Physics- forces

Cards (20)

  • What are 5 types of forces?
    Drag, magnetic field , tension, friction, weight
  • How do you determine distances over time on a graph?
    use the area under the graph
  • What does the gradient of a velocity time graph represent?
    acceleration
  • What is momentum?
    all moving object have momentum, when a unbalanced force acts on an object that is moving a change in momentum occurs
  • Explain why things like crash mats are used for gymnasts in terms of momentum?

    force= rate of change of momentum. these safety measures reduce the force by increasing the time over which the change of momentum takes place.
  • What is a moment?

    when a force causes an object to rotate about a pivot point. the turning affect is called a moment force.
  • What is the equation for acceleration?

    acceleration=change in velocity/time
  • Define inertia?

    The tendency of an object to continue in its stationary state or state of constant velocity
  • What is terminal velocity?

    an object will fall at a constant speed because the resultant force= 0
  • Explain terminal velocity of a skydiver?
    1)at first they accelerate due to there weight (force of gravity)
    2)as they speed up air resistance increases
    3)the resultant force reaches 0 and they fall at a const velocity (this is terminal velocity)
  • What is resultant force?
    when more than one force acts on an object, these forces can be seen as one force that has the same effect as all the forces acting together.
  • What is newtons 1st law?

    an object will remain in the same state of motion unless acted on by an external force
  • What is newtons 2nd law?
    when the resultant force is not equal to 0 an object may speed up, slow down or change direction. all of these class as acceleration. force is directly proportional to acceleration
  • What is Newtons 3rd law?
    for every action there is an opposite and equal reaction
  • Give the method for the extension experiment?
    1. set up clap stand with spring and masses attached
    2. measure the original length of the spring before extension with a ruler
    3. add 1N of weight and measure the extension of the spring
    4. repeat for masses 2N-6N
  • Give the variables for the extension experiment?
    independent: force acting on the spring
    dependent: extension
    control: original length of spring
  • Risk assessment for extension experiment?
    wear safety goggles incase spring recoils
  • What does the term inelastically deformed mean?

    if an object does not return to its original shape when a force has been applied
  • What is the difference between distance and displacement?
    Distance is a scalar, meaning it only has a magnitude. Displacement is a vector, meaning that it has both magnitude and direction
  • What is the relationship between acceleration and velocity?
    Acceleration is the rate of change of velocity over time.