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AQA Physics 9-1 Forces and their interactions

  1. What is a scalar quantity
    A quantity that has a magnitude (size) but no direction.
  2. What is a vector quantity?
    A quantity that has a magnitude (size) and a direction.
  3. Which of the following are vectors?
    - Displacement
    - Speed
    - Distance
    - Velocity
    - Acceleration
    - Temperature
    • Displacement
    • Velocity
    • Acceleration
  4. State the three effects forces can have on objects.
    • Change their:
    • - shape
    • - speed
    • - direction
  5. Name the three non-contact forces
    • electrostatic
    • magnetic
    • gravitational
  6. The weight of an object can be considered as acting through a single point. 

    What is this point called?
    Centre of mass
  7. Name the diagram showing all the forces acting on a single body.
    Free body diagram
  8. State the equation for calculating work done by a force
    • W = F s
    • (where s is the displacement in the direction of the force)
  9. What is meant by elastic deformation?
    When a body returns to its original size after a deforming force has been removed
  10. What does k represent in the equation 
    F = ke ?
    spring constant
  11. What is meant by the moment of a force?
    The turning effect of a force
  12. State the principle of moments
    When a body is in equilibrium, the sum of the anticlockwise moments = the sum of the clockwise moments
  13. What three things can gears do?
    • Change the :
    • direction of rotation
    • speed of rotation
    • force exerted
  14. When a force is applied to a hydraulic system, does the force or the pressure remain constant within the fluid?
    Pressure
  15. What is the equation for calculating pressure on a surface?
    Image Upload 1
  16. What is the unit of pressure?
    Pascal (Pa)
  17. In the equation 
    p = hρg
    what does ρ represent?
    The density of the fluid
  18. Name the upwards force acting on a body when submerged in a fluid
    Upthrust
  19. What causes upthrust?
    The difference in pressure between the bottom and top of the submerged part of the body
  20. When a body is submerged, what is the size of the upthrust provided by the fluid?
    Upthrust is equal to the weight of the displaced fluid.
  21. What happens to an object in water if its weight is greater than the upthrust?
    In sinks
  22. How does atmospheric pressure change as you go up a mountain?
    It reduces
  23. What causes atmospheric pressure?
    • When air particles collide with a surface they exert a force. 
    • The total force exerted is the sum of these forces.
    • Air pressure is the total force divided by the area on which the force is exerted.
Author
SilcoatesScience
ID
345362
Card Set
AQA Physics 9-1 Forces and their interactions
Description
AQA Physics 9-1 Forces
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