EK 1001 physics number 228

[2010premed]

---

Members do not see this ad.

Assuming that a vehicle slides to a stop without brake or tire failure, which of the following is NOT true?

A. A heavy truck will require more room to stop than an economy car
B. The number of wheels on a vehicle does not change the time needed to stop it
C. Acceleration is constant until the vehicle stops.
D. A greater kinetic coefficient of friction means a shorter stopping time

Why is the answer A? If it's a bigger car, won't it take longer to come to rest because it has more inertia?

 

[fizzgig]

yes it has more inertia, but it is also heavier and so the frictional force is going to be larger.

i assume the answer is b?

 

[2010premed]

ok thanks... it asked for which one a not true, so the answer is A as you explained

 

[fizzgig]

and that, ladies and gents, is why the mcat is going to kill me dead. i don't know why i become illiterate all of a sudden on so many of these problems...