forces

• what is a force?

  a push or pull that acts on an object,due to its interaction with another object
• force has?

  magnitude and direction
• what is a contact force?

  where the two objects are physically touching
• examples of contact force?

  friction

  tension

  air resistance
• what is non-contact force?

  don't require the objects to be touching
• examples of non contact force?

  gravitational

  magnetic

  electrostatic

  field of influence(can be attractive or repulsive)
• what is scalar quantity?


  only have a magnitude
• examples of scalar?


  distance

  mass

  temperature

  time
• what is a vector quantity?

  have both magnitude and direction
• examples of vector quantity?

  velocity

  displacement

  acceleration

  force

  momentum
• what is a resultant force?

  overall force acting on an object
• what is elastic deformation?


  when an object turns back into its original state
• what is inelastic deformation?

  when the spring doesn't stay back in it's normal shape,and is a little deformed
• extension

  increase in length of a spring,when it is stretched.

  measure how the spring length changes
• what happens to the spring and extension increases?

  as we increase the force on a spring,extension increases proportionally(depending on the spring constant)
• force and extension relation

  force is directly proportional to the extension
• gears!

  -transmit turning effects

  -gear system allows the turning effect of the engine to be transmitted to the wheels.

  -gears turn in opposite direction
• radius of gear B and gear A

  gear B is 2x than gear A
• turning point of gear B and gear A

  turning point of gear B is also 2x bigger
• what is moment

  rational or turning effect of a force.
• equation linked with moment,force,distance

  (Nm)moment=force x distance
• rule of clockwise and anti-clockwise moment

  total anti-clockwise moment=total clockwise moment
• equation linked with weight,mass,gravitational field strength

  weight=mass x gravitational strength
• leavers!

  leaver-transmit a turning effect of a force
• how levers works?

  -an input force is added and as a result as output force is used.

  -if the input force and output force are on different sides of the pivot

  -then they act in different directions

  -same side of the pivot(both act in the same direction)

  -there will be a larger force,because the output force is closer to the pivot,than the input force
• what is acceleration?

  rate of change of velocity
• speed

  scalar quantity
• velocity


  vector quantity
• what are gases that are apart of the atmosphere?

  carbon dioxide

  nitrogen

  oxygen
• atmospheric pressure is

  lower at a higher elevation
• what is weight?


  cause an object total towards the earth
• size of air resistance?

  depends on the object's size, shape, and speed.
• terminal velocity

  terminal velocity is reached the resultant force=0
• the weight,magntiude,air resistance?

  the weight has the same magnitude as the air resistance
• what is pressure?

  force per unit of area
• what is fluid/pressure?

  happens in gas/liquids
• what is upthrust?

  why some objects float instead of sink
• upthrust

  surroundings will exert forces onto the object

  upthrust is the resultant force upwards

  pressure on the bottom of the object being greater than pressure on top of the object
• equation linked with pressure,force,area

  pressure=force/area
• equation linked with momentum,mass,velocity?

  momentum=mass x velocity