Question

a ramp is 3 meters long and 1 meter high. under ideal conditions, this ramp would reduce the force needed to raise an object by a factor of three. however, friction is a force that opposes motion between two surfaces that are touching. according to the chart, which kind of friction opposes motion with the greatest force?
a. no friction
b. static friction
c. sliding friction
d. rolling friction
chart: different kinds of friction, with rows for weight of object (480 n, 900 n, 750 n) and columns no friction (ideal force needed to push up ramp: 160 n, 300 n, 250 n), static friction (force needed to start moving: 192 n, 390 n, 300 n), sliding friction (force needed to keep moving: 178 n, 300 n, 278 n), rolling friction (force needed to keep rolling: 168 n, 310 n, 250 n)

Explanation:

To determine which friction opposes motion with the greatest force, we compare the force values for each friction type across different object weights. For 480 N weight: Static (192 N) > Rolling (195 N? Wait, no, 195 vs 192? Wait, table shows 480 N row: Static 192, Sliding 178, Rolling 195? Wait, no, maybe I misread. Wait 480 N: No Friction 160? Wait no, first row: 480 N, No Friction 160? Wait the table: first row, Weight of Object 480 N: No Friction (Ideal Force) 160 N, Static Friction (Force to Start Moving) 192 N, Sliding Friction (Force to Keep Moving) 178 N, Rolling Friction (Force to Keep Rolling) 195 N? Wait no, maybe the numbers are: 480 N: No Friction 160, Static 192, Sliding 178, Rolling 195? Wait second row 900 N: No Friction 300, Static 390, Sliding 300, Rolling 310. Third row 750 N: No Friction 250, Static 300, Sliding 278, Rolling 250. Wait, for 900 N: Static is 390, which is higher than Rolling (310), Sliding (300), No Friction (300). For 750 N: Static 300, which is higher than Sliding (278), Rolling (250), No Friction (250). For 480 N: Rolling 195 vs Static 192? Wait maybe a typo, but overall, Static Friction values (192, 390, 300) are often higher than others. Wait the options are No Friction, Static, Sliding, Rolling. Looking at the table, for each weight, Static Friction (Force to Start Moving) is higher than Sliding (Force to Keep Moving) and Rolling (Force to Keep Rolling) in most cases (except maybe 480 N, but 390 and 300 are higher). So Static Friction opposes motion with the greatest force.

Answer:

b. Static Friction