True or false - the reason a car moves at a constant speed along the road is b/c the friction between...?

true or false - the reason a car moves at a constant speed along the road is because the friction between the tires and the road causes a forward reaction force to act on the carTrue or false - the reason a car moves at a constant speed along the road is b/c the friction between...?
TRUE.





***CAREFUL, someone INCORRECTLY said that friction does not create a ';forward force';. But the real sentence was ';forward REACTION force'; - meaning a force IN OPPOSITION TO the motion***





In order for the car to move at a CONSTANT VELOCITY (i.e. *NO* acceleration) the total force on the car must be ZERO.





i.e.





Force of car's engine = Force of friction





or





F(engine) = F(fric)





or





F(engine) - F(fric) = mass x acceleration





But we determined that acceleration = 0 (because the car is moving at a CONSTANT velocity). So therefore:





F(engine) - F(fric) = 0





So the force of friction balances the force of the engine and the car moves at a constant velocity. Your statement is TRUE.








That's your answer!











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anAGAH.True or false - the reason a car moves at a constant speed along the road is b/c the friction between...?
For every action there is a reaction,





So the car's tires move the car forward through force on the road





It's pair force in the opposite direction is the friction force on the tires.





So this statement is FALSE, because the friction force doesn't cause the forward motion


the forward motion causes the friction force
False.


That is truly a badly worded explanation. For starters, friction does not cause a ';forward force';. The engine does that. Friction prevents slippage of the tires.
um..theconstant speed depends on you..but it there was no friction, the cause would be inertia~ or Newton's 1st Law