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GCSE Physics > 9) Forces & Their Effects > Flashcards

9) Forces & Their Effects Flashcards

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1
Q

What is a moment?

A

A moment is the turning effect of a force around a fixed point

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2
Q

How are moments calculated?

A

Moment = force x distance

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3
Q

What distance is used in moments calculations?

A

The perpendicular distance from the pivot

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4
Q

What is force measured in?

A

Newtons (N)

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5
Q

Whare are moments measured in?

A

Newton metres (Nm)

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6
Q

How is an object in equilibrium in linear motion?

A

There must be no resultant force acting on the object and it must be stationary or travelling at a constant speed in a straight line

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7
Q

How is an object in equilibrium in circular motion?

A

The sum of the clockwise and antioclockwise moments acting on the object must be equal, this means the object is not rotating or rotates at a constant speed

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8
Q

What can we use levers and gears to do?

A

Transmit the rotational effect from one place to another

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9
Q

What do levers do?

A

Increase the distance between the pivot and where we’re applying the force

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10
Q

How does the size of gears effect the moment?

A

Sending a force to a larger gear will create a larger moment as the distance to the pivot is greater

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11
Q

What is a force?

A

A push or pull that acts on an object when it interacts with another object

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12
Q

What are the two types of forces?

A

Contact

Non-contact

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13
Q

What are contact force examples?

A

Friction
Air resistance
Tension
Normal contact force

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14
Q

What are examples of non-contact forces?

A

Gravitational force
Electrostatic force
Magnetic force

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15
Q

How is air resistance a contact force?

A

When an object moves through the air it collides with air molecules, slowing it

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16
Q

How is friction created?

A

When two surfaces try to move against each other, tiny bumps in the surface interlock opposing the motion

17
Q

What is an example of normal contact force?

A

When you push on your table it pushes equally on your hand

18
Q

What does friction normally create?

A

Heat

19
Q

What reduces friction?

A

Separating surfaces with a thin layer of oil

20
Q

What are diagrams used to show forces acting on an object called?

A

Free body diagrams

21
Q

What are forces shown as in free body diagrams?

A

Vectors

22
Q

What can we use free body diagrams for?

A

Working out the resultant force of an object

Seeing if an object is in equilibrium

GCSE Physics (14 decks)

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