physics

Vector quantity

A quantity with both magnitude and direction

Scalar quantity

A quantity with magnitude only

what is acceleration

The rate of change of velocity

What is uniform motion?

An object moving at constant speed/velocity so acceleration is 0

What is non uniform motion?

It is when an object moves at constant acceleration

What does the gradient indicate in a distance time graph

Speed

what does the gradient show in a velocity time graph?

Acceleration

What dies the area under the line show in a velocity time graph

distance

What is stopping distance?

The distance covered by the vehicle from the moment the driver sees the obstacle to the moment the vehicle stops

What is thinking distance?

Distance travelled during the drivers reaction time

State two things that affect thinking distance?

Tiredness , alcohol or drugs , distractions

state 3 things affecting braking distance

Speed of the vehicle

Condition of brakes , tires , road

What happens when a ball is dropped 10m from the ground (example of free fall question)

-the object is falling because weight is acting downwards

-the air resistance is small so resultant is downwards

-so the object accelerates

-as the ball speeds up air resistance increases

-reducing the resultsnt force and acceleration

-eventually the air resistance becomes equal to the weight making the resultant force zero hence reaching terminal velocity

What does hookes law state?

The force applied on a string is directly proportional to the extension gained, up to the limit of proportionality

What does the law of conservation of momentum state?

Momentum before collision is equal to momentum after collision in a closed system

What are both equations for impulse?

Impulse= final momentum - initial momentum

Impulse = force x time

What is moment?

Moment is the turning effect of a force about a pivot

What does the principle of moments state?

In equilibrium clockwise moment= anti clockwise moment