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Science Revision > Forces and Motion > Flashcards

Forces and Motion Flashcards

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1
Q

What are forces measured in?

A

Newtons (N)

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2
Q

What are the 3 things forces can make objects do?

A

Change speed, Change direction and Change shape

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3
Q

What do balanced forces produce?

A

No change in movement

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4
Q

Unbalanced forces…….

A

Change the speed/direction of moving objects

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5
Q

What is the speed calculation?

A

Speed = distance/time

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6
Q

Friction definition?

A

A force which opposes motion when 2 surfaces come into contact

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7
Q

Advantages of friction?

A

Allows things to start and stop

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8
Q

Disadvantages to friction?

A

Slows you down - wastes energy

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9
Q

Streamlined definition?

A

Able to travel through water or air without much resistance

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10
Q

Air resistance definition?

A

When you come into contact with air particles

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11
Q

What does friction produce?

A

Thermal energy

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12
Q

3 examples of magnetic items?

A

Iron (steel), Nickle and Cobalt

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13
Q

Opposites…

A

Attract

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14
Q

Like…

A

Repel

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15
Q

Water-resistance definition?

A

When a solid and liquid come into contact

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16
Q

Drag definition?

A

The forces slowing down an object in water or air

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17
Q

Pivot definition?

A

The point around which rotation happens

18
Q

Moment definition?

A

The turning effect of a force

19
Q

Moment calculation?

A

Moment = force x perpendicular distance

20
Q

Pressure definition?

A

How much force is put on a certain area

21
Q

Pressure calculation?

A

Pressure = force/area

22
Q

What is pressure measured in?

A

N/m2 (newton/metre2) or Pasclas (Pa)

23
Q

Upthrust definition?

A

The force which allows objects to float

24
Q

Average speed calculation?

A

Total distance ÷ total time

25
Q

Acceleration definition?

A

The rate of change of velocity

26
Q

Acceleration calculation?

A

Change in velocity ÷ time taken

27
Q

Speed definition?

A

The rate of movement or how fast something is moving

28
Q

Relative motion definition?

A

The speed of something compared to the observer

29
Q

Calculation for relative speed when two objects when moving in the same direction?

A

Fastest speed - slowest speed

30
Q

Calculation for relative speed when two objects when moving in the opposite direction calculation?

A

Object 1’s speed + object 2’s speed

31
Q

Resultant force definition?

A

Total force

32
Q

What does drag act on?

A

Fluids - liquids and gasses

33
Q

How to work out resultant force when two forces acting in the same direction?

A

The sum of all the forces

34
Q

How to work out resultant force when two forces acting in the opposite direction?

A

The difference between the forces

35
Q

No resultant force is known as?

A

Equilibrium

36
Q

Resultant force calculation? (Newtons 2nd law)

A

Resultant force = mass x acceleration

37
Q

What is used to display a force?

A

Arrows - Vectors

38
Q

Balanced forces when moving?

A

Stays at a constant speed going the same direction

39
Q

Balanced forces when stationary?

A

Stays stationary

40
Q

Moment formula?

A

Force x distanced

Nxm = Nm

Science Revision (2 decks)

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