a box of books weighing 319 N is shoved across the floor by a force of 485N exterted downward at an angle of 35 degrees below the horizontal.
a. if uk between the box and the floor is 0.57, how long does it take to move the box 4.00 m starting from rest.
b. if uk between the box and the floor is 0.75 how long does it take to move the box 4.00 m from rest.
2006-11-12 12:17:53 · 3 answers · asked by socom_lover 2 in Science & Mathematics ➔ Physics
a. Calculate the horizontal component of the 485 N.
Fh = 485 N*cos35
Calculate the force of friction.
Ff = 0.57*319 N
Calculate the net force.
Fn = Fh-Ff
Calculate the mass of the box.
W = m*g
Calculate the acceleration.
Fn = m*a
Calculate time to move s = 4.00 meters
s = (1/2)*a*t^2
b. Repeat with uk = 0.75
2006-11-12 12:57:03 · answer #1 · answered by sojsail 7 · 0⤊ 0⤋
If an merchandise quickens, through fact somebody is pushing it with F, by potential of slidding alongside a floor, the floor will exert some frictional rigidity, f , opposing the action. through fact the block is accelerating F > f . Newton's third regulation tells you the the block exerts an equivalent rigidity ,F, lower back on the pusher. The third regulation additionally tells you that the block will exert an equivalent rigidity ,f, lower back on the floor. it is approximately it. Neither of those "lower back" forces will inform you something with regards to the block's action through fact they don't seem to be appearing on the block.
2016-12-10 08:00:41 · answer #2 · answered by casco 4 · 0⤊ 0⤋
It never moves and that will be forever, the floor is anti-slip rubber!
2006-11-12 12:31:40 · answer #3 · answered by diSota 2 · 0⤊ 0⤋