Answer:
(a) motion (b) nature (c) heat (d) reduces (e) less (f) Opposes (g) Increases (h) Lesser (i) Less (j) Friction (k) Force of friction (l) Sliding friction (m) Ball bearing (n) Fluid or air (o) Decreases (p) Very small (q) Air resistance (r) Drag (s) Streamline (t) Increased, decreased (u) Reduce (v) Sliding friction (w) Rolling friction (x) Greater (y) Contact
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