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Questions and Answers
What characterizes a head-on collision?
What characterizes a head-on collision?
- Momentum is not conserved.
- Colliding bodies move at different angles.
- Kinetic energy is always conserved.
- Velocities are confined to the same straight line. (correct)
Which statement is true about elastic collisions?
Which statement is true about elastic collisions?
- Both momentum and kinetic energy are conserved. (correct)
- Forces involved are always non-conservative.
- They are always perfectly inelastic.
- They result in maximum kinetic energy loss.
What happens during a perfectly inelastic collision?
What happens during a perfectly inelastic collision?
- Momentum is not conserved.
- Kinetic energy is conserved.
- The bodies stick together after collision. (correct)
- The colliding bodies bounce off each other.
In which type of collision is kinetic energy not conserved?
In which type of collision is kinetic energy not conserved?
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How are oblique collisions different from head-on collisions?
How are oblique collisions different from head-on collisions?
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What describes the line of impact during a collision?
What describes the line of impact during a collision?
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In what situation is momentum conserved but kinetic energy is not?
In what situation is momentum conserved but kinetic energy is not?
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Which scenario exemplifies an oblique collision?
Which scenario exemplifies an oblique collision?
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Study Notes
Collisions
- Interactions between bodies that involve an exchange of momentum within a short period.
- Bodies may come into contact or not, for example, a particle scattering off a nucleus due to repulsion.
Types of Collisions by Motion
- Head-on/One-dimensional Collision: Bodies' velocities are confined to the same straight line before and after.
- Oblique Collision: Velocities are not confined to the same line, can be two or three-dimensional.
Types of Collisions by Energy Conservation
- Elastic Collision: Momentum and kinetic energy are conserved. Forces are conservative. Examples include atomic particle collisions.
- Inelastic Collision: Momentum is conserved, but not kinetic energy. Forces are non-conservative. Example: collisions between vehicles.
- Perfectly Inelastic Collision: Colliding bodies stick together after collision, moving as a single unit. Maximum kinetic energy loss. Example: bullet embedded in a block.
Line of Impact
- The line passing through the common normal to the surfaces in contact during impact.
- The collision force acts along this line on both bodies.
- Example: balls A and B approaching along line CD, the line CD is the line of impact.
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