1. Forces Diagram and Newtons 1st Law
Day 22

2. Learning Target
I can identify examples of balanced and unbalanced forces. I can calculate net force using force diagrams. I can explain Newton’s 1st Law.

3. Explain: Concept Map New Clean Sheet-On the Right-Sided
Forces
Balanced Forces
Definition
At Rest or Constant Velocity
Fact
Equal Force
Unbalanced Forces
Change in Velocity and Direction object accelerates
Unequal Forces

4. Explore: Forces
Directions: Left-side, Draw the following force diagrams.
Write the following statements under the correct force diagram.
Balanced-No movement
Unbalanced-Movement to the left
Unbalanced-Movement to the right

5. Explore: Force Diagrams
Directions: Left-side, Using your knowledge of vectors. Calculate the Net Force of the three force diagrams. (Net force means total.) A. B. C.

6. Explain: T-Chart for Newton’s Laws
Newton’s Newton’s Newton’s
1st Law nd Law rd Law

7. Explore: Newton’s First Law Inertia Mini-investigation
Directions: On the left-side complete the questions after each trial…
Procedure:
Place an index card on a flat table. Place an object in the middle of the card. As quickly as you can, try to pull the card out from under the object. Draw and write what happens to the object.
Place an index card on a flat table. Place an object in the middle of the card. Slowly pull the index card out from under the object. Draw and write what happens to the object.
Place an index card on a flat table. Place an object in the middle of the card. This time slowly accelerate the card, and then suddenly bring it to a stop. Draw and write what happens to the object.
Repeat Steps 1, placing the index card over a beaker. Draw and write what happens to the object.
Analysis Questions
Use the concepts of inertia and friction to explain the behavior of the object each time you moved the card.
How would your observations be different with an object of greater mass? Test your predictions.

8. Engage: Science 360: Newtons 1st Law

9. Exit Slip
A hockey puck is sliding across the ice at a constant velocity. Diagram all the forces acting on the hockey puck.