Motion and Force
Centripetal force needed for:
A) Circular motion
B) Linear only
C) Rest only
D) Free fall only
Friction opposes:
A) Relative motion
B) Gravity
C) Mass
D) Charge
Static friction is:
A) Self-adjusting up to limit
B) Always kinetic
C) Zero always
D) Greater than motion always wrong
Banking of roads helps:
A) Provide centripetal force component
B) Increase friction only
C) Stop car
D) Reduce gravity
Mass vs weight:
A) Mass scalar constant location
B) Same thing
C) Weight has no gravity
D) Mass changes on moon
Free fall acceleration (near Earth):
A) 约 9.8 m/s^2
B) Zero
C) 1 m/s^2
D) 98 m/s^2 always
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