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- 1. Multiple-choice45 seconds1 pt
Sliding a body down over another body means that ...........
the friction force between the two bodies is larger than the movement
the friction force between the two bodies is smallerthan the movement
the movement force between the two bodies is smaller than the friction force
- 2. Multiple-choice45 seconds1 pt
The friction force acts in a direction ……… to the direction of motion.
opposite
same
parallel
perpendicular
- 3. Multiple-choice45 seconds1 pt
During moving a ball on the ground, a(an) …………….. arises.
light energy
friction force
electricity
all of them
- 4. Multiple-choice45 seconds1 pt
Friction force is the reason for stopping the body during motion.
True
False
- 5. Multiple-choice45 seconds1 pt
The pushing of an object on the ground forwards is opposited by a friction force at the same direction.
True
False.
