forces Flashcards
what is a force
A force is a push or pull that acts on an object due to the interaction with another object.
what are contact forces
Push
Pull
Friction
Air resistance
Tension
what are non-contact forces
Gravitational force
Electrostatic force
Magnetic force
what is mass
tells us how much matter or substances something has
measured in kg
what is weight
is a force acting on an object due to gravity. This is caused by a gravitational field around the Earth.
scalar quantities
have magnitude but no direction
vector quantities
have magnitude and direction
examples of scalar quantities
temp
mass
energy
distance
speed
density
examples of vector quantities
displacement
velocity
acceleration
force
weight
momentum
what is work
another way of saying energy is transferred
what is the law of conservation
Energy cannot be created or destroyed.
Energy can only be transferred.
what does the term elasticity mean
is a property of an object which can be stretched, bent or compressed but it restores to it’s original shape.
what’s the independent variable
for the hooks law
required practical
forces
whats the dependent variable
for the hook and law
required practical
the extension of the spring
whats the control variable
for the hook and law
required practical
same spring
same ruler
what does deformation mean
change in shape
what is elastic deformation
is reversed when the force is removed.
inelastic deformation
cannot be reversed when the force is removed.
There is now a permanent change in shape.
what is speed
how fast something is going
velocity
how fast something is going in a specific direction
what is acceleration
measures how quickly something gets faster
declaration
velocity slowing down,decreseing
what is uniform acceleration
If an object’s speed (velocity) is increasing at a constant rate
newton’s first law of motion
Objects will stay at rest or in constant speed unless if the force is unbalanced.
newton’s second law of motion
resultant force = mass × acceleration
newtons third law of motion
For every action, there is an equal and opposite reaction
what is stopping distance
The total distance of thinking distance and the braking distance.
thinking distance
the distance a car travels whilst braking
Friction
One of forces the road exerts on the tyres as the car is stopping.
human factors that cause crashes
tiredness
alcohol and drugs
speeding
car/road factors that cause car crashes
poor visibility
wet/icy roads
car broken
what is momentum
strength or force of a moving object, due to the object’s mass and velocity.
