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Science Y9 > 9I - Forces and Motion > Flashcards

9I - Forces and Motion Flashcards

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1
Q

Speed ( KM / H )=

A

Distance ( KM) / Time ( H )

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2
Q

Moments ( NM ) =

A

Force ( N ) x Distance from PIVOT ( M )

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3
Q

Work Done ( J )

A

Force ( N ) x Distance in direction of FORCE ( M )

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4
Q

The main stores of energy are

A

Kinetic , Gravitational Potential , Elastic Potential , Chemical and Thermal

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5
Q

Example of Kinetic energy store

A

Any moving object (car, airplane, e.t.c.)

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6
Q

Example of Gravitational potential store

A

Any object above the ground (holding a book up)

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7
Q

Example of Elastic Potential energy store

A

Any object with a rubber band (Slingshot)

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8
Q

Example of chemical energy store

A

Food, Coal, Batteries

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9
Q

Example of Thermal energy store

A

A radiator

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10
Q

The main energy transfers are

A

Heating , Electrical , Radiation and Mechanical

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11
Q

Example of Heating transfer

A

Friction

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12
Q

Example of electrical transfer

A

plugging in a socket

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13
Q

Example of radiation transfer

A

turning on a light

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14
Q

Example of mechanical transfer

A

steam or fuel in a car

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15
Q

Accelerate

A

get faster

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16
Q

Upthrust

A

a force that acts upwards

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17
Q

Friction

A

-A force that acts between two things touching
-Can be reduced by two smooth surfaces and lubricants

18
Q

Air resistance

A

a force that acts to slow down things moving through the air

19
Q

Water resistance

A

a force that acts to slow down things moving through the water

20
Q

Resultant

A

The difference between the forces in one direction and the opposite direction

21
Q

Balanced Forces

A

when all the forces in one direction are exactly the same size as the forces in the opposite direction

22
Q

Weight

A

A downwards force caused by gravity

23
Q

Unbalanced forces

A

-Can change the speed or direction of movement of an object
-When forces acting in opposite directions aren’t the same length

24
Q

Drag

A
  • Another name for resistance (Any kind)
  • Usually acts to slow down or stop moving objects
25
Q

Balanced forces affect objects by:

A
  • keeping them stationary
  • moving an object with constant speed
26
Q

Renewable source:

A

Renewable resources are an energy source that cannot be depleted and are able to supply a continuous source of clean energy. Can it replenish itself in a lifetime?

27
Q

Non-renewable source:

A

A non-renewable resource is a natural resource that cannot be readily replaced by natural means at a pace quick enough to keep up with consumption.

28
Q

Class 1 Lever

A

Load is on the other side of a pivot

29
Q

Example of a class 1 lever

A

Seesaw

30
Q

Class 2 lever

A

Load is ‘inside’ the effort

31
Q

Example of a class 2 lever

A

Wheelbarrow

32
Q

Class 3 Lever

A

Load is ‘outside’ the effort

33
Q

Example of class 3 lever

A

Biceps

34
Q

Moment

A

A turning force

35
Q

Work done

A

energy transferred

36
Q

Relative Speed

A

The speed of one object in relation to another

37
Q

How to find relative speed

A

-If in same direction, ADD
-If in opposite directions, SUBTRACT

38
Q

Pulleys

A

A simple machine that can change the applied force of the work done

39
Q

Simple Machine

A

A mechanical device that changes the direction or size of the force in order to make the task easier

40
Q

How do pulleys work

A

They change the direction of force, making it much simpler for us to move objects. They increase mechanical advantage.

41
Q

Energy efficiency

A

-When the energy is used more than wasted.
-When less energy is used to perform the same task

Science Y9 (3 decks)

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