leah watches a toy car move across a table at a constant speed. the car moves across the table in one direction and falls off the other side.

leah decides to try another situation. she watches the car move across the table at a constant speed, then when it reaches the other side of the table, her friend joey pushes the car in the other direction. the car moves back to leah.

based on leahs informal experiment, the car changes direction because of ______ force, which happens when ______.

a. an unbalanced; joey pushes the car
b. an unbalanced; leah watches the car
c. a balanced; the car moves across the table
d. a balanced; joey pushes the car

Question

leah watches a toy car move across a table at a constant speed. the car moves across the table in one direction and falls off the other side.

leah decides to try another situation. she watches the car move across the table at a constant speed, then when it reaches the other side of the table, her friend joey pushes the car in the other direction. the car moves back to leah.

based on leahs informal experiment, the car changes direction because of ______ force, which happens when ______.

a. an unbalanced; joey pushes the car
b. an unbalanced; leah watches the car
c. a balanced; the car moves across the table
d. a balanced; joey pushes the car

Accepted Answer

{ "quality": "clear", "question_count": 1, "skills_matched": [ "step_cot", "multiple_choice_formatter", "explain_then_answer", "tutor", "mastery_adaptive_brevity" ], "needs_drawing": false, "concepts_used": [ "Balanced and Unbalanced Forces" ], "new_concepts": [], "current_concepts": [ "Balanced and Unbalanced Forces", "Newton's First Law" ] } ## Analyze the physical scenario Using the *Balanced and Unbalanced Forces* knowledge point $$ \begin{aligned} &\vec{v}_{\text{initial}} = v \hat{i} \quad (\text{constant speed}) \implies \vec{F}_{\text{net}} = 0 \quad (\text{balanced forces})\ &\vec{v}_{\text{final}} = -v \hat{i} \quad (\text{opposite direction}) \implies \Delta\vec{v} e 0 \implies \vec{a} e 0\ &\vec{F}_{\text{net}} = m\vec{a} e 0 \implies \text{forces are unbalanced} \end{aligned} $$ ## Identify the cause of the change in motion Using the *Balanced and Unbalanced Forces* knowledge point $$ \begin{aligned} &\text{Cause of } \vec{F}_{\text{net}} e 0: \text{Joey's push on the car}\ &\text{First blank: "an unbalanced"}\ &\text{Second blank: "Joey pushes the car"} \end{aligned} $$

(A) an unbalanced; Joey pushes the car

(B) an unbalanced; Leah watches the car

(C) a balanced; the car moves across the table

(D) a balanced; Joey pushes the car

{ "subject": "Natural Science", "question_type": "Multiple Choice", "knowledge_point": [ "Natural Science", "Physics", "Forces and Motion" ] }

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QUESTION IMAGE

Question

Explanation:

Analyze the physical scenario

Identify the cause of the change in motion

Answer: