a 0.135 kg baseball thrown at 40.0 m/s?
    108 J
  • If friction is the only force acting on an object during a given physical process, which of the following assumptions can be made in regard to the object’s kinetic energy?
    The kinetic energy decreases.
  • The main difference between kinetic energy and potential energy is that...
    kinetic energy involves motion, and potential energy involves position.
  • Friction converts kinetic energy to...
    nonmechanical energy
  • Which of the following is the rate at which energy is transferred?
    Power.
  • Which of the following is the rate at which work is done?
    Power.
  • Which of the following are not units of power?
    J
  • How much power is required to lift a 2.0 kg mass at a speed of 2.0 m/s?
    39 J
  • What is the average power supplied by a 60.0 kg person running up a flight of stairs a vertical distance of 4.0 m in 4.2 s?
    560 W
  • Which of the following has the greatest power output?
    A crane that lifts a 25,000 N beam at a speed of 1.2 m/s.
  • A more powerful motor can do...

    the same work in a shorter time interval.
  • The main difference between kinetic energy and potential energy is that...

    kinetic energy involves motion, and potential energy involves position.
  • Which form of energy is involved in weighing fruit on a spring scale?

    Elastic potential energy.
  • Gravitational potential energy is always measured in relation to...
    a zero level.
  • The equation for determining gravitational potential energy is PE = mgh. Which factor(s) in this equation is (are) not intrinsic to an object?

    Both (g) and (h).
  • Which of the following parameters does not depend on how resistant a spring is to being compressed or stretched?
    Relaxed Length
  • If the displacement of a horizontal mass-spring system was doubled, the elastic potential energy in the system would change by a factor of...
    4.
  • If the mass in a horizontal mass-spring system was doubled, the elastic potential energy in the system would change by a factor of...
    0 (no change).
  • What is the potential energy of a 1.0 kg mass 1.0 m above the ground?
    9.8 J.
  • How much elastic potential energy is stored in a bungee cord with a spring constant of 10.0 N/m when the cord is stretched 2.00 m?
    20.0 J
  • Which of the following is a true statement about the conservation of energy?

    Total energy is always conserved.
  • In the presence of frictional force,
    nonmechanical energy is no longer negligible and mechanical energy is no longer conserved.
  • Why doesn’t the principle of mechanical energy conservation hold in situations when frictional forces are present?

    Kinetic energy is not completely converted to a form of potential energy.
  • For which of the following situations is the conservation of mechanical energy most likely to be a valid assumption?
    A soccer ball flies through the air.