Question

plz answer all questions
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Answer 1

Answer:

1. frictional force
2. a)push and b)pull (ii)b one requires less effort
3. 1-b,2-a,3-d,4-c
4. i)c,ii)a,iii)b,iv)b
5. Three example that show force of friction is desirable. 1)There is a design under our shoes which helps to reduce fiction. 2)when we write on a blackboard with chalk. 3)when we hang our bags on our sholders.

Explanation:

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Answer 2

Answer:

1) The ball moving is Rolling frictional force.

2) Sliding frictional force and rolling frictional force respectively . Rolling Frictional force require less efforts.

3) i : b

ii : a

iii : d

iv : c

4) i : (c)

ii : (a)

iii : (c)

iv : (b)

5) i) The grip of the handle of vehicles .

ii) The stripes on the vehicle tire .

iii) The pattern underneath our shoes.

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