1. Forces
Third Law
First Law and Equilibrium
Second Law and Acceleration

2. May the Force be with you.
Either a push or a pull
Unit:
kg m s-2 or
newton, N
Two types:
Contact Force
Non-contact Force

3. Types of Forces: Contact Force
Tension
Friction
pull
Normal Force

4. Types of Forces: Contact Force
Upthrust
Drag

5. Thrust Thrust Types of Forces: Contact Force
Replace it with your original text.
Replace it with your original text.
Thrust
Replace it with your original text.
Thrust
Replace it with your original text.

6. Thrust Lift Types of Forces: Contact Force
Replace it with your original text.
Replace it with your original text.
Thrust
Replace it with your original text.
Lift

7. Types of Forces: Non-Contact Force
Weight
Replace it with your original text.
Replace it with your original text.
Thrust
Replace it with your original text.
Weight

8. Types of Forces: Non-Contact Force
Replace it with your original text.
Replace it with your original text.
Replace it with your original text.
Electrical Force
Magnetic Force

9. Weight
Weight
Normal force
Air resistance

10. Weight
Thrust
Drag
Friction
Normal Force

11. Weight
Thrust
Drag
Upthrust

12. Third Law Action and Reaction Law Page 56 Conditions:
The two forces must be the of the same type
The two forces are acting on different bodies
Applies in all circumstances
Force always exists in pairs
Drawing Free-Body Diagrams

13. Action and Reaction Forces

14. Action and Reaction Forces

15. First Law Law of Inertia Page 53
A body at rest will be at rest forever unless a net force acts on it to start it in motion
A body in motion will continue to move at
Constant speed
In the same direction
Forever unless a net force acts on it to
Change its speed
Change its direction
Change both

16. Balanced forces

17. Balanced forces
The book stays still!

18. The airplane moves forward at constant speed!
Balanced forces
The airplane moves forward at constant speed!

19. The car moves at constant speed!
Balanced forces
Thrust
Drag
Friction
The car moves at constant speed!

20. Second Law Law of Dynamics
If a net force is acting on a body, then it will accelerate.
The magnitude of the acceleration is proportional to the magnitude of the net force but inversely proportional to the mass.
The direction of the acceleration is the same as the direction of the net force.
Equation
Definition of a newton (page 55)

21. Unbalanced Forces
The car moves from rest.
The car speeds up.

22. Unbalanced Forces
The car slows down to stop.
The car slows down.