FM1 - Forces and friction Flashcards

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1
Q

What is a force?

A

A push or a pull

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2
Q

Where does the force of gravity and weight act?

A

Straight downwards

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3
Q

Where does a reaction force from a surface act?

A

Straight upwards

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4
Q

Where does electrostatic forces act?

A

Between two charged objects - direction depends on type of charge

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5
Q

Where does thrust (push/pull) act?

A

When something is speeding up

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6
Q

Where do drag/air resistance/friction do?

A

Slow down objects

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7
Q

How can lift be caused?

A

Due to an aeroplane wing

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8
Q

How can tension be causes?

A

Due to a rope or cable

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9
Q

What are the opposite forces for the ones acting on our body;

  • Reaction
  • Thrust
A
  • Reaction = gravity

- Thrust = Drag

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10
Q

What does friction oppose?

A

Motion - if an object has no force moving it, friction always slows it down

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11
Q

If you travel at a steady speed, what always need to counteract friction?

A

A driving force

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12
Q

What are the three ways that friction can occur?

A
  • Friction between solid surfaces which are gripping
  • Friction between solid surfaces sliding last each other
  • Resistance from fluids (liquids or gases)
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13
Q

How can you reduce friction when solid objects are gripping or sliding past each other?

A

Put lubricants like oil or grease between the two surfaces to prevent the wear of the two surfaces in contact

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14
Q

How can you reduce resistance from fluids eg air?

A

Keep objects streamlined like sports cars or put deflectors on them like what lorries and caravans have

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15
Q

What spoils the streamlined shape on cars?

A

Roof boxes

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16
Q

For a given thrust, the higher the drag…

A

The lower the top speed of a car - opposite to this is s parachute

17
Q

In a fluid as speed increases, what else’s increases?

A

Friction