velocity + acceleration

• what is speed?

  the amount of time it takes to cover a distance in m/s.
• what is velocity?

  speed in a given direction.
• what is the formula for acceleration?

  change in velocity/time = final velocity - initial velocity/time
• what is acceleration?

  the acceleration of an object is the rate of charge of velocity.
• what is deceleration?

  when an object slows down, it is deceleration meaning it has a negative acceleration.
• what is a scalar quantity?

  a physical quantity described only by its magnitude (size).
• what is a vector quantity?

  a quantity that has both magnitude (size) and direction.
• on a velocity-time graph, the acceleration is the gradient of the line.
• define weight?

  the force of gravity on an object.
• what is weight measured in?

  newtons.
• define mass.

  the quantity of matter an object has.
• what is mass measured in?

  kilograms
• what is terminal velocity?

  if an object falls in a fluid (air), a resistive force acts on the object.
• what happens to the drag force when an object falls in relation to terminal velocity?

  the drag force will INCREASE with the speed of the object.
• what is the equation for resultant force?

  resultant force =weight - drag force
• what is the conservation of momentum?

  when two objects collide, the total momentum before the collision equals the total momentum after the collision.
• what is the equation for momentum?

  momentum = mass x velocity or p = m x v
• what is momentum?

  the momentum of an object is the product of its mass and velocity. it is a vector as it has magnitude (size) and direction.
• when drag force = weight - the object will fall at a constant velocity. (it cant go any faster)
• what causes air resistance?

  difference in pressure.
• force = mass x acceleration
• weight = mass x gravitational field strength. or w = mg