Flashcards
Physics Unit 2
Cards in this deck (8)
- 1Physics Unit 2 Revision CardsContents:
-motion
-forces
-work, energy and momentum
-current electricity
-mains electricity
-radioactivity
-energy from the nucleus - 2Distance time graphs~ gradient of a line represents speed, steeper=faster.
~ when the line is horizontal the object is stationary.
~ speed(m/s)=distance(m)/time(s) - 3Velocity and acceleration~ if an object changes direction it changes velocity even if the speed stays the same.
~ if velocity changes we say that it accelerates of decelerates.
~ acceleration(m/s2)=final v-initial v/time (s)
~ if the value calculated is negative it is decelerating. - 4Velocity-time graphs~ gradient represents acceleration
~ steeper gradient=greater acceleration
~ if line is horizontal, acceleration is 0 and object moves at constant velocity
~ if gradient is negative its decelerating
~ area under graph is distance travelled - 5Forces between objects~ forces measured in newtons (N)
~ objects always exert equal and opposite forces on each other
~ force can change shape of an object or change its motion - 6Resultant forces~ when resultant force is 0 the object is at rest of moving at constant speed
~when not 0 the object is accelerating if direction of force is same as direction of object or decelerating if direction of forces and object is in opposite directions - 7Force and acceleration~ greater resultant force=greater acceleration
~ greater mass of object=smaller acceleration
~ force(N)=mass(kg) x acceleration(m/s2) - 8On the road~ thinking distance, braking distance, stopping distance
~ thinking distance increased by tiredness, being under influence of alcohol or drugs
~ braking distance increased by poor weather, worn tyres or brakes
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- Flashcards on Physics Unit 2, created by ILMDB on 14/12/2014.
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