Posted by Clothilda on Wednesday, January 25, 2012 at 9:58am.
We can't make drawings for you here.
Draw a rectangular block on a hozontal line (the level surface).
The forces acting on it, which should be shown as arrows, are:
Weight 20g = 198 N down
Friction force 20 N backwards
Ground force 198 - 100 sin30 N up
Pulling force 100 N at 30 deg above horizontal
The vertical component of the pulling forces helops to reduce the ground force.
Since there is a net forward force,
100 cos30 - 20 = 66.6 N,
the block will accelerate
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