Question

home : concept builders : newtons laws : which one doesnt belong? force and motion : launch
doesnt belong? force and motion
if youve already done this activity and want to try again (untracked), feel free to replay activity no task tracking
having problems staying logged in or are you experiencing issues? please visit our troubleshooting section for solutions.
one of these representations is not like the others. tap on the one that doesnt belong.
(there are images: a force diagram, a position-time graph, a velocity-time graph, and a text description. also, a progress report panel with student info and progress stars/colors, and buttons: help me!, view directions, to main menu)

Explanation:

Step1: Analyze each representation

• The position - time graph (middle top) shows a linear decrease, implying constant velocity (since slope of position - time graph is velocity) in the negative direction (moving left).
• The velocity - time graph (bottom left) shows a constant negative velocity, meaning the object is moving left with constant velocity.
• The text description (bottom right) says the object is moving left with constant velocity.
• The force diagram (top left) shows balanced forces (arrows of equal length in opposite directions), which would imply the object is either at rest or moving with constant velocity. But wait, no - wait, the other three are about motion (velocity, position - time, description of motion), while the force diagram is about forces. Wait, no, let's re - check. Wait, the force diagram: if forces are balanced (like in the top left, the horizontal and vertical forces? Wait, no, the horizontal arrow (left) and the other horizontal? Wait, no, the top left diagram: there is a left arrow and then up and down arrows (maybe vertical forces balanced, and horizontal force? Wait, no, maybe I misread. Wait, the problem is "which one doesn't belong". Let's re - evaluate.

Wait, the three (position - time graph, velocity - time graph, text) are all about the motion of the object (moving left with constant velocity). The force diagram (top left) is about forces. If the object is moving with constant velocity, the net force should be zero (balanced forces). But the force diagram: let's see, the top left has a left - pointing arrow (maybe a force) and then up and down arrows (maybe weight and normal force, balanced). But the other three are descriptions of motion, while the force diagram is a force representation. Wait, no, maybe the force diagram is the odd one? Wait, no, wait the velocity - time graph: the velocity is constant (horizontal line) in the negative region (moving left). The position - time graph: slope is negative (moving left, constant velocity). The text: moving left with constant velocity. The force diagram: if the object is moving with constant velocity, the net force is zero. But the force diagram has a left - pointing arrow (a force) and then up and down. Wait, maybe the force diagram is the one that doesn't belong because the other three are about the motion (velocity, position - time, description of motion), while the force diagram is about forces acting on the object.

Step2: Identify the odd one

The force diagram (top left) is different from the other three, which are all representations of the object's motion (either through graphs or text description). The other three are consistent with an object moving left with constant velocity, while the force diagram is a free - body diagram (force representation) rather than a motion representation.

Answer:

The force diagram (the top - left diagram with the yellow square and red arrows)