Forces

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Forces

  1. 1. Example of push forces Example of pull forces Examples of push and pull forces-____________ something - ________ something from the ground - ____________ force- ___________ something (eg,abutton) - ______________ force - ____________ force- ___________ something - _____________something (eg rubber band)
  2. 2. Do youthink a force has direction? It does, force is a ___________ quantity, which has both _____________ and _______________! Newton’s first law states that “Every bodycontinues in a state of rest or uniform velocity in a straight line,unless anexternal force acts on it.”So a force can do what?  Force can make a ______________ object move.  Force can also change the ______________ of an object where it could mean changing the amountor the direction! (velocity refers to speed with a direction) What We Experience How It Fits Together How We Explain It Newtons First Law Newtons First Law Newtons First Law- Books sitting on a bookshelf (no - The things that are - Objects at rest tend tomotion, no force) stationary need _____________, while something to make them objects in motion will stay in- A car sitting in a parking lot (no move. _____________________ atmotion, no force) a ________________ (unless - The things that are a force changes that speed or- A frisbee flying through the air moving need something direction)(moving, but no accelerating force, until to get them to stop.it is caught)Magnetic forceA magnetic substance is a substance that displays magnetic propertiesEvery natural magnet has both a ________ pole and ___________ poleLike poles of magnets _________ while unlike poles ___________Magnetic materialsThe elements Nickel, Cobalt and ________________ is an alloy of iron and has magnetic properties too!Gravitational ForceAnything in the universe that has mass would have a ______________________ to everyother mass. The larger the mass an object has, the stronger its ability to attract other objectsbecome.Earth’s gravitational force pulls objects ____________________ of the planet.
  3. 3. the equation used to calculate the pull of Earth on objects is_____________where F is the force in newtonsm is the mass of the object in kgand g is the _______________________________, which on earth is 10N/kgElectrical forceObjects carrying electrical charges (positive and negative) exert an electrostatic force on othercharged objects.Like charges will experience repulsion, while unlike charges experience electrostaticattractionFriction opposes the movement between one surface across another surface by working inopposite direction from the direction of the movement. Friction is increased when 1) surfaces are ____________ 2) the _____________________________________ is large (for example, a book’s weight affect the force felt between the book surface and table surface)

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