Chapter 9 Forces Flashcards
what is a force
a push or pull that one object exert on another
what is the SI unit of force
newton (N)
name the contact forces
normal reaction force , friction force , and elastic force
name the non-contact forces
gravitational force and magnetic force
define gravitational force
it is a pulling force between two objects due to their masses. the more mass an object has , the stronger the force.
the greater the ____ the greater the gravitational force
mass
as the distance gets further the gravitational force _________
decreases
define elastic force
it is a pulling or pushing force found in stretched/ compressed springs and elastic materials such as rubber bands.
define normal reaction force
it is a pushing force that occurs when an object is physically in contact with another surface
tension acts on the _____ __ _______ where the strings meet the object and is directed _____ ___ ______
point of contact , along the string
define weight
it is the amount of gravitational force acting on an object
define mass
it is the amount of matter in an object
does weight change ?
yes it changes with location
SI unit of weight
newton (N)
SI unit of mass
kilogram (KG)
what do you use to measure weight
spring balance
define gravitational field strength
it is defined as the force experienced per unit mass by a small test mass at a point in gravitational field
what do you use to measure mass
beam balance
how do u find weight
weight = mass x gravitational field strength
define pressure
it is defined as the force acting per unit area
what is energy
energy is the ability to do work
what is the SI unit of pressure
N/m^2 also known as the pascal (Pa)
what is the SI unit of energy
joule (J)
name common forms of energy
kinetic energy , chemical potential energy , elastic potential energy , gravitational potential energy , thermal energy , and sound energy
how do u find gravitational potential energy
GPE = mass x gravity x height
how do u find work done
force x distance (m) = work done
smaller area of contact = ____ __ _____ ____ ________
able to exert more pressure
