G481 Definetions
Definitions: define scalar and vector quantities and give examples;
Scalar: Magnitude without direction
Examples: Length, area, volume, distance, speed, mass, density, pressure, temperature, energy, work, power, electrical potential, charge, time
Vector: A quantity that has (both) magnitude / size and direction
Examples: Displacement, velocity, acceleration, momentum, force (lift, drag, thrust, weight), field(s), a.c. voltage, current (when calculating fields only) define displacement, instantaneous speed, average speed, velocity and acceleration;
Displacement = (net) distance moved in a particular direction.
Instantaneous speed = speed measured between two point a very small time apart
Average speed = distance covered / time taken
Velocity = speed in a given direction
Acceleration is the gradient of a velocity vs time graph. (= change in velocity / time taken) define the newton;
The (net) force which gives a mass of 1kg an acceleration of 1 ms-2. define and apply the torque of a couple;
one of forces × perpendicular distance (between forces) (Not force x perpendicular distance) define and apply the moment of force;
moment = force x perpendicular distance from pivot / axis / point define thinking distance, braking distance and stopping distance;
Thinking distance: The distance travelled (by the car) from when the driver sees a problem and the brakes are applied
Braking distance: The distance travelled (by the car) whilst the brakes are applied and the car stops (wtte)
Stopping distance: Thinking distance + braking distance define work done by a force;
work done = force x distance moved / travelled in the direction of the force define the joule;
Energy required to move a weight of 1N (through) a distance of 1 m define power as the rate of work done; power = work (done)/time or power = energy/time or power = rate of work done define the watt;
Power required to move 1N through a distance of 1m in 1 sec (Rate of
Scalar: Magnitude without direction
Examples: Length, area, volume, distance, speed, mass, density, pressure, temperature, energy, work, power, electrical potential, charge, time
Vector: A quantity that has (both) magnitude / size and direction
Examples: Displacement, velocity, acceleration, momentum, force (lift, drag, thrust, weight), field(s), a.c. voltage, current (when calculating fields only) define displacement, instantaneous speed, average speed, velocity and acceleration;
Displacement = (net) distance moved in a particular direction.
Instantaneous speed = speed measured between two point a very small time apart
Average speed = distance covered / time taken
Velocity = speed in a given direction
Acceleration is the gradient of a velocity vs time graph. (= change in velocity / time taken) define the newton;
The (net) force which gives a mass of 1kg an acceleration of 1 ms-2. define and apply the torque of a couple;
one of forces × perpendicular distance (between forces) (Not force x perpendicular distance) define and apply the moment of force;
moment = force x perpendicular distance from pivot / axis / point define thinking distance, braking distance and stopping distance;
Thinking distance: The distance travelled (by the car) from when the driver sees a problem and the brakes are applied
Braking distance: The distance travelled (by the car) whilst the brakes are applied and the car stops (wtte)
Stopping distance: Thinking distance + braking distance define work done by a force;
work done = force x distance moved / travelled in the direction of the force define the joule;
Energy required to move a weight of 1N (through) a distance of 1 m define power as the rate of work done; power = work (done)/time or power = energy/time or power = rate of work done define the watt;
Power required to move 1N through a distance of 1m in 1 sec (Rate of