Competency 30 Physical Science

force

  • a push or pull on an object causing it to move, speed up, slow down, stop, or change direction
  • can be constant speed or accelerate
  • weight is also known as this

universal forces
gravitational, electrical, and magnetic are 3 types of…
gravitational

  • this force pulls any 2 objects toward one another
  • example would be: stopping a swing from swinging

weight

  • an object has this because the force of gravity pulls down on the object
  • a spring scale is used to measure this…

Newtons 1st Law

  • object at rest will remain at rest unless acted upon by force
  • object in motion will remain at the same speed and direction unless acted by an outside force
  • also known as inertia

gravity

  • a force that causes something to to move
  • it pulls objects down or
  • pulls 2 objects towards one another

electrical

  • this force pull or push forces that exists around charged particles
  • like charges will repel – positive/positive
  • unlike charges will attract – positive/negative

magnetic
this force attracts iron and steel
repel
north and north poles close together will
attract
north and south poles close together will…
work

  • the result of a force moving an object
  • more gravity, more force will result in more of this to move an object
  • less gravity, less force will result in less of this to move an object
  • it is what is needed to move an object

simple machines

their primary job is to make work easier

examples include: inclined plane, wedge, pulley, wheel and axle, lever, screw

constant
motion that does not change and is graphed with a straight line
friction

  • slows the motion of moving objects
  • produces heat energy like rubbing your hand together

kinetic energy

energy of motion or moving

examples:

  • pushing a toy car down a ramp
  • a child going down a slide

potential energy

stored energy such as a vehicle parked in the garage

other examples include:

  • a toy car on the top of a ramp
  • a book placed near the end of a table

kinetic energy

loss of height increases this type of energy

example: if a car on a ramp starts to roll, the car will begin to move faster

Newtons 3rd Law
for every action, there is an equal and opposite reaction
Newton’s 2nd Law
the greater the mass of the mass of the object being accelerated, the greater the amount of force is need to accelerate the object

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