Physics Force & Motion UHS 2023
PMDC Verified Question 27 of 137
On which car there is resultant force?
A
Car moving on a straight horizontal road
B
Car moving at constant around a bend
C
Car moving uphill at constant velocity
D
Car that is stationary
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Car moving at constant around a bend
Concept:

A net resultant force is strictly required to produce an acceleration (Newton's Second Law). Acceleration occurs if either speed OR direction changes.

Solution:

  • A car moving around a bend is constantly changing its direction of travel.


  • Because velocity is a vector, this continuous change in direction constitutes an acceleration, even if the speedometer (speed) remains constant.


  • To create this centripetal acceleration, a resultant force (friction from the tires) must be acting toward the center of the bend.


Why other options are incorrect:

Stationary cars, or cars moving straight ahead at constant velocity (horizontal or uphill), have strictly zero acceleration. Thus, their resultant net force is zero.

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