- Joined
- Apr 16, 2010
- Messages
- 660
- Reaction score
- 3
Here's the question(s)
#224: When a car is towed at constant velocity, the frictional force between the road and its tired is:
#225: When a car moves under its own power at constant velocity, the frictional force between the road and the tires that propel the car is:
Here's the choices for both questions:
A. static and in the direction of the motion of the car.
B. static and in the opposite direction to the motion of the car
C. kinetic and in the direction of the motion of the car.
D. kinetic and in the opposite direction to the motion of the car
Okay, I understand that in both scenarios the friction is static because the point of position relative to the wheel and ground doesn't change (due to the nature of rolling motion)
The answer for #224 was B. The answer for #225 was A. I'm having trouble trying to understand which direction friction points. Also, why does the direction of friction change?
Thanks.
#224: When a car is towed at constant velocity, the frictional force between the road and its tired is:
#225: When a car moves under its own power at constant velocity, the frictional force between the road and the tires that propel the car is:
Here's the choices for both questions:
A. static and in the direction of the motion of the car.
B. static and in the opposite direction to the motion of the car
C. kinetic and in the direction of the motion of the car.
D. kinetic and in the opposite direction to the motion of the car
Okay, I understand that in both scenarios the friction is static because the point of position relative to the wheel and ground doesn't change (due to the nature of rolling motion)
The answer for #224 was B. The answer for #225 was A. I'm having trouble trying to understand which direction friction points. Also, why does the direction of friction change?
Thanks.