The Life Starter
Sign up
Grade 11 · unit review

Review: Kinematics and Force Models

Analyze changes of motion using signed quantities and stated assumptions.

Download reviews and answer keys

Bring the unit skills together

Use these 4 new cases to check your reasoning. Choices are temporary and are not saved to an account, sent to staff or recorded as school grades. Download your current review choices before leaving or reloading.

Unit review questions
1. Supplied case 5: final velocity (m/s)=-2; initial velocity (m/s)=4; elapsed time (s)=3, using the explicitly named quantities. Acceleration equals final velocity minus initial velocity, divided by elapsed seconds. What result follows?
Need a hint?
  • Acceleration equals final velocity minus initial velocity, divided by elapsed seconds.
  • Acceleration can be negative while speed increases in a negative direction.
2. Supplied case 5: mass (kg)=8; signed acceleration (m/s²)=2, using the explicitly named quantities. Net force equals mass in kilograms multiplied by signed acceleration in meters per second squared. What result follows?
Need a hint?
  • Net force equals mass in kilograms multiplied by signed acceleration in meters per second squared.
  • A newton is kg·m/s².
3. Supplied case 5: initial velocity (m/s)=5; signed acceleration (m/s²)=1; elapsed time (s)=2, using the explicitly named quantities. Displacement equals initial velocity times seconds plus one-half acceleration times seconds squared. What result follows?
Need a hint?
  • Displacement equals initial velocity times seconds plus one-half acceleration times seconds squared.
  • Use displacement, not automatically path length.
4. Which scientific label fits the specifically described step or feature? Supplied case: Earth pulls on cart.
Need a hint?
  • Look for the described feature: force acting on chosen body from surroundings.
  • Compare the given mechanism with the other labels; do not infer unmentioned events.

The download contains your current choices and any checked feedback. Keep the separate transfer-task work in your own document; downloading its instructions does not mark it complete.

Use the skills in a new task

Create a four-panel explanation for “Kinematics and Force Models” using one supplied case from each lesson. Include the observation, scientific mechanism or calculation, result and a limitation. You may draw and speak your explanation; all inputs are supplied.

Work on paper or in your own document. Explain the choices you made.

  • Use one supplied case from each of the four lessons.
  • Name the relevant structure, quantity or process in every panel.
  • Show calculations with units or a causal evidence chain.
  • Distinguish source facts from fictional classroom data.
  • State a model limit or a condition that would change the result.
Compare with a model response

Panel 1: Supplied case 1: final velocity (m/s)=12; initial velocity (m/s)=4; elapsed time (s)=2, using the explicitly named quantities. Acceleration equals final velocity minus initial velocity, divided by elapsed seconds. What result follows? Result: 4 m/s². Reasoning: Substitute the supplied values: ((12)-(4))/(2) = 4 m/s². Keep final minus initial order. Use the stated coordinate direction. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 2: Supplied case 1: mass (kg)=2; signed acceleration (m/s²)=3, using the explicitly named quantities. Net force equals mass in kilograms multiplied by signed acceleration in meters per second squared. What result follows? Result: 6 N. Reasoning: Substitute the supplied values: (2)*(3) = 6 N. Use net force rather than a single force when others act. Keep acceleration’s sign. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 3: Supplied case 1: initial velocity (m/s)=2; signed acceleration (m/s²)=1; elapsed time (s)=4, using the explicitly named quantities. Displacement equals initial velocity times seconds plus one-half acceleration times seconds squared. What result follows? Result: 16 m. Reasoning: Substitute the supplied values: (2)*(4)+0.5*(1)*(4)*(4) = 16 m. Square the time in the acceleration term. Constant acceleration is an explicit assumption. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 4: A cart-only free-body diagram includes the floor’s force on the cart. Should the cart’s force on the floor also cancel it there? Which inference or prediction is best supported? Result: No; the reaction acts on the floor, a different body.. Reasoning: Net force sums forces on the chosen body; paired interaction forces act on different bodies. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.