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20 Cards in this Set
- Front
- Back
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What is scalar? |
A quantity with magnitude (size) but no direction |
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What is vector? |
A quantity with magnitude (size) and direction |
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What does the direction of an arrow of a vector quantity represent? |
The magnitude of the vector |
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What does the size of an arrow of a vector quantity represent? |
The direction of the vector |
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What is a force? |
A force is a push or pull that acts on an object |
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What is the unit of a force? |
A Newton (N) |
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What can we use to measure a force? |
A Newtonmeter |
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What is a contact force? |
A contact force is a force that needs to touch to acts |
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What is a non-contact force? |
A non-contact force is a force that doesn’t need to touch to act |
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Give 4 examples of contact forces |
Friction, air resistance, tension and normal reaction |
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Give 3 examples of non-contact forces |
Gravitational, electrostatic, magnetic |
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Give some examples of scalars |
Energy, mass, distance, time, power, speed |
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Give some examples of vectors |
Velocity, acceleration, force, displacement |
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What is mass? |
It is the amount of matter in an object. It is constant for an object everywhere |
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What is the equation for weight? |
W=mg |
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What is the value for gravitational field strength on Earth? |
9.8 N/kg |
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What is a resultant force? |
A single force that has the same effect as all forces acting together |
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What is work done? |
It is an energy transfer. One joule of work is done when a force of one newton causes a displacement of one meter |
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What is the equation for work done? |
W=Fs |
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What does work done against frictional forces cause? |
A rise in temperature of the object or surroundings |
