Deformation — Science definition

Change in an object’s shape.

Where it is taught

Questions using deformation

Problem 1

Why is an afterward photograph insufficient to detect temporary deformation?
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

Illustrative matched-cart tests show bumper thickness 15 mm before, 8 mm during and 15 mm afterward; peak force is 12 N rather than 24 N for a rigid stop. Explain the temporary deformation and compare peak values without declaring all collisions safe.
Answer and explanation

The bumper undergoes elastic deformation in this simplified record because it regains its thickness. The padded peak is half the rigid-stop peak under matched conditions. Deformation can allow a longer stopping interval, but the readings do not prove that every object is protected or give the entire force–time history. Energy is redistributed rather than erased.

The bumper undergoes elastic deformation in this simplified record because it regains its thickness. The padded peak is half the rigid-stop peak under matched conditions. Deformation can allow a longer stopping interval, but the readings do not prove that every object is protected or give the entire force–time history. Energy is redistributed rather than erased.

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

A bumper is 12 mm thick before contact, 7 mm during and 11 mm after. Explain what the record supports about temporary and remaining deformation and what it cannot establish about force.
Hints

Distinguish the observed quantities, the proposed mechanism and its conditions.

Answer and explanation

It compresses 5 mm temporarily and retains a 1 mm thickness change after the recorded interaction. It does not fully recover in that record. Thickness alone does not establish a peak force or permanent behavior over all later times; a suitable force/time record and longer observation are needed.

It compresses 5 mm temporarily and retains a 1 mm thickness change after the recorded interaction. It does not fully recover in that record. Thickness alone does not establish a peak force or permanent behavior over all later times; a suitable force/time record and longer observation are needed.

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