science deck Flashcards

1
Q

Give three examples of contact and non-contact forces

A

Contact:

  • Friction
  • Reaction
  • Air resistance

Non-contact:

  • Magnetism
  • Gravity
  • Lift
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2
Q

What are balanced forces?

A

Forces that are the same size in the OPPOSITE direction

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3
Q

What is a force?

A

A push or a pull

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4
Q

Can you see a force?

A

No

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5
Q

What unit is force measured in?

A

Newtons

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6
Q

What can be used to measure forces?

A

A Newtonmeter

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7
Q

A 300N force to the left and a 300N force downward is applied, are these balanced?

A

No.

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8
Q

What happens to the air resistance as speed is increased?

A

It is also increased

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9
Q

What is a resultant force?

A

The force acting overall on an object and specifies a direction.

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10
Q

What is the formula for speed?

A

Speed=distance/time

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11
Q

If the question doesn’t specify, what should be the default units for SPEED, DISTANCE and TIME?

A

Speed: m/s
Distance: metres
Time: seconds

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12
Q

What is the speed-distance-time triangle?

A

/d\
/—–\
/s | t \
dem keyboard skills doe

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13
Q

If there is a straight line on a distance-time graph, what does it show?

A

The object is stationary.

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14
Q

How do you calculate the speed of an object based on a distance-time graph?

A

You get the change in y axis and divide it by the x axis

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15
Q

Line A & B are two lines, Line B is steeper, which line shows the object at a faster speed?

A

Line B

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16
Q

What is the difference between speed and veloctiy?

A

Speed just shows how fast something is going whilst veloctiy specifies the direction

17
Q

If the velocity of an object is -1m/s, which direction is it travelling in?

A

Backwards

18
Q

What is the equation for pressure?

A

Force/surface area

19
Q

What is 1 Pa equal to?

A

1N/m^2

20
Q

What is the name of a fixed point that an object roates around?

A

A pivot

21
Q

What is the equation for a moment?

A

Distance from pivot * force

22
Q

What unit of force are moments measured in?

A

Newton metres (Nm)

23
Q

When are moments balanced?

A

When the clockwise and anti-clockwise moments are equal

24
Q

What is a spring constant measured in?

A

Nm^-1