Flashcards
Integrated Science Force + Pressure
Cards in this deck (37)
- 1what is a forcea force is a push or a pull exerted from one object onto another.
- 2what are 4 effects of a force ?1. Moving
2. Changing Shape
3. Stop
4. Changing Direction
5.Change Speed
6. Change Size - 3Name 3 non contact forces1. Gravitational Force
2. ElectroStatic Force
3. Magnetic Force - 4Name a contact force1. Friction
- 5what is friction ?the force between two bodies rubbing against each other.
- 6what is static or limiting friction ?when one body are just about to slide over another
- 7why is static friction larger than dynamic friction ?Because dynamic friction happens when a body is moving with a uniformed speed over the same surface and it takes more to start something that if it is already moving
- 8name 2 negative effects of fricition1. producs heat. eg. makes handrails on moving escalators hot.
2. when moving parts of machines rub against each other and get worn out
eg. bald tyres - 9name 3 ways to rudeuce the undesireable effects of friction1. adding wheels
2. lubrication
3. polishing - 10name 2 uses of friction1. walking - when the groooves of your shoe slide on a rough surface friction allows it to get grip
2. when parachuting,air resistance prevents the parachutist from falling too quickly - 11what is a magnetic field ? tthe area around the magnetic where the attraction occurs
- 12what is magnetic force ?the force of attraction or repulsion between bodies
- 13name 3 uses of magnetic force1. closing fridge doors
2. compasses
3. posting notes
4. Lifting heavy iron and steel - 14what is the force of attraction between 2 charged bodies ?electrostatic force
- 15what kind of materials are used to generate electrostatic forcecharging non metal objects
- 16what is gravitiy ?the force of attraction between masses
- 17what is weight ?the gravtiational force acting on an object
- 18what 2 factors cause the weight of an object to increase ?1. change in mass
2. increase in gravitational pull - 19where is the gravitational force strongest ?at the poles
- 20how many grams is 1N (1 neuton ) ?100 grams = 1 Neuton
- 21name the instrument used to measure forcespring balance
- 22how is pressure found ?pressure = force / area
- 23what is pressurethe force exerted on each unit area of the surface
- 24what does high or low pressure depend on ?the size of the area the over which the force is exerted
- 25when a pin is pushed into a board, is this high or low pressure and whythis is high pressure because of the small area of space the force is concentrated on
- 26name 3 uses of high presure1. cuttng
2. sewing
3. hammering nails into woods - 27name a use of low pressurewalking on soft snow
- 28what is the turning effect of the force called ?the moment of the force or the torque
- 29what 2 factors does the turning effect of the force vary on ?1. the amount of force applied
2. where the force is applied - 30how can you increase the moment of the force ?increase the size of force
increase the perpendicular distance from the line of action from the force to the pivot - 31what is a machine ?a machine is any device that helps to make work easier
- 32what is a force multiplier ?using a small force to overcome a large force
eg. lifting a car on a jack - 33what is a movement or distance multiplier ?using a small movement to produce a big movement
- 34what is a lever ?a simple machine that turns about a fixed point (fulcrum) so that when an force (effort) is applied it overcomes another force (load )
- 35what are the features of the 1st class lever ?L E F
1. produces a large force from a small force
L > E
2. pivot is futher from the effort than the load
e. scissors and claw hammer - 36what are the features of 2nd class levers ?F L E
1. produces a large force from a small force
L>E
2. fulcrum is futher frm the effort than the load
eg. wheel barrow and nutcracker - 37what are the frautures of the 3rd class levers ?FEL
1. produces a large movement from a small movement
2. effort moves a shorter distance than the load
eg. broom arm and stapler
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- Flashcards on Integrated Science Force + Pressure , created by Ashlei on 04/06/2014.
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- Ashlei
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