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what is the parallelogram of forces? - ANSWERS-scale diagram of two force vectors
used to find the resultant fore of the two when they are not parallel
resultant is the diagonal of the parallelogram
how do you measure resultant displacement? - ANSWERS-measured using ruler on a
scalar diagram or calculated with pythagoras
what is resolution of forces? - ANSWERS-means finding perpendicular components that
have resultant force that is equal to the force
drawing two forces at right angles is to represent single resultant force
what is a moment of a force increased by? - ANSWERS-increasing size of the force
using spanner with a longer handle
a small force over a large distance can produce the same moment as a large force with
a small distance
What is the conservation of momentum? - ANSWERS-In a closed system, the total
momentum before an event is the same as after the event
,What is Newton's second law? - ANSWERS-The acceleration of an object is directly
proportional to the resultant force acting on the object, and inversely proportional to the
mass of the object.
can be investigated using a trolley with constant mass, newton meter, motion sensor
and computer
what is effect force? - ANSWERS-the greater the resultant force on an object and the
greater the objects acceleration
what is effect mass? - ANSWERS-the greater the mass of an object the smaller the
acceleration
for a given force
what is the unit for moment? - ANSWERS-Nm
what is a lever used for? - ANSWERS-make it easier for us to do work
increase distance from pivot at which the force is applied
act as force multipliers as less force required to get the same moment by increasing
distance
what are gears? - ANSWERS-like levers because they multiply effect of a turning force
what do you want if you want to increase moment of turning force? - ANSWERS-need a
small gear to drive large gear wheel
when car is in ow gear a small gear wheel (effort) turns a large gear wheel (load)
load force larger than effort force hence acting as a force multiplier
what happens when you change from low gear to high gear? - ANSWERS-low gear
ratio gives low speed and high turning effect
high gear gives high speed high speed and low turning effect
, what happens when an object at rest doesn't turn? - ANSWERS-sum of anticlockwise
moments = sum of clockwise moments at any point
this is principle of moments
what is distance? - ANSWERS-how much ground an object has covered
what is displacement? - ANSWERS-distance in a given direction
what is magnitude? - ANSWERS-the value of force in newtons
what is friction? - ANSWERS-A force that opposes motion
what is a scalar? - ANSWERS-A quantity with only magnitude
what is a vector? - ANSWERS-a quantity that has both magnitude and direction
what is a contact force? - ANSWERS-When two objects have to be touching for a force
to act
What are balanced forces? - ANSWERS-when forces are equal and opposite to each
other also known as equilibrium
what is weight? - ANSWERS-the force of gravity on an object
what is centre of mass? - ANSWERS-The point at which the mass of the object may be
thought to be concentrated
what is resultant force? - ANSWERS-The overall force on a point or object
what is work done? - ANSWERS-when an object is moved through a distance