1. FORCE

3. FORCE
A force is a push or a pull or both. A force cannot be seen but we can feel and
observe the effects of the force.
PULL
PUSH
A force to move an object away from
our bodies
A pull is when we apply a force to
move an object towards our body
COMBINATION OF PUSH AND PULL
- playing a guitar - scrubbing the floor
- sawing wood - rowing a boat

5. Stretch a rubber band
Press a sponge
Squeeze a spring
After
After
After
An object that will return to its original shape and size after being squeezed, pressed, twisted and stretched is elastic

6. Drop a glass
Tear a piece of paper
Crush an empty can
After
After
After
An object that will not return to its original shape and size after being squeezed,
pressed, twisted and stretched is inelastic

7. IMPORTANT POINT EXPLANATION
A solid cannot be compressed or stretched!!
EXPLANATION
The shape of a solid object changes when a force is applied to it whether it’s temporarily or permanently
Example: crushing a can – changes the shape
permanently

8. when a force is applied in
the opposite direction
(or different direction), the
moving object will change its moving direction

9. An object will move faster when
a force is applied
It moves in the same direction as
the applied force
Misconception?
A force is needed to keep an object moving with a constant speed
Explanation:
You do not need forces to move at a steady speed but if you keep the same
speed yet change direction, like a moon around a planet, then you have a
force acting on you anyway

10. A stationary ball will move when it is
kicked
Moves in the same direction as the
applied force
The moving ball will stop when
an equal force is applied in the
opposite direction of its motion

11. Force is a property of an object. An object has force
and when it runs out of force it stops moving
EXPLANATION
Newton 1st Law
an object at rest or in motion will remain in that state unless an external force is applied to the object