what size unbalanced force acts on a mass of 3 kg's which accelerates at 4 m/s squared on a flat surface if a) there is no friction b) there is a friction of 4 newtons
Can anyone help. My pooch has sneakily pee'd agaist the chair n when I have found it today my wooden floor under the chair has gone black. DOES ANY1 KNOW HOW TO GET RID OF THE DIRTY BLACK MARK????
