# Physics

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A man using a 70 kg garden roller on a level surface exerts a force 20 kgf at 45 degrees to the ground . Find the vertical force of the roller on the ground if he ;
a) pulls the roller.
b) pushes the roller.

• Physics -

a) 70 - 20 cos45 = 55.9 kgf
b) 70 + 20 cos45 = 84.1 kgf

1 kgf = 9.8 N = 2.2 lbf

The use of kgf (kilograms of force) units is usually discouraged in physics. The preferred force/weight unit is the Newton.

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