Page 16 - E book prim 4
P. 16

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.

                                        16
   11   12   13   14   15   16   17   18   19   20   21