1. Objective
SWBAT describe Newton’s second law of motion and use it to explain the movement of objects.

2. Chart of the Day

3. Review: Vocabulary Force: a push or a pull
Net force: the sum of all forces acting on an object.
Balanced forces: forces that cancel each other out  objects do not accelerate
Unbalanced forces: forces that do not cancel each other out  object accelerates

4. Review: Newton’s First Law of Motion
An object at rest will remain at rest unless acted upon by an outside force.
An object in motion will remain moving at the same speed unless acted upon by an outside force.

5. How it relates to velocity-time graphs…

6. Newton’s Second Law of Motion
When a force acts on an object, the object accelerates in the direction of the force.

7. Newton’s Second Law of Motion (cont.)

8. Check For Understanding
A box with a mass of 20 kg is pushed with an acceleration of 2 m/s2. The force acting on the box is…
5 N
10 N
20 N
40 N

9. Check For Understanding
An object with a mass of 30 kg is moving at a constant speed of 10 m/s. What force is pushing the object?
v = constant at 10 m/s  acceleration = 0 m/s2
m = 30 kg

10. Check For Understanding
What will be the acceleration of an 8kg object when it is pushed with a force of 16 N?
0.5 m/s2
128 m/s2
2 m/s2
4 m/s2