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22 Cards in this Set
- Front
- Back
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what is a force |
a push or pull upon an object |
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What are the 7 effects of a force |
1.It can start a stationery object 2.You change the direction of an object 3.It can change the speed of the object 4.You can stop a moving object 5.It change the size of an object 6.It change the shape of an object 7.It can bring about turning effects in an object |
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What is force measured with |
It is measured with a spring balance |
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What is SI unit of force |
It is the Newton (N) |
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What is speed |
Speed is a measure of how fast something or someone moves |
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What does a speed of an object depends on |
It depends on distance move and time taken |
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What is the SI unit of speed |
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How can forces be classified |
Forces can be classified as contact and non contact forces |
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What is a contact force |
A contact force is a force when objects touch |
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What is a non contact force |
A non contact force is a force that acts at a distance from an object |
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What is friction |
Friction acts whenever one surface rubs against on another surface |
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What are the two properties of friction |
-Friction always opposes a movement on another object -Friction also causes surface to heat up |
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Name some ways in which friction is useful |
-Friction between the skateboard wheels and the ground allows this skateboarder to move forward -Friction between the bicycle wheel and brakes slows the bicycle down -Friction between the pencil and paper allows us to write |
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How can friction be a nuisance |
-Friction makes movement more difficult -Friction wears away materials |
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Ways to reduce friction |
-Using smooth surfaces, e.g. the lanes in a bowling alley -Watch the shockwave below to understand how an object moves on a different surface -Use ball bearings, e.g. moving parts of machines |
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How is magnetic force use in transportation |
It use in maglev train as there is no contact between the track and vehicle,friction is reduced.This allows the train to move very fast |
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What is gravity |
Gravitational force is a force which that attracts objects to the Earth and is a non contact force |
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Why are you lighter on the moon |
The moon’s gravity is about 1/6 of earth |
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What is weight |
Weight is a measure of the force of gravity exerted on an object |
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What is the unit of weight |
Newton |
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What is mass |
Mass is a measure of the amount of matter in an object |
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What is the difference between mass and weight |
Mass is a measurement of the amount of matter while weight is a measurement of the pull of gravity Mass is measured by a electronic balance while weight is measured by a spring balance |
