QA Preparation [Incomplete]

• What does the law of inertia state?

  An object will continue in its state of rest or motion unless acted upon by an external force.
• What is inertia?

  Inertia is the tendency of an object to resist a change in its state of motion.
• What is required to get an object moving or to stop a moving object?

  A net force needs to be acting on the object.
• What does a free-body diagram represent?

  A free-body diagram shows the magnitude and direction of forces acting on an object.
• What happens when forces of the same magnitude point in opposite directions?

  They will cancel each other out.
• How does the force required for a given acceleration relate to inertia?

  The force required is directly proportional to the inertia of the object.
• What is mass?

  Mass is a constant scalar measurement of an object's quantity or magnitude.
• What is weight?

  Weight is the force produced when mass is present in a gravitational field.
• What is the formula for calculating net force?

  F = ma
• What do the variables in the formula F = ma represent?

  F is net force in N, m is mass in kg, and a is acceleration in m/s².
• How is acceleration related to net force and mass?

  Acceleration is directly proportional to net force and inversely proportional to mass.
• What is the relationship between mass and inertia?

  An object with a larger mass has higher inertia.
• What does the law of acceleration state?

  The acceleration of an object is directly related to the force applied and inversely related to its mass.
• What is acceleration?

  Acceleration is the rate of change of velocity with respect to time.
• What is the formula for acceleration?

  a = (v - u) / t
• What does it mean if an object's velocity is increasing?

  It has a positive acceleration in the direction of velocity.
• What does it mean if an object's velocity is decreasing?

  It has negative acceleration in the opposite direction of velocity.
• What does it mean if an object's velocity is uniform?

  It means the acceleration is 0.
• What is friction?

  Friction is the resistance that opposes motion and tends to keep an object at rest.
• What is static friction?

  Static friction is the frictional force when all objects are stationary relative to an external observer.
• What is kinetic friction?

  Kinetic friction is the frictional force when an object is in motion due to an external unbalanced force.
• What are the two types of friction?

  • Static friction: frictional force when at rest
  • Kinetic friction: frictional force when in motion
• What is work in physics?

  Work is the product of applied force and distance moved in the direction of the force.
• What is the formula for work?

  W = Fd cos θ
• What conditions must be met for work to be classified as such?

  Something must move in the same direction as the force applied.
• What is mechanical work?

  Mechanical work is the product of a force and the distance it moves.
• What is mechanical advantage?

  Mechanical advantage is the force or distance advantage gained by using a machine.
• What are the conditions for positive, negative, and no work?

  • Positive work: force & direction are in the same direction
  • Negative work: force & direction are in opposite directions
  • No work: force & direction are perpendicular
• What is energy in physics?

  Energy is the ability to do work.
• What is potential energy?

  Potential energy is energy an object has due to its position, or stored energy.
• What is the formula for potential energy?

  PE = mgh
• What is kinetic energy?

  Kinetic energy is energy in motion.
• What is the formula for momentum?

  P = mv
• What factors affect momentum?

  Mass, velocity, and direction affect momentum.
• What is the law of conservation of momentum?

  The law of conservation of momentum states that momentum is a conserved quantity.
• What is impulse in physics?

  Impulse is the change in momentum of an object.
• What is the formula for impulse?

  Impulse = change in momentum
• What are the key concepts of momentum, impulse, and collision?

  • Momentum: P = mv
  • Impulse: change in momentum
  • Law of conservation of momentum: momentum is conserved