forces Flashcards
force
a push or pull on an object
velocity
the rate of change of the position of an object
constant velocity
same speed and direction
what causes velocity to change
acceleration
compression
a force which acts to deform or change the shape of an object
tension
2 forces acting on an object in opposite directions away from each other
newtons 1st law
objects will remain at rest or in motion unless acted upon by an external unbalanced force
newtons 2nd law
F (N) = mass(kg) x acceleration(m/s)
newtons 3rd law
for every force object A exerts on object B, object B will exert an equal force but in the opposite direction to object A
contact forces
objects are in contact with each other and exert forces on each other
friction
opposes motion
always acts in opposite direction to motion
slows/stops an object in motion
normal force
acts perpendicularly to the surface the object is on
equal to weight force
non contact forces
objects that are not in contact and exert forces on each other(act over a distance)
examples of non contact forces
gravitational
magnetic
electrostatic
another name for push/pull
repulsion/attraction
gravitational force
the force exerted on objects with a mass
- cause objects to fall towards the earth
where does the gravitational force exist
between two objects with mass(forces of attraction)
what affects gravitational force
mass
distance between two objects
mass
the amount of matter in an object
what is the formula for weight
fg= m x 9,8
does mass change on different planets
no it stays constant
what is the unit for weight
newtons
weight
the gravitational force exerted on objects
magnetic forces
a non contact force experienced by objects which contain iron, nickel, cobalt
alloys
any material including iron, nickel, cobalt
like poles
repel
opposite poles
attract
