Physics paper 2

• Why does a crisp back inflate in a plane

  Pressure smaller in cabin so pressure in bag is higher than outside of bag so more force pushing outwards
• Relationship between height and air pressure

  Decreases as altitude increases
• Where in a container of a liquid is pressure the highest

  The bottom
• On an object in water, where is the most pressure

  On the bottom of object
• What happens if upfrust is smaller than objects weight

  Object sinks
• What is a moment

  Rotational or turning effect of a force
• What does a moment turn around

  A central point (pivot)
• How do you get a bigger force of a moment

  Apply larger force further away from pivot
• Why could holding a spanner diagonally cause a lower moment

  There would be a smaller perpendicular distance
• When is a seesaw stationary

  When clockwise and anticlockwise moment is the same
• Where is the pivot on seesaw

  The middle
• What is a leavers function

  To transmit the turning effect of a force
• What does a leaver provide

  An input force and and output force somewhere else
• What happnes if both input and output forces are on opposite sides of pivot

  There force direction would be opposite
• On a leaver which force is stronger

  Output force
• What is the function of a gear

  To transmit the turning effects
• How could you double the turning effect of a gear compared to other gear

  Make the radius of gear double the size of the other gear
• How does a gear system of a car work (basic)

  Gear system in engine allows tuning effect of engine to be transmitted to the wheels
• How radio waves produce a signal in a car

  Arial absorbs radio waves. This causes electrons to vibrate in the ariel which creates an alternate current