 Object on a slope

 
Note that the acceleration down the slope is equal for any mass under the same conditions. If the acelleration down the slope is 0, then it means that the force due to gravity down the slope is not sufficient to overcome friction. Representative coefficients of friction include: woodonwood (~0.3); acryliconacrylic (~0.8); steelonsteel (~0.6); teflononteflon (~0.04).  