1. Acceleration – the change in speed or direction of a moving object
Objective 5 Definitions:
Sir Isaac Newton - January 2, 1643 – March ; a scientist who described the motion of objects using 3 laws in his 1687 work entitled, ‘Principia’
Momentum – the ‘strength’ of a moving object due to the object’s mass and speed. The more mass and speed the higher the momentum.
Inertia - a way of measuring how hard it is to change the momentum of an object; the more mass an object has the more inertia
Acceleration – the change in speed or direction of a moving object
balanced forces – where all of the forces on an object are equal and opposite so they cancel each other out. This means the object is either not moving or is moving at a constant speed.
unbalanced force - where all of the forces on an object are not equal. This means the object is accelerating in one direction or is changing directions.
Reaction – an action in a reverse direction to an action

2. Review Questions
What is the difference between speed and acceleration?
Mandy is walking at a steady pace of 2km/hr. Suddenly a bear jumps out of the woods and Mandy begins to run but the bear is running faster and overtakes her, then knocks her to the ground. Mandy lies very still, hoping not to be eaten. The bear then says’ “Hello, do you have change for a euro?” Mandy breathes a sigh of relief, hands the bear some change then they both walk steadily in opposite directions to the north and to the south.
Identify and describe all speeds
Identify and describe all accelerations
Identify and describe all velocities

3. Newton’s Laws of Motion
Described the laws in `Principia Mathematica`written in 1687
25 December 1642 – 20 March 1727

4. Newton’s 1st Law of Motion
An object will stay at rest until acted on by an outside force
An object will stay in motion at the same speed until acted on by a force
Inertia is how much an object resists a change in motion
Inertia = mass
(car crash)
(*einkaufswagon & ball)

5. Write a hypothesis – what are the parts you need in the hypothesis?
Lab Question – How does the motion of a ball change when dropped from a person standing still versus a person running
Write a hypothesis – what are the parts you need in the hypothesis?
Was your hypothesis supported (why not proven?)
Describe the motions of the tennis ball and explain how this is related to Newton’s first law of Motion.

6. Review – draw a force diagram for each moving object

7. Newton’s 3rd Law of Motion
For every force there is an equal and opposite force
The foot pushes on the skateboard and the skateboard pushes back on the foot with an equal and opposite force
What is another example of Newton’s 3rd law in these pictures?
(QUIZ)

8. Newton’s 2nd Law of Motion
F=ma
The force (F) on an object is equal to mass (m) of the object multiplied by acceleration (a) of the object.
What does this illustration tell you about F=ma?
What does this illustration tell you about the acceleration of the elephant and the mouse?

9. Newton’s 2nd Law balance
F = ma
*Ping-pong

10. Identify the illustrations showing unbalanced forces and the illustrations showing balanced forces. What is the difference?

11. Additional Videos & websites
e=related (N1)
(N1)
(N2)
a.cfm (N3)
do-rockets-work-in-the-vacuum-of-space (N3 and rockets)
newtons-laws/newtons-laws-of-motion/e/newtonsfirst (new quiz)