Describe Motion Clearly - Middle School Physical Science
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What is Newton’s second law written as a formula?
What is Newton’s second law written as a formula?
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Net force $F_{net} = ma$. Force equals mass times acceleration.
Net force $F_{net} = ma$. Force equals mass times acceleration.
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What is the SI unit for time used in motion problems?
What is the SI unit for time used in motion problems?
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Second (s). Base SI unit for measuring duration.
Second (s). Base SI unit for measuring duration.
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What is a reference frame in motion descriptions?
What is a reference frame in motion descriptions?
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A chosen viewpoint (origin and direction) used to measure motion. Establishes position and direction for consistent measurements.
A chosen viewpoint (origin and direction) used to measure motion. Establishes position and direction for consistent measurements.
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What is the SI unit for distance commonly used in motion problems?
What is the SI unit for distance commonly used in motion problems?
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Meter (m). Standard international unit for measuring length.
Meter (m). Standard international unit for measuring length.
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Find and correct the unit error: speed is reported as $15,\text{m/s}^2$.
Find and correct the unit error: speed is reported as $15,\text{m/s}^2$.
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Correct unit: $15,\text{m/s}$. Speed uses $\text{m/s}$, not acceleration units.
Correct unit: $15,\text{m/s}$. Speed uses $\text{m/s}$, not acceleration units.
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Find the net force when $10,\text{N}$ east and $6,\text{N}$ west act on an object.
Find the net force when $10,\text{N}$ east and $6,\text{N}$ west act on an object.
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$4,\text{N}$ east. Subtract opposing forces: $10-6=4$.
$4,\text{N}$ east. Subtract opposing forces: $10-6=4$.
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Find the net force if $m = 5,\text{kg}$ and $a = 2,\text{m/s}^2$.
Find the net force if $m = 5,\text{kg}$ and $a = 2,\text{m/s}^2$.
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$10,\text{N}$. Apply Newton's second law $F = ma$.
$10,\text{N}$. Apply Newton's second law $F = ma$.
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Find the acceleration if velocity changes from $2,\text{m/s}$ to $8,\text{m/s}$ in $3,\text{s}$.
Find the acceleration if velocity changes from $2,\text{m/s}$ to $8,\text{m/s}$ in $3,\text{s}$.
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$2,\text{m/s}^2$. Use $a = \frac{\Delta v}{\Delta t} = \frac{8-2}{3}$.
$2,\text{m/s}^2$. Use $a = \frac{\Delta v}{\Delta t} = \frac{8-2}{3}$.
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Find the speed if an object travels $12,\text{m}$ in $3,\text{s}$.
Find the speed if an object travels $12,\text{m}$ in $3,\text{s}$.
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$4,\text{m/s}$. Apply $v = \frac{d}{t} = \frac{12}{3}$.
$4,\text{m/s}$. Apply $v = \frac{d}{t} = \frac{12}{3}$.
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Identify the sign of velocity if positive direction is east and the object moves west.
Identify the sign of velocity if positive direction is east and the object moves west.
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Negative velocity. Opposite to positive reference direction.
Negative velocity. Opposite to positive reference direction.
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What is the correct SI unit for acceleration?
What is the correct SI unit for acceleration?
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Meters per second squared $(\text{m/s}^2)$. Velocity change rate has squared time unit.
Meters per second squared $(\text{m/s}^2)$. Velocity change rate has squared time unit.
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What is the correct SI unit for velocity?
What is the correct SI unit for velocity?
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Meters per second $(\text{m/s})$. Combines distance (m) and time (s) units.
Meters per second $(\text{m/s})$. Combines distance (m) and time (s) units.
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Which option best describes balanced forces: net force is $0$ or net force is not $0$?
Which option best describes balanced forces: net force is $0$ or net force is not $0$?
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Net force is $0$. Equal opposing forces cancel out.
Net force is $0$. Equal opposing forces cancel out.
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What is the weight formula for an object of mass $m$ near Earth?
What is the weight formula for an object of mass $m$ near Earth?
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Weight $W = mg$. Where $g \approx 9.8,\text{m/s}^2$ on Earth.
Weight $W = mg$. Where $g \approx 9.8,\text{m/s}^2$ on Earth.
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What does a net force of $0,\text{N}$ imply about an object’s acceleration?
What does a net force of $0,\text{N}$ imply about an object’s acceleration?
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Acceleration is $0,\text{m/s}^2$. From $F=ma$: if $F=0$, then $a=0$.
Acceleration is $0,\text{m/s}^2$. From $F=ma$: if $F=0$, then $a=0$.
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What is the SI unit for force?
What is the SI unit for force?
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Newton (N). Named after Sir Isaac Newton.
Newton (N). Named after Sir Isaac Newton.
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What does displacement mean compared with distance traveled?
What does displacement mean compared with distance traveled?
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Displacement is straight-line change in position with direction. Distance only measures path length, not direction.
Displacement is straight-line change in position with direction. Distance only measures path length, not direction.
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What is acceleration, stated as a formula using velocity and time?
What is acceleration, stated as a formula using velocity and time?
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Acceleration $a = rac{ riangle v}{ riangle t}$. Rate of velocity change over time.
Acceleration $a = rac{ riangle v}{ riangle t}$. Rate of velocity change over time.
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What is velocity, stated in one precise sentence?
What is velocity, stated in one precise sentence?
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Velocity is speed with direction (a vector quantity). Unlike speed, velocity includes directional information.
Velocity is speed with direction (a vector quantity). Unlike speed, velocity includes directional information.
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What is speed, stated as a formula using distance and time?
What is speed, stated as a formula using distance and time?
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Speed $v = rac{d}{t}$. Distance traveled per unit time.
Speed $v = rac{d}{t}$. Distance traveled per unit time.
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Find the average speed if $d=60,m$ and $t=12,s$.
Find the average speed if $d=60,m$ and $t=12,s$.
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$5,m/s$. Apply $v=\frac{d}{t}=\frac{60,m}{12,s}$.
$5,m/s$. Apply $v=\frac{d}{t}=\frac{60,m}{12,s}$.
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Find the acceleration if velocity changes from $2,m/s$ to $8,m/s$ in $3,s$.
Find the acceleration if velocity changes from $2,m/s$ to $8,m/s$ in $3,s$.
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$2,m/s^2$. Apply $a=\frac{\Delta v}{\Delta t}=\frac{6,m/s}{3,s}$.
$2,m/s^2$. Apply $a=\frac{\Delta v}{\Delta t}=\frac{6,m/s}{3,s}$.
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State the formula for acceleration using change in velocity and time.
State the formula for acceleration using change in velocity and time.
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$a=rac{
Delta v}{
Delta t}$. Change in velocity divided by change in time.
$a=rac{ Delta v}{ Delta t}$. Change in velocity divided by change in time.
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What is acceleration in terms of velocity and time?
What is acceleration in terms of velocity and time?
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Rate of change of velocity over time. Measures how quickly velocity changes.
Rate of change of velocity over time. Measures how quickly velocity changes.
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What does velocity include that speed does not?
What does velocity include that speed does not?
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Direction. Velocity is a vector quantity; speed is scalar.
Direction. Velocity is a vector quantity; speed is scalar.
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