2. What is Force?
• A push or pull
• Force has a size & direction
• All motion is created by a force
• All forces are exerted by one object on
another
**Motion does not have to occur
3. How is Force Measured?
• Measured in Newtons (N)
• The more Newtons, the greater
the force
• One tool to measure the force of
gravity is the spring scale
4. Examples of Force
• Fingers open a book
• Push buttons on a keyboard
• Gravity holds up a chair
• 2 magnets coming together
• The force that results from combining forces
Visible
Forces
Invisible
Forces
5. How to Measure Net Force
SAME
DIRECTION =
ADD
TOGETHER
20N + 25N = 45N
This is the NET FORCE
UNBALANCED
FORCE because it
produces MOTION
Person # 1
Pushing with
20N Force
Person # 2
Pushing with
25N Force
6. How to Measure Net Force
OPPOSITE
DIRECTIONS =
SUBTRACT
25N - 10N = 15N
This is the NET FORCE
UNBALANCED
FORCE because it
produces MOTION
Team # 1
Pulling with
25N Force
Team # 2
Pulling with
10N Force
7. How to Measure Net Force
OPPOSITE
DIRECTIONS =
SUBTRACT
37N - 37N = 0N
This is the NET FORCE
Wrestler # 1
Pushing with
37N Force
Wrestler # 2
Pushing with
37N Force
BALANCED FORCE
because there is NO
MOTION
