9a)The weight of a body is the gravitational force acting on the body.
b1)-The weight of the father is heavier than the boy.
- The buoyant force act on the father is more than the boy.
2- When the water displaced increase,the buoyant force increases.
-When the weight of water displaced increases,the buoyant force also increases.
3-Arcimedes' Principle.
C) When the wooden block is submerged in water,the buoyant force is greater than the weight.
Hence,the buoyant force pushes the block upwards.
-This occurs until the block reaches the surface WHen the weight of water displaced,the buoyant force decrease and becomes equal to the weight of the block causing it to float.
D)1-streamline Shape:to reduce water friction.
2)-Light material: use Light materials like bamboo to make it float
.
3)-large size raft: easier to accomodate participants.
4)-Tie the bamboo: Tie the bambooin layers.put motor at the end of the raft to increase the speed of raft.
No comments:
Post a Comment