1. Connecting Motion with Forces
Unit 6
Connecting Motion with Forces

2. Force
a “push or pull” that one object exerts on another

3. A Force; can change the velocity (speed and/or direction) of an OBJECT
*this is ACCELERATION

4. Balanced FORCES are equal in size and opposite in direction
act on a single object

5. When the FORCES acting on an object are Balanced;
The object will not ACCELERATE
* (will not have a change in velocity)

6. NET FORCE
occurs when the forces acting on an object are Unbalanced

7. A NET FORCE acting on an object;
always causes the object to ACCELERATE
in the DIRECTION of the force

8. ~ I don’t want to if I don’t have to
INERTIA
Tendency of an object to resist any change in its motion
~ I don’t want to if I don’t have to

9. Due to INERTIA;
a moving object will keep moving at the same speed and in the same direction
unless a NET FORCE acts upon the object

10. Due to INERTIA; an object at rest will remain at rest
unless a NET FORCE acts upon the object

11. INERTIA depends upon MASS!
when the MASS of an object increases
the INERTIA of an object increases

12. NEWTON’S FIRST LAW OF MOTION
also known as “Law of Inertia”

13. 1st LAW OF MOTION states:
If there is no net force acting on an object,
it will remain at rest or continue moving at a constant velocity

14. FRICTION FORCE
opposes motion
the surfaces must be touching each other

15. FRICTION FORCE * for example: eating
makes it possible to do many things we take for granted
* for example: eating

16. Gravity The force that attracts us to the center of the Earth.
* pulls at 9.8 m/s2
* depends on 2 things
♦ mass of object
♦ distance of separation

17. Weight Measurement of the pull of gravity on the mass of an object.
FORMULA
* Weight = mass ● gravity
(weight is directly related to gravity)
(mass is never affected by gravity)

18. The End