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Questions and Answers
What does an arrow in a force diagram represent?
What does an arrow in a force diagram represent?
The direction of the force
What is the significance of balanced forces on a stationary object?
What is the significance of balanced forces on a stationary object?
The object remains at rest
How does the normal force and weight interact when a person stands still on the ground?
How does the normal force and weight interact when a person stands still on the ground?
The normal force acts upwards and is equal to the weight acting downwards
What keeps a stationary floating object in position on still water?
What keeps a stationary floating object in position on still water?
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What does a force diagram represent?
What does a force diagram represent?
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Why does a buoy with an automatic weather station float?
Why does a buoy with an automatic weather station float?
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Study Notes
Forces on Stationary Objects
- An arrow in a force diagram tells you the direction and magnitude of the force.
- A stationary object has balanced forces acting on it, e.g. weight and normal force.
- When you stand still, your weight acts downwards on the ground due to gravity, and the ground exerts a normal force upwards on the soles of your shoes.
- The strength of the weight and normal force are the same, and they balance each other.
Force Diagrams
- A force diagram can represent the balanced forces on a stationary object more clearly.
- A force diagram can be used to show the forces acting on an object, such as weight and normal force.
Weight and Upthrust
- A stationary floating object is held in position by the balanced forces of weight and upthrust.
- The weight of the object acts downwards, and is balanced by the upthrust of the surrounding fluid (e.g. water).
- The upthrust of the water is equal in strength to the weight of the object, and they balance each other.
Examples of Forces
- Examples of stationary objects with balanced forces include: a person standing still, a buoy floating on water, and other objects that are not moving.
- Drawing force diagrams for each of these objects can help to illustrate the balanced forces acting on them.
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Description
This quiz will test your knowledge of force diagrams in physics. It covers the information conveyed by arrows in force diagrams, including balanced forces, weight, normal force, and gravity.
