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Gravity
Terms in this set (25)
a push, pull or twist
Describe a force
newton meter
How do you measure a force?
The amount of matter
Define Mass
a force on an object
Define Weight
top pan balance
How would you measure mass?
newton meter
How would you measure weight?
the amount of gravity acting on an object
define gravitational feild strength
10N per kg
what is the value of g on earth?
Mars
Which planet has a smaller g then earth?
Neptune
which planet has a larger g than earth?
w=10N/kg
weight equation
w=mg
weight equation
m=w/g
mass and weight equation with m first
g=w/m
mass and weight equation with g first
1. accelerate
2. deccelerate
3. change direction
how could the motion change with a resultant force on balanced forces
an object will remain in a state of rest or uniform motion unless it is acted upon by an unbalanced force
newtons first law
The opposite direction to the way the body is moving
when a body slides over a surface which direction does friction act
1. large surface area
2. rough surface
what two factors increase the size of friction
1. unwanted heat
2. wears down tyres
3. slows it down
how is friction a neusance in machines?
1. lubricants
2. small surface area
3. smooth surface
how can friction be reduced?
1. grip on tyres
2. walking without slipping
friction being useful
water resistance
water drag force
air resistance
air drag force
drag forces increase with spead and friction doesn't
it what ways does friction differ from drag forces?
1. streamlining
2. polished
state two ways in which drag forces can be reduced
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