Question.
An automobile vehicle has a mass of 1500 kg. What must be the force between the vehicle and road if the vehicle is to be stopped with a negative acceleration of 1.7 ms–2 ?
An automobile vehicle has a mass of 1500 kg. What must be the force between the vehicle and road if the vehicle is to be stopped with a negative acceleration of 1.7 ms–2 ?
Solution:
Mass of the vehicle, $\mathrm{m}=1500 \mathrm{~kg} ;$ negative acceleration, $\mathrm{a}=-1.7 \mathrm{~ms}^{-2}$
$\therefore$ Force of friction between the road and vehicle
$\mathrm{F}=\mathrm{ma}=1500 \times(-1.7)=-2550 \mathrm{~N}$
Negative sign means force is acting in the direction opposite to the direction of motion of the vehicle.
Mass of the vehicle, $\mathrm{m}=1500 \mathrm{~kg} ;$ negative acceleration, $\mathrm{a}=-1.7 \mathrm{~ms}^{-2}$
$\therefore$ Force of friction between the road and vehicle
$\mathrm{F}=\mathrm{ma}=1500 \times(-1.7)=-2550 \mathrm{~N}$
Negative sign means force is acting in the direction opposite to the direction of motion of the vehicle.