The cause of forces A force is a push or pull, or any action that has theability 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
Units of force The Newton (N) is a metricunit of force.• We use a Newton meter tomeasure forces.It is sometimes called a forcemeter. A force of 1 Newton is theexact amount of force neededto cause a mass of 1 kilogramto speed up by 1 m/s eachsecond.
Example of Newton One newton (N) is the force it takes to change the speedof 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 sameeverywhere in the universe. Weight is variable due to change in the magnitude of thegravitational force applied by the earth.
The force vector A force vector has units ofnewtons, just like all forces, butalso includes enough informationto tell the direction of the force. Positive and negative numbersindicate opposite directions. It is sometimes helpful to show the strength and directionof 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 otherobject 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, itcollapses to become shorter. The force created by stretching or compressing aspring always acts to return the spring to its naturallength.
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