Reactor

first i created two boxes, raised and rotated one of them so that when it fell during the animation it would be more interesting. then converted them both to rigid body collection

then changed the mass of the falling block to 20 so that when i animated it the block falls
the animation shows how the block falls to the ground, and how the angles cause it to roll when it hits the ground

after this i edited the friction and elasticity of the both block changing the friction to 0 and elasticity to 5
this caused the block to bounce when it the other block so that each time it landed it gained height and span in the air

i further developed on this by creating a bowling animation, i imported objects to form a bowling alley
again converting everything to rigid body collection, giving the pins a mass of 10, and the ball a mass of 20
after doing this the when previewing the animation the pins jumped off the boards because of the tolerance was too high(minimum distance between 2 objects) so i decreased this to 0.6

i then used the auto key tool, dragging the time line to five, moving the ball towards the pins. i attempted to rotate the ball, but the pivot point was in the centre of the scene, so i went to the hierarchy tab, clicked on affect pivot point only, then centre to object, then going back and rotating the ball to give it spin.

when i tried to preview the animation, but the ball just droped because i had forgotten to start the animation at frame 2 which meant that the ball had no momentum.

after fixing this it worked well, but did not look very realistic as the ball went in a straight line, so i added some side rotation to give the ball a slight curve as it moved towards the pins