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Science > Forces > Flashcards

Forces Flashcards

1
Q

What is a force?

A

anything that can cause an object to start moving or changing direction

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2
Q

What is the unit of force?

A

Newtons (N)

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3
Q

What instruments measure force?

A

Newton meter or a Force sensor

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4
Q

What is friction?

A

a force that opposes motion between 2 objects in contact.

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5
Q

What are some disadvantages of friction?

A
  • Slows things down
  • Wastes energy
  • Causes wear e.g. shoes, tires
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6
Q

What are some advantages of friction?

A
  • Allows breaks to be used
  • allows you to move
  • Slows down hailstones and rain
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7
Q

What does Hooke’s Law state?

A

the extension of a spiral spring is proportional to the applied force

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8
Q

What is an elastic limit?

A

the point where a spiral spring will not return to its natural state

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9
Q

What is mass?

A

the amount of matter in a substance

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10
Q

What is weight?

A

The measure of the force of gravity on a body

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11
Q

What is mass measured in?

A

Kilogram (Kg)

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12
Q

What is weight measured in?

A

Newton (N)

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13
Q

What instrument measures mass?

A

A mass balance

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14
Q

What instrument measures weight?

A

A newton meter

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15
Q

What are some differences between mass and weight?

A
  • Mass remains constant everywhere in the universe while weight depends on the amount of gravity in that location.
  • Mass: Kg Weight: N
  • Mass: mass balance Weight: Newton meter
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16
Q

What is the equation to calculate the weight of an object?

A

Mass (Kg) X Acceleration due to gravity (m/s²)

17
Q

What does stationary mean?

A

Not moving

18
Q

What does accelerate mean?

A

Speed up

19
Q

What does decelerate mean?

A

Slow down

20
Q

What is net force?

A

The total force acting on an object when all forces are added up.

21
Q

What is a magnet?

A

A piece of metal that attracts other materials.

22
Q

What is a magnetic field?

A

the space around a magnet that exerts force on magnets and magnetic materials.

23
Q

`What does friction depend on?

A

The type of surface or the motion between the 2 objects in contact

24
Q

How can you reduce friction?

A

⇒Reduce how bumpy the surface is e.g. lubrication, sandpaper.
⇒Ball bearings
⇒Streamlining

Science (31 decks)

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