MOTION SPEED ms Kmh Uniform Rectilinear Motion URM

MOTION

SPEED m/s Km/h

Uniform Rectilinear Motion URM is motion with a straight line trajectory over the same distance in the same amount of time. The speed is constant over the whole trajectory.

Uniform Rectilinear Motion

ACCELERATION

m/s 2 distance=1/2 at 2

1. - A car is waiting for the traffic lights to turn green. When this happens, the driver steps on the accelerator and the car reaches 80 km/h in 5 s. what´s the car acceleration rate? 2. - A motorcyclist is travelling along a motorway at a spaeed of 120 km/h. Suddenly she sees a maximun speed sign for 90 km/h ahead of her, so she reduces her speed to that value in 3 s. Work out the acceleration of the motorbike. 3. -A motorcyclist is travelling at 104 km/h on a motorway. At a specific moment, the rider decides to overtake a car in fornt of him and increases his speed to 120 km/h in 2 s. What is the acceleration rate? 4. -A car travelling at a speed of 0 km/h comes to a complete stop in 5 s when the brakes are pressed. Calculate the acceleration. -5 m/s 2 2. 25 m/s 2 -2. 8 m/s 2 4, 4 m/s 2

Uniformly Accelerated Rectilinear Motion UARM is motion with a straight line trajectory and constant acceleration. The speed varies by the same amount in the same intervals of time.

FREE FALL

Uniformly Accelerated Rectilinear Motion S=1/2 at 2