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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


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