Question

do the pre assessment and question 2

Answer 1

Answer:

1)

1)magnetic force

2)frictional force.

3)frictional force.

4)Buoyant force.

2)

• Because they are mechanical devices and they have metal against metal moving parts.

• This means friction occurs.

• Oil or lubricate the points of friction to eliminate the wear on the metal and make the machine function more efficiently and last a longer time.

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Explanation:

hope it helps

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Answer 2

Answer:

Magnetic force and frictional force and buyoant force.