hiii
some are called fundamental
1 electro 2 week inereaction 3 strong inereaction 4 orauiation
what are two thing the determine gravitational forces
1 the masses of the objects 2 the distance between objects
a 100-n bag of nails hangs motionless from a vertical strand of rope. how much force dose the rope pull up with
50
what is friction
A force that opposes motion
what is a force
A push or a pull
what are examples of forces
A push, a pull, an interaction of an object with its environment
What is net force?
The combination of all forces acting on an object
What causes friction
When the surfaces of two objects rub against each other.
what is a lubrancant
a substance (such as grease) capable of reducing friction, heat, and wear when introduced as a film between solid surfaces
when dose a lubricant reduce the amount of friction
chang the conditions of rubbing, replacing the sliding friction by rolling friction.
what are some ways to make friction greater or weaker
change the surface change now hard the surface are presed together
what are the two properteis do all force have
direction and size
contact vs non-contact forces
force in direct contact (touching) vs. not touching (gravity)
what are three forces acting on a bicycle
gravity, ground, friction,
how is mass difrent from weight
how is mass difrent from weight
what are trwo thing you can do to increse the friction between the two objects
increseing the force
what is griavty
is a force of atttraction or
what would happen to an object that have an unbalenced force acting on it
it will move or change direction
what is the key word in forces
newtons
what units is friction measured
newtons f y=mx un
what direction is friction in
opsite the direction of motion
what are some exsamples or types of friction
static friction, sliding friction, rolling friction, and fluid friction
what are types of friction
static, sliding, rolling, fluid
What is the law of universal gravitation?
the force of gravity acts between all objects in the universe
what determines the graviational force between objects
the mas of dirent objects
why cant you see two soccer balls attracting eachouter
the mass are two small
what would happen if both dogs pulled the rope with a force of 85 N
the rope will stay still
what happens to the motion of an object if the net forces acting in it's 0 n
ts speed and direction of motion remain unchanged
when dose static friction become kniectic friction
when enugh force pulls at it
if there are many forces acting on an object, how can the net forces be 0
when the forces are equal, cancelling each other out
