Chem/Phys · 4A

Motion, forces, and energy

Content category 4A. 33 questions in 7 sets, each with reasoning for every answer choice.

Set 1 · Circular motion

  1. Net force on a car rounding a curvemedium
  2. Centripetal force on a carmedium
  3. Minimum speed at the top of a loophard
  4. Maximum speed on a flat curvehard
  5. Torque balance on a seesaweasy

Set 2 · Forces

  1. Newton's second law with kinetic frictioneasy
  2. Acceleration down a frictionless inclinemedium
  3. Apparent weight in an accelerating elevatormedium
  4. Gravitational force when distance tripleseasy
  5. Weight at an altitude of one Earth radiusmedium

Set 3 · Kinematics

  1. Projectile acceleration at the top of its patheasy
  2. Final velocity with constant accelerationeasy
  3. Horizontal projectile: how far does it land?medium
  4. Free fall: distance fallenmedium
  5. Braking: finding decelerationmedium

Set 4 · Momentum

  1. Distance traveled while acceleratingmedium
  2. Complementary launch angleshard
  3. Perfectly inelastic collisioneasy
  4. Average force from impulseeasy
  5. Elastic collision between equal massesmedium

Set 5 · Momentum

  1. Impulse and airbagsmedium
  2. Recoil and conservation of momentumhard
  3. Is the collision elastic?hard
  4. Calculating a pendulum's periodeasy
  5. Pendulum period and massmedium

Set 6 · Work and energy

  1. Pendulum length and periodmedium
  2. Torque at an anglehard
  3. Conservation of energy on a frictionless rampeasy
  4. Kinetic energy when speed doubleseasy
  5. Work done by frictionmedium

Set 7 · Work and energy

  1. Power to lift a loadmedium
  2. Elastic potential energy of a springmedium
  3. Energy lost to friction on a ramphard