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What is Force?

What is Force?. Force Definition. The word force and be used in many different ways. However the definition in science is simply a push or pull on a object in a certain direction. Force has both size and direction. Force can change the acceleration of an object.

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What is Force?

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  1. What is Force?

  2. Force Definition • The word force and be used in many different ways • However the definition in science is simply a push or pull on a object in a certain direction • Force has both size and direction • Force can change the acceleration of an object. • We measure force using the Newton or (N)

  3. Forces acting on objects • Force cannot occur without an object to act upon. • However even if forces are acting on an object motion may still not occur • An example of this is the chair your sitting in you are exerting force on it but so is the floor so it does not move.

  4. Unseen sources and receivers of force • There are forces that are present and invisible at all times • The big one that we experience is gravity • However there are others such as magnetic force.

  5. Net Force • At any time there are many forces acting upon an object. • We call the combination of these forces the net force. • You determine net force by looking at the power and direction of all the forces acting on something

  6. Forces in the same direction • Imagine that you are pulling an object with 15N of Force while a friend pushes it with 10N of force, What is the net force on the object? • The object has 75N of gravitational force pushing down on it. Are you and your friend able to move the object?

  7. Forces in different directions • When multiple forces are acting in different directions you have to take the difference of the forces. • For example if you are playing tug of war and you are pulling with 25N of force and your opponent is pulling with 26N of force who is winning? • What is the net force?

  8. Balanced Forces • If you know the net forces on an object you can determine if the forces are balanced or not. • If forces are balanced it means the net force is 0N • Most objects around you have balanced forces acting on them • Everything from you sitting in a chair to the roof above us is a result of balanced forces

  9. Unbalanced Forces • When forces are unbalanced there is a change in motion • In order to create motion in an object you must unbalance the forces acting on it • One example of this is kicking a soccer ball, when the ball is sitting still forces are balanced, when you kick it, those forces become unbalanced. • An object can continue to move after the orce has been removed.

  10. Review • If you are pulling on a rope with 35 N of force and someone else is pulling with 25 N of force in the opposite direction what is the net force? • What happens when forces become unbalanced? • A boy pulls a wagon with a force of 6N and another boy pushes it with 4N of force, What is the net force? • List 3 forces that you are currently exerting?

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