Studied by 12 people
what’s the unit for force
Newton
how do forces appear
when two objects interact together
what is force
action of one body on a second body
what does unbalanced force cause
changes in speed, shape, direction
what is a newton
force required to give a mass of 1kg an acceleration of 1m/s²
what is air resistance
friction action on an object moving through air
what is friction
force that acts when two surfaces run over one another
what is drag
force that acts on an object as it moves a fluid
what is solid friction
resistance to motion caused when two surfaces are in contact
what is a good example of drag increasing thermal and kinetic energy
meteor
what happens when breaks in a car are applied
provides solid friction
what happens when standing still on concrete surface
solid friction impeding motion
will a driver need a higher or lower force to stop the car
higher
how can force be represented on paper
with arrows
what is weight
a force
what force acts on something that was dropped
gravity
what is the name given to the gravitational force acting on an object that has mass
weight
what is weight measured in
newtons
what is gravity
force that exists between any two objects with mass
what is weight
force exerted on an object due to gravity
what is 1kg in Newtons
9.8N
what pulls with a force of 9.8N per kg
gravity
why does every object near/on Earth have weight
caused by force of attraction from Earth’s gravity
which ball reaches the ground first? 1kg ball or 5kg ball
they will reach at the same time
why does every object fall at the same acceleration on the Earth’s surface
Earth pulls with the same force per kg
what is acceleration of free fall
acceleration of an object falling freely under gravity
what is acceleration due to gravity
acceleration of an object falling freely under gravity
what is 9.8m/s²
free fall
what symbol is given to free fall
g
what symbol is newtons
N
what do we need when calculating weight
mass and gravitational field strength
what is gravitational field strength
force exerted per unit mass placed at a point
which weight more? 5kg on moon, 5kg on earth
5kg on earth
which has more mass? 5kg on moon or 5kg on earth
both are the same
what is mass of an object
how much matter an object is composed of
what is weight of an object
gravitational force that acts on an object
how does weighing an object on a balance give its value
compares to standard weight on other side of balance
what is true about two objects weighting the same
same mass
what do parachutes make use of
air resistance
what increases with the speed of motion
air resistance
what is terminal velocity
the greatest speed reached by an object moving through a fluid
how do we know something has reached terminal velocity
it stopped accelerating
what happens when a person falls out a plane
accelerate downwards
what happens when a parachute is opened
air resistance increases
how does a parachute work
balances weight and air resistance slowing you down
why would you want to increase parachute area
to reach a slower terminal velocity
what would happen when your parachute area increases
air resistance increases
what does this graph show
terminal velocity
Note 
Flashcard (31)