Force

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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

Forces can make things:

Speed up Slow down

Change direction Change shape

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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.

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.

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.

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?

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.

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.

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