A man using a 70kg garden roller on a level surface, exerts a force of 200N at 45 degree to the ground. Find the vertical force of the roller on the ground if a) he pulls it b) pushes it.
2007-04-17 05:41:02 · 2 answers · asked by iqnabeel 1 in Science & Mathematics ➔ Physics
The force of the roller is the weight plus the vertical component of the gardener force
W = 70kg * 9.8m/s^2 = 686 N
G = +/- 200N * sin(45) = +/- 141 N
When he pulls, G is negative and
F = 686N - 141N = 545 N
When he push, G is positive and
F = 686N 141N = 827 N
2007-04-17 05:52:08 · answer #1 · answered by catarthur 6 · 0⤊ 0⤋
The force of the roller without the push or pull is
70*g
Using g=10
700N
When the force pulls the roller it lightens the vertical reaction force of the roller with the ground by 200*sqrt(2)
700-200*.707
When the force pushes the roller it increases the vertical reaction force wit the ground by 200*sqrt(2)
700+200*.707
j
2007-04-17 12:50:09 · answer #2 · answered by odu83 7 · 0⤊ 1⤋