1. Newton’s Laws of Motion
8th Grade Science

2. I Can Statements
I CAN..
Define Newton’s First Law of Motion and provide real world examples.
Explain how friction affects motion by explaining the role that friction plays in Newton’s First Law of Motion.

3. Newton’s Laws of Motion
1st Law – An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity, unless acted upon by an unbalanced force.
2nd Law – Force equals mass times acceleration.
3rd Law – For every action, there is an equal and opposite reaction.

4. 1st Law of Motion (Law of Inertia)
An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity, unless acted upon by an unbalanced force.

5. 1st Law of Motion
Inertia is the tendency of an object to resist changes in its velocity: whether in motion or motionless.
These pumpkins will not move unless acted on by an unbalanced force.

6. 1st Law
Once airborne, unless acted on by an unbalanced force (gravity and air – fluid friction), it would never stop!

7. 1st Law
Unless acted upon by an unbalanced force, this golf ball would sit on the tee forever.

8. Turn and Talk
At your tables, you will have 1 minute to come up with a real life scenario that describes Newton’s First Law of Motion. Be prepared to share out.

9. Friction! There are four main types of friction:
What is this unbalanced force that acts on an object in motion?
Friction!
There are four main types of friction:
Sliding friction: ice skating
Rolling friction: bowling
Fluid friction (air or liquid): air or water resistance
Static friction: initial friction when moving an object

10. Think About It?
Slide a a book across a table and watch it slide to a rest position. The book comes to a rest because of the presence of a force - that force being the force of friction - which brings the book to a rest position.
If friction was not there, what would happen to the book?

11. Check For Understanding
According to Newton’s first law of motion, a moving object that is not acted on by an unbalanced force will
A. eventually come to a stop.
B. remain in motion.
C. accelerate in the absence of friction.
D. transfer its energy to another object.

12. Check For Understanding
According to Newton’s first law of motion, a moving object that is not acted on by an unbalanced force will
A. eventually come to a stop.
B. remain in motion.
C. accelerate in the absence of friction.
D. transfer its energy to another object.

13. Check For Understanding
Newton’s first law of motion applies
A. to objects that are not moving.
B. to objects that are accelerating.
C. to moving objects.
D. Both (a) and (b)

14. Check For Understanding
Newton’s first law of motion applies A. to objects that are not moving. B. to objects that are accelerating. C. to moving objects. D. Both (a) and (c)