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Delta Modern Language Schools
Science department
Grade 4
1st term 2024-2025

Unit (2) concept (3)

Energy and collision

Collision is:

The moment when two objects hit or crash into each other.

A fast-moving object A slow-moving
object.
It has more energy
It has less energy
When it hits another object, it exerts
more force. When it hits another object, it exerts
lessforce
This force causes a big damage to the
other object and can't be repaired This force causes a less damage than
thefast-moving object.

 By increasing the speed of an object the kinetic energy increases.

 The speed of the moving object on a ramp increases by increasing its mass and then
the kinetic energy of this object increases.

 The airbags absorb the energy of the car due to its collision.

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