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Physics GCSE > Application of Forces > Flashcards

Application of Forces Flashcards

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1
Q

What is a force?

A

It can be described as a push or a pull

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2
Q

What happens when a force acts?

A

It will try to move the object or change its shape or size

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3
Q

What is a force measured in?

A

Newtons

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4
Q

What is it when we have more than one force acting on an object?

A

It is the resultant force.
Resultant force = EF = jam of the forces

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5
Q

Four forces that wound act on a plane

A

Lift
Drag Thrust
Weight

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6
Q

What is the limit of proportionality?

A

When a spring has been stretched beyond its elastic limit and will not return to its original length.

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7
Q

What is Hooke’s law?

A

F =ke
F = force
K = spring constant
E = natural length

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8
Q

Hooke’s law ratio

A

F1/F2 = e1/e2

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9
Q

Four uses for compression type springs

A

Clickey pens
Suspension in cars and bikes
Pogo stick
Mattress

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10
Q

What is a moment

A

It is the turning effect of a force around a fixed point called a pivot

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11
Q

How to find the moment

A

M
F D

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12
Q

What is the principle of moments

A

When a body is in equilibrium the sun of the clockwise moments about any point equals the sum of the anticlockwise moments about the same point.
CWM=ACWM

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13
Q

What is reaction forces?

A

When a lever is balanced or in equilibrium the pivot must exert an upward force on the lever in order to support it.

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14
Q

The reaction force does not create a moment or turning effect about the pivot. Why?

A

There is no distance to the pivot because the reaction is on the pivot

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15
Q

What is the centre of mass/gravity

A

The centre of mass of an object is the point where it’s total mass appears to act.

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16
Q

What is pressure and what does it depend on?

A

When a force acts on a object, it exerts pressure on the object. It Depends on the size of the force and on the area over which the force acts.

17
Q

Formula for pressure

A

F
P A

18
Q

What determines how stable the CofG is?

A

Low and wide = more stable

19
Q

How to get the reaction force at the pivot?

A

Add both forces

Physics GCSE (8 decks)

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