A scalar quantity has magnitude (size) only, e.g. number of apples.
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Vector
A vector quantity has magnitude and direction, e.g. velocity, which shows the speed and the direction of travel.
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Contact Forces
The objects are actually touching, e.g. the tension as two people pull against one another.
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Non-contact Forces
The objects are not touching, e.g. the force of gravity acts even when the objects are not touching.
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Examples of Contact Forces
Friction, Air-resistance/ drag, Tension, Normal contact force, Upthrust
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Examples of Non-Contact Forces
Gravitational Force, Electrostatic Force, Magnetic Force
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Gravity
The force of attraction between all masses. The force of gravity close to Earth is due to the gravitational field around the planet. The mass of an object is related to the amount of matter it contains and is constant.
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Weight
The force acting on an object due to gravity. The weight of an object depends on the gravitational field strength where the object is and is directly proportional to its mass.
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Weight Equation
Weight=mass x gravitational field strength (W=mg)
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Resultant Force
When more than one force acts on an object, these forces can be seen as a single force that has the same effect as all the forces acting together. This is called the resultant force.
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Gravitational Field Strength on Earth
10N/kg
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Other cards in this set
Card 2
Front
A vector quantity has magnitude and direction, e.g. velocity, which shows the speed and the direction of travel.
Back
Vector
Card 3
Front
The objects are actually touching, e.g. the tension as two people pull against one another.
Back
Card 4
Front
The objects are not touching, e.g. the force of gravity acts even when the objects are not touching.
Back
Card 5
Front
Friction, Air-resistance/ drag, Tension, Normal contact force, Upthrust
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