1. How to Calculate Net Force

2. What is a force?
Force is a push or pull in a particular direction.

3. Forces can affect motion in several ways:
They can:
make objects start moving
Change direction

4. FORCE FACTS: Measured in Newton's (N) Forces usually act in pairs
Forces act in a particular direction
Usually cannot be seen

5. How to Calculate Net Forces
When two forces act in the same direction on an object, the net force is equal to the sum of the two forces 8N
14N 6N

6. How to Calculate Net Forces Continued
When two unequal forces act in opposite directions on an object, the net force is the difference of the two forces
18N
50N
32N

7. 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/s/s M=
50 kg A=
4 m/s/s F=
200 N

8. What is the acceleration of a 7 kg mass being pulled by a 56 N force?
F=ma M=
7 kg
56N =
7 kg * A A= ?
8 m/s/s

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