Physics Practice Problems Notes

Galileo's Demonstration at the Leaning Tower of Pisa

• Confirmed or refuted Aristotle's teachings on motion.
  • A) Confirmed Aristotle's teachings.
  • B) Refuted Aristotle's teachings.
  • C) Failed in their purpose.
  • D) None of the above.

Concept of Inertia

• Inertia defined by Galileo as
  • A) Force like any other force.
  • B) Special kind of force.
  • C) Property of all matter.
  • D) Concept opposite to force.

Understanding Mass and Inertia

• Comparing blocks of solid iron:
  • A 1-kg block of solid iron compared to a 2-kg block has
  • A) Twice the inertia.
  • B) Twice the mass.
  • C) Twice the volume.
  • D) All of the above.
  • E) None of the above.

Weight vs Mass

• Your weight is defined as:
  • A) Another word for your mass.
  • B) The gravitational attraction between you and Earth.
  • C) A property of mechanical equilibrium.
  • D) The same in all locations.
• A typical 1-kg mass at Earth's surface weighs about:
  • A) 1 N.
  • B) 5 N.
  • C) 10 N.
  • D) 12 N.

Mass of Gold Depending on Location

• The largest mass of gold weighs 1 N on:
  • A) The Moon.
  • B) Earth.

Net Force Calculations

• An object is pulled by two forces: 10 N northward and 15 N southward. Net force magnitude is:
  • A) 0 N.
  • B) 5 N.
  • C) 10 N.
  • D) 15 N.
• A 50-N object in air experiences 30 N of air resistance. The net force is:
  • A) 0 N.
  • B) 20 N.
  • C) 50 N.

Zero Acceleration Scenarios

• Scenarios with zero acceleration include:
  • A) An object at rest.
  • B) An object moving at constant velocity.
  • C) An object in mechanical equilibrium.
  • D) All of the above.

Forces Acting on a Standing Person

• When standing on a floor, the vertical forces acting on you are:
  • A) Zero.
  • B) One.
  • C) Two.

Force of Friction

• If friction on a sliding object is 10 N, the applied force to maintain constant velocity is:
  • A) More than 10 N.
  • B) Less than 10 N.
  • C) 10 N.
• When pushing a crate at constant speed, friction is:
  • A) Less than the pushing force.
  • B) The same as the pushing force.
  • C) More than the pushing force.

Average Speed Calculation

• Nellie's average running speed after running 100 yards in 20 seconds is:
  • A) 1/2 yard/s.
  • B) 5 yards/s.
  • C) 50 yards/s.

Acceleration of a Rolling Ball

• A ball rolling down an inclined plane gains speed by:
  • A) 4 m/s each second leads to an acceleration of:
  • A) One half of 4 m/s.
  • B) One half of 4 m/s².
  • C) 4 m/s².
  • D) 10 m/s².

Free Fall Speed Calculation

• After 2 seconds of free fall from rest, an object's speed is:
  • A) 5 m/s.
  • B) 10 m/s.
  • C) 15 m/s.