Warm Up - Create a Picture in your IAN for Each of the Statements Below. Must use AT LEAST 4 Colors! WILL BE GRADED! An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. For every action, there is an equal and opposite reaction.

Newton’s Laws of Motion

Regarding Motion, Newton says: “In order to move an object with mass, you need to apply a force” The greater the mass = The greater inertia => more force is needed

Force – push or pull and causes things to accelerate 1000 kg Force

Balanced vs. Unbalanced Forces Balanced Forces - no acceleration in any direction Unbalanced Forces – one force is greater than the other causing acceleration in a direction

Balanced Forces 5 N Equal Pushing Object Forces will cancel each other and produce NO ACCELERATION!

Balanced Forces If these football players push on each other equally as hard, will either one move?

Balanced Forces Gravity pulls down on you, the ground pushes back up, KEEPING YOU WHERE YOU ARE!

Unbalanced Forces 10 N 5 N Object Not Equal Pushing Forces will not cancel each other out and produce ACCELERATION!

Net Forces 10 N 5 N Object What is the net force and in what direction? (10 N) – (5 N) = 5 N to the right

20 N Object What is the net force and in what direction? (20 N) + (5 N) = 25 N to the right 5 N Net Forces

15 N 30 N Object What is the net force and in what direction? (30 N) – (15 N) = 15 N to the left Net Forces

10 N Object What is the net force and in what direction? (10 N) – (10 N) = 0 N Net Forces

Unbalanced Forces Forces will not cancel each other out and produce ACCELERATION!

Balanced vs. Unbalanced Forces Video

Inertia – The tendency of an object to resistance a change in motion; resist a push/pull (force) Newton’s 1 st Law of Motion: –once in motion an object stays in motion - unless acted upon by another outside force –An object at rest stays at rest – unless acted upon by another outside force First Law of Motion

Because of inertia, objects (including you) resist changes in their motion. When the car going 80 m/hour is stopped by the brick wall, your body keeps moving at 80 m/hour. Newton’s First Law and You

Second Law of Motion Force = mass  acceleration (F = m  a) Acceleration depends on the object’s mass and the force acting on the object More Force = More Acceleration More Mass = Less Acceleration

Second Law of Motion If you apply more force to an object, it accelerates at a higher rate

Second Law of Motion If the same force is applied to an object with greater mass, the object accelerates at a slower rate because mass adds inertia

Second Law of Motion

A car rolls down a ramp with a force of 2 newtons. The car has a mass of 0.5 kg. What is the acceleration of the car? F = m  a (2 N)  (0.5 kg) = 4 m/s 2 F m a

Third Law of Motion Downwards force Upwards motion For every action there is an equal and opposite reaction

Third Law of Motion