1. Prompt under the document camera
Thursday, March 2, Day 1
1. Please have these
Items on your desk.
Agenda
Science Starter
Sheet
Note
book
Distance
Displacement WS
2- Science Starter:
Prompt under the document camera

2. Table of contents update . . .
Pg / Newton's Second law

3. Newton’s Second Law of Motion
How fast does it go?

4. Acceleration
An unbalanced force causes something to accelerate.

5. Acceleration
Acceleration is directly related to the size of the force and the direction of the force.
It accelerates in the direction you push or pull it.

6. In other words….
Large Force = Large Acceleration F a

7. So….if you push twice as hard, it accelerates twice as much.
In other words….
Small Force = Small Acceleration F a
So….if you push twice as hard, it accelerates twice as much.

8. But there is a twist….
Acceleration is INVERSELY related to the mass of the object.

9. In other words…..using the same amount of force….
Small acceleration a
Large Mass
Large acceleration F a
Small Mass

10. Newton’s Second Law
Newton, that brilliant genius, observed those “rules” of acceleration and came up with his second law of motion. It is both a formula & a law.

11. Newton’s Second Law
The acceleration of an object is directly proportional to the net force & inversely proportional to it’s mass.
F = ma
Force = Mass x Acceleration

12. Okay then…
First, you need to know the units of Force, Mass & Acceleration.
The units used for force are Newtons (N) (kg/m/sec²)
The units used for mass are kilograms (kg)
The acceleration units are meters per second squared (m/sec²).

13. Force, Mass, Acceleration
Force = Mass x Acceleration
F= ma
How much force is required to accelerate a 50 kg mass at 4 m/s2? F= ? F=
50 kg *
4 m/s² M=
50 kg A=
4 m/s² F=
200 N

14. What is the acceleration of a 7 kg mass being pulled by a 56 N force?
A=f/m M=
7 kg
56N
/ 7 kg A= ?
8 m/s²

15. What is the mass of a block accelerating at 2 m/s2 and pushed by a 9 N force?
M=f/a M= ?
9N / 2m/s²
A =
2 m/s
4.5 kg