IGCSE PHYSICS:VERIFIED QUESTIONS AND ANSWERS
What is the difference between speed and velocity
velocity has direction
what is the equation relating average speed, time taken and distance moved?
average speed=distance moved/time taken
what is acceleration?
how quick velocity is changing
what is the equation relating acceleration, change in velocity and time taken?
acceleration=change in velocity/time taken
on a distance-time graph what does the gradient symbolise?
speed
on a distance-time graph what does it mean when there's a flat section?
it's stopped
on a distance-time graph what does it mean when there are curves?
there's acceleration or deceleration
on a velocity-time graph what does the gradient symbolise?
acceleration
on a velocity-time graph what does it mean when there is a flat section?
steady speed
on a velocity-time graph how can you find distance travelled in a certain time?
by working out the area under the line (with limits if trying to find the distance travelled between
certain time)
what is weight caused by?
gravity
what is gravity?
the force of attraction between all masses
mass includes the force of gravity. true or false?
,false
give the equation relating weight, gravitational field strength and mass
weight=mass x gravitational field strength
what does friction do?
slows things down
what is the accelerating force that acts on all falling objects?
gravity
what is terminal velocity?
resistance force=accelerating force
what is newton's first law?
balanced forces means no change in velocity
what is newton's second law?
an unbalanced force means there will be acceleration
give the equation relating force, acceleration and mass
force=mass x acceleration
what is newton's third law? (use object A and object B)
that if object A exerts a force on object B, object B with exert the same but opposite force on
object A
what is a scalar quantity?
a quantity which has size
what is a vector quantity?
a quantity which has size and direction
which ones of these are vector quantities?
- mass
-force
-velocity
-temperature
-time
-distance
-displacement
, -acceleration
-momentum
force, velocity, displacement, acceleration, momentum
which ones of these are scalar quantities
- mass
-force
-velocity
-temperature
-time
-distance
-displacement
-acceleration
-momentum
mass, temperature, time, distance
what factors affect thinking distance?
speed, how dopey you are
what factors affect braking distance?
-speed
-mass of the vehicle
-quality of the breaks
-road surface
give the equation relating momentum, velocity and mass
momentum=mass x velocity
when is momentum conserved?
when no external forces act
what causes changes in momentum?
force
give the equation relating force acting, change in momentum and time taken for change to
happen
force acting=change in momentum/time taken for change to happen
how do crumple zones help decrease the impact of a crash on a passenger?
they increase the time for the car to stop
What is the difference between speed and velocity
velocity has direction
what is the equation relating average speed, time taken and distance moved?
average speed=distance moved/time taken
what is acceleration?
how quick velocity is changing
what is the equation relating acceleration, change in velocity and time taken?
acceleration=change in velocity/time taken
on a distance-time graph what does the gradient symbolise?
speed
on a distance-time graph what does it mean when there's a flat section?
it's stopped
on a distance-time graph what does it mean when there are curves?
there's acceleration or deceleration
on a velocity-time graph what does the gradient symbolise?
acceleration
on a velocity-time graph what does it mean when there is a flat section?
steady speed
on a velocity-time graph how can you find distance travelled in a certain time?
by working out the area under the line (with limits if trying to find the distance travelled between
certain time)
what is weight caused by?
gravity
what is gravity?
the force of attraction between all masses
mass includes the force of gravity. true or false?
,false
give the equation relating weight, gravitational field strength and mass
weight=mass x gravitational field strength
what does friction do?
slows things down
what is the accelerating force that acts on all falling objects?
gravity
what is terminal velocity?
resistance force=accelerating force
what is newton's first law?
balanced forces means no change in velocity
what is newton's second law?
an unbalanced force means there will be acceleration
give the equation relating force, acceleration and mass
force=mass x acceleration
what is newton's third law? (use object A and object B)
that if object A exerts a force on object B, object B with exert the same but opposite force on
object A
what is a scalar quantity?
a quantity which has size
what is a vector quantity?
a quantity which has size and direction
which ones of these are vector quantities?
- mass
-force
-velocity
-temperature
-time
-distance
-displacement
, -acceleration
-momentum
force, velocity, displacement, acceleration, momentum
which ones of these are scalar quantities
- mass
-force
-velocity
-temperature
-time
-distance
-displacement
-acceleration
-momentum
mass, temperature, time, distance
what factors affect thinking distance?
speed, how dopey you are
what factors affect braking distance?
-speed
-mass of the vehicle
-quality of the breaks
-road surface
give the equation relating momentum, velocity and mass
momentum=mass x velocity
when is momentum conserved?
when no external forces act
what causes changes in momentum?
force
give the equation relating force acting, change in momentum and time taken for change to
happen
force acting=change in momentum/time taken for change to happen
how do crumple zones help decrease the impact of a crash on a passenger?
they increase the time for the car to stop
