NAT.SCI.Motion, speed at acceleration

MotionThe relationship between forces and

motion is counter-intuitive and so needs careful explanation. We

provide experiments that show a variety of ways of measuring position and time. These measurements lead

to concepts of speed, velocity, momentum and acceleration.

SPEEDDistance travelled per unit time.

Speed is the scalar quantity that is the magnitude of

the velocity vector.v = d / t

An airplane wanting to take off runway at 1720m for 32 s until is

finally lifts off the ground. Determine the speed taken before

takeoff.

52.75 m/s

ACCELERATIONAcceleration is the rate of change of velocity as acceleration is the

second derivative of position with respect to time or, alternately, the first derivative of the velocity with

respect to timea = F / m

a = Δv/Δt = (vfinal - vinitial) / (tfinal - tinitial)

Determine the acceleration of the car if it started at stop to the speed

of 25 m/s at the time of 10 secs

2.5 m/s2