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| Pregunta | Respuesta |
| Physics Unit 2 Revision Cards | Contents: -motion -forces -work, energy and momentum -current electricity -mains electricity -radioactivity -energy from the nucleus |
| Distance 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) |
| Velocity 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. |
| Velocity-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 |
| Forces 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 |
| Resultant 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 |
| Force and acceleration | ~ greater resultant force=greater acceleration ~ greater mass of object=smaller acceleration ~ force(N)=mass(kg) x acceleration(m/s2) |
| On 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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