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Resultant forces

Resultant forces. Joseph Goodhart. What are resultant forces?.

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Resultant forces

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  1. Resultant forces Joseph Goodhart

  2. What are resultant forces? • Resultant forces are the total of all forces acting on the object. E.g. If a rocket takes off and the thrust is two and gravity acting on it is one then the resultant force is one. So it accelerates in the direction the strongest force pushes it. • If an object has resultant force of zero acting on it then: If it is stationary it doesn’t move at all. Like the rocket not having enough thrust to overcome the gravity acting on it. If it is moving it keeps moving at a constant speed. Like the thrust and gravity equalling out as it goes through the atmosphere. It doesn’t keep accelerating or stop moving.

  3. What if they’re not balanced? • If the resultant force is not zero then the object begins to move in the direction of the resultant force. Moving objects speed up, slow down and change direction. Of course relying on the resultant force to do these things. • In this example the thrust is greater than the gravity so the weights are lifted. • And here when he lowers the bar the thrust is less than the gravity so the weights go down.

  4. Acceleration in resultant forces • When the resultant force of an object is zero then the object starts to accelerate. An object accelerates in the direction of a resultant force larger the force larger the acceleration. • To find acceleration you must do: Resultant force (N) =Acceleration (M/S/S • Mass (KG)

  5. Forces that act against thrust • Drag: When an object goes through air the air resistance pulls it back in the other direction. E.g. Parachutes work due to drag. • Contact force: Happens when two objects are pushed together. They have opposite forces acting in both directions. E.g. Two cars crashing. • Friction: When two things rub against each other. E.g. walking. • Gravity: The earths core pulling us down onto it. E.g. A parachutist.

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