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Unit 3 Lesson 7. Force and Laws of Motion. S.8.C.3.1.1,2. The physics classroom website. Force. 1 N= 0.225lbs. A push or pull on an object. Can change the motion of an object Measured in Newtons (N) (kg*m/s 2 ) Friction and gravity are examples. Friction

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force and laws of motion

Unit 3

Lesson 7

Force and Laws of Motion


The physics classroom website


1 N= 0.225lbs

  • A push or pull on an object.
  • Can change the motion of an object
  • Measured in Newtons (N) (kg*m/s2)
  • Friction and gravity are examples.
  • Friction
  • A force that acts against motion.
  • Between objects that are touching
    • Between the legs of a desk and the floor when you push a desk
  • A force that pulls matter together
  • Between objects that are not touching
  • Isaac Newton
    • “the force of gravity acts between all objects in the universe”
  • Gravity exists between all matter
    • Gravity exists between you and your pencil however it is very weak
  • The more mass an object has, the stronger its gravity
  • Keeps objects in orbit around a star, planet or moon.
  • Makes objects “fall”
combining forces
Combining Forces

Force Diagrams:

  • We use arrows to show the different forces acting on objects
  • Direction of arrow shows the direction the force is acting
  • Length of the arrow shows the strength (size or magnitude) of the force
  • Net force: the combination of all forces acting on an object



= 10N









0 N

balanced forces
Balanced Forces
  • When two forces are the same strength (magnitude or size) but acting in opposite directions on a the same object.
  • Cannotchange an objects motion (speed and direction)
  • An object at rest to start with balanced forces will continueat rest
  • An object moving at 30 mph to the left with balanced forces acting on it will continue to move at 30 mph to the left
  • Forces are equal
  • Motion remains the same
    • If not moving, it continues to not move
    • If moving , it continues to move exactly the same

Balanced Forces

Forces on the person are balanced: Gravity pulls down on person, chair pushes up on person

10 N

10 N

unbalanced forces
Unbalanced Forces
  • Will change an objects motion (speed and direction)
  • A net force results.
  • Net force is calculated by adding forces in the same direction or subtracting forces in opposite directions
  • If an object is starting at restwhen a net force of 40 N  is applied, the object will move to the right
  • If an object is already moving to the right at a constant speed when a net forceof 40 N  is applied, the object will speed up.
  • Net force of 40 N to the Right
  • 40 N
  • New motion depends on the starting motion
newton s 1 st law of motion
Newton’s 1st Law of Motion

Law of Inertia

  • Object at rest will remain at rest
  • Object in motion will continue in motion in a straight line
  • The tendency of an object to resist a change in motion.
  • The higher the mass of an object , the higher its inertia is.

Unless an unbalanced force acts upon it

Circular motion animation

car making a sharp turn


Video Clip

Bill Nye- Inertia

newton s 2 nd law of motion
Newton’s 2nd Law of Motion
  • F = MA
  • The larger the net force on an object , the more the objects motion will change (greater acceleration).
  • Objects with larger masses, need more force to change their motion.
newton s 3 rd law of motion
Newton’s 3rd Law of Motion
  • When one object exerts a force on another object, the second object exerts an equal but opposite force on the first object
  • They are not balanced forces because the forces act on different objects

100 N

100 N

newton s 3 rd law
Newton’s 3rd Law
  • Action-Reaction
  • For every action (force), there is an equal but opposite reaction (force)

3 laws Video clip

Newton’s 3 Laws