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Week 12 - Speed (Grade 7 - Science)

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  • A motorcycle’s velocity at the topof thehill is11.0m/s.4.0 seconds later it reaches the bottom of the hill with a velocity of 20.0 m/s. What was the acceleration of the motorcycle?
    2.25m/s2
  • A force that inhibits or RESISTS THE MOTION of an object. It acts in a direction opposite of any motion
    ResistiveForce
  • What occurs when a SOLID OBJECT pushes its way through a LIQUID, such as water, or a gas, such as air.
    Fluid resistance
  • Analyse this graph
    The distance (m) STAYS THE SAME as the time(s) increases. • Therefore, the object is AT REST (not moving)
  • the distance an object travels per unit of time
    Speed
  • Analyse this graph
    The object is MOVING AWAY from the reference point • The object is moving at a CONSTANT SPEED • The object is MOVING QUICKLY
  • What are distance and displacement?
    Distance=180, Displacement=127
  • Fluid resistance can be....
    Air resistance, § Water resistance, § or resistance from other fluid material—even mud.
  • A push or a pull. Force is what causes motion.
    Force
  • a description of both speed and direction is called......
    Velocity
  • Analyse this graph
    In Part A, the object is moving away at a constant speed • In Part B, the object is at rest • In Part C, it is moving towards at constant speed
  • What does Positive Acceleration mean?
    Object speeds up
  • Analyse this graph
    The object is MOVING TOWARDS the reference point • The object is moving at a CONSTANT SPEED• The object is MOVING SLOWLY
  • When an object moves across a surface, it can encounter resistive force BETWEEN THE SURVICE that can SLOW DOWN and even STOP THE MOVE of the object.
    Friction
  • The tendency of things to keep traveling in the same direction at the same speed, unless something stops them.
    Inertia
  • What does Negative Acceleration mean?
    Object slows down
  • What measures HOW MUCH an object’s SPEED CHANGE over a certain time.
    Acceleration
  • what is Formula for acceleration?
  • How far an object moves in total is called..................
    Distance
  • The distance and direction of an object moves from a starting position.
    Displacement
  • Analyse the graph
    The distance(m) DECREASING as time (s) passes• The distance gets SMALLER AND SMALLER with each second• This shows(-) ACCELERATION
  • The measure of the speed and the direction of a specific object
    Velocity
  • Analyse the graph
    The distance(m) INCREASING as time(s) passes• The distance gets LARGER AND LARGER with each second• This shows(+) ACCELERATION
  • The space between two things.
    Distance
  • Drag force depends on:
    Shape of the object § Size of the object § Medium through which you move it § Speed of the object.
  • How fast something is moving
    Speed
  • A force that acts in an opposite direction to movement. The more friction something has, the harder it is to move.
    Friction
  • Analyse the graph
    The SPEED(m/s) is INCREASING as time(s)passes • The object speed is CHANGING• This shows(+) ACCELERATION
  • The force that attracts objects towards an other object. On earth, gravity pulls us towards the center of the earth.
    Gravity
  • Drag forces that slow down objects movement.
    Resistance
  • The act of something moving, a change in position.
    MOTION
  • Analyse the graph
    The SPEED(m/s) is CONSTANT as time(s) passes• The object’s SPEED is NOT CHANGING• This shows(0) ACCELERATION
  • What does Zero Acceleration mean?
    Constant or no speed
  • How to calculate speed?
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