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Chapter 36 > Force And Work > Flashcards

Force And Work Flashcards

1
Q

What is force

A

Something that causes an object to accelerate (negative or positive)

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2
Q

What is the unit and how is it measured

A

Newton (N) and measured with Newton meter

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3
Q

What is the effect of pushing

A

Moves or increases speed or changes direction ex. Child on swing

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4
Q

What is the effect of pulling

A

Moves or increases speed or changes direction ex. Pulling of a boot

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5
Q

What is the effect of weight

A

Moves object towards the centre of the earth ex.a ball falling

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6
Q

What is the effect of friction

A

Slows object moving over each other ex.brakes on a bicycle

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7
Q

What is the effect of tension

A

Moves object on pulleys or stops a body from falling ex.light suspended from the ceiling

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8
Q

What is the effect of reaction

A

Supports or balances weight ex.book resting on a table

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9
Q

What is the effect of stretching

A

Changes shape of object ex.stretching an elastic band

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10
Q

What is the effect of twisting

A

Causes rotation ex.opening a cap of a bottle

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11
Q

What is the effect of compression

A

Changes shape of object ex.sitting on a cushion

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12
Q

What is the effect of magnetic

A

Moves magnetic materials ex.picking up iron in swap yard

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13
Q

What is the effect of electric

A

Moves charged particles ex.positive charges attracting negative

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14
Q

What is weight and how is it measured

A

Force of gravity on an object (mass x 10) 0.4kg x 10=4N

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15
Q

What is friction

A

Force which opposes motion between two objects in contact

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16
Q

Name the disadvantages

A
  • slows things down
  • waste of energy
  • wears away surfaces in contact with each other
17
Q

Name the advantages

A
  • stop or slow things down
  • allow things to move (walking)
  • pick things up (fingers)
18
Q

What is a lubrication

A

Oil used in engines to reduce friction ex.synorical fluids acts as friction in joints

19
Q

What is Hooke’s law

A

The extension of a spring is directly proportional to the force that is stretching it

20
Q

What is work and the unit

A

When a force moves an object, force x distance moved, joules (j)

21
Q

What is energy

A

Ability to do work (joules)

22
Q

What is power and how to calculate it

A

Work done per unit time, work done : time taken, watt(W)

Chapter 36 (2 decks)

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