Answer:
A skateboarder coming down the ramp.
When something is going up against ( up or <u><em>down</em></u> ) something it causes friction.
Hope this helps!
The lab safety equipment that is least likely to be used if proper eye protection is used is d. fire extinguisher<span>. A fire extinguisher serves to put fires out by cutting off the oxygen to a fire and operates by a spraying action. Even if an injury occurs, a fire extinguisher is extremely unlikely to be used.</span>
Answer:
1. Convection current
2. Convective heat transfer
3. The Atmosphere
4. Air pressure
