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2. The cause of forces
 A force is a push or pull, or any action that has the
ability to change motion.
 The key word here is action, force is an action.
 Here are some ways of describing forces:
 A push
 A pull
 A stretch
 A squeeze
 A catch
 A twist

3. Forces can make things:
 Speed up
 Slow down
 Change direction
 Change shape

5. Units of force
 The Newton (N) is a metric
unit of force.
• We use a Newton meter to
measure forces.
It is sometimes called a force
meter.
 A force of 1 Newton is the
exact amount of force needed
to cause a mass of 1 kilogram
to speed up by 1 m/s each
second.

6. Example of Newton
 One newton (N) is the force it takes to change the speed
of a 1 Kg mass by 1 m/s in 1 second.
 One pound of force equals 4.48 newtons.

7. Gravity and weight
 The force of gravity on an object is called weight.
 Mass and weight are not the same thing.
 Mass is an intrinsic property of a body, as it remains the same
everywhere in the universe.
 Weight is variable due to change in the magnitude of the
gravitational force applied by the earth.

8. The force vector
 A force vector has units of
newtons, just like all forces, but
also includes enough information
to tell the direction of the force.
 Positive and negative numbers
indicate opposite directions.
 It is sometimes helpful to show the strength and direction
of a force vector as an arrow.
 when drawing a force vector, you must choose a scale.
If 1 cm = 1 N, how many newtons of force does this line represent?

9. Forces in springs and ropes
 Tension is a force that acts in a rope, string, or other
object that is pulled.
 Tension always acts along the direction of the rope.

10. Forces in springs and ropes
 When you apply a compression force to a spring, it
collapses to become shorter.
 The force created by stretching or compressing a
spring always acts to return the spring to its natural
length.

11. The End
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