Collisions, Deformation & Changes in Motion — Drills · Grade 8 Science
Chapter: MotionWhat these drills covers
By the end of Collisions, Deformation & Changes in Motion you should be able to:
- I can use before–during–after records to explain temporary and remaining deformation.
- I can compare matched collision records using force, mass, motion and energy with stated limits.
4 questions, written answer, each with a worked explanation.
Vocabulary used: collision, deformation, elastic deformation, permanent deformation, peak force, model, evidence, system boundary, assumption.
Problem 1
Answer and explanation
An object can deform during contact and then recover. The after-image does not show the complete time sequence.
An object can deform during contact and then recover. The after-image does not show the complete time sequence.
Response criteria
- Use the supplied conditions and relevant evidence.
- Explain the scientific mechanism or calculation.
- State a meaningful limitation or testable next step.
Problem 2
Answer and explanation
No. Equal interaction forces can cause different acceleration because masses differ, and net-force calculations must account for other forces.
No. Equal interaction forces can cause different acceleration because masses differ, and net-force calculations must account for other forces.
Response criteria
- Use the supplied conditions and relevant evidence.
- Explain the scientific mechanism or calculation.
- State a meaningful limitation or testable next step.
Problem 3
Answer and explanation
No. It influences motion energy, but material response, geometry and how the object stops also affect damage.
No. It influences motion energy, but material response, geometry and how the object stops also affect damage.
Response criteria
- Use the supplied conditions and relevant evidence.
- Explain the scientific mechanism or calculation.
- State a meaningful limitation or testable next step.
Problem 4
Answer and explanation
Lower measured peak force for this padded setup under the stated matched conditions. They do not certify every pad or establish identical average forces or injury protection.
Lower measured peak force for this padded setup under the stated matched conditions. They do not certify every pad or establish identical average forces or injury protection.
Response criteria
- Use the supplied conditions and relevant evidence.
- Explain the scientific mechanism or calculation.
- State a meaningful limitation or testable next step.