MechOneSecB

Question 1

Friction occurring at surface

Answer 1

vvvv W (Weight)
^^^   Rn (Normal Reaction)
<<<  F (Frictional Force)
>>>  P (Applied Force)
>>> Motion

Question 2

P (Applied Force) and F (Frictional Force) effected by Rn or weight increasing

Answer 2

P (Applied Force) and F (Frictional Force) increases

Question 3

P (Applied Force) and F (Frictional Force) effected by Rn or weight Decreasing

Answer 3

P (Applied Force) and F (Frictional Force) decreases

Question 4

P (Applied Force) and F (Frictional Force) effected by Co-efficient increases

Answer 4

F (Frictional Force) increases

Question 5

P (Applied Force) and F (Frictional Force) effected by Co-efficient decreases

Answer 5

P (Applied Force) and F (Frictional Force) increases

Question 6

Explain Static Friction 1

Answer 6

Friction at Rest

Requires to non-moving bodies

Question 7

Explain Sliding Friction 1

Answer 7

One object slides over another

2 bodies in reletive motion

Question 8

Explain Rolling Friction 1

Answer 8

One object rolls over another

Resistance to thsi motion is called rolling friction

Question 9

Advantages of friction

Answer 9

Heavy objects can be expected to stay put

Tyres grip while moving up hill

Question 10

Disadvantages of friction

Answer 10

Exert more power to run machines

prevents movement of heavy objects

Question 11

Machine on the moon design

Answer 11

Enclosed Ball bearings

Rollers where possible

Question 12

reduce friction in machine

Answer 12

Use grease regularily

Keep sealed to prevent dust

Question 13

Blowout Bubble?

Answer 13

vvvv W (Weight)
^^^ Rn (Normal Reaction)
«< Motion
»> Motion

Question 14

Explain Static Friction 2

Answer 14

REquires more force to get moving than to maintain motion

Question 15

Explain Sliding Friction 2

Answer 15

REquires more force to get moving than to maintain motion

Question 16

Explain Rolling Friction 2

Answer 16

2 bodies in reletive motion

Less friction than other friction types