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Additional Physics > Forces > Flashcards

Forces Flashcards

0
Q

What can the force change on an object?

A

Motion or state of rest

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1
Q

What are forces measured in

A

Newtons

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2
Q

When two objects interact they always do what

A

Always exert equal and opposite forces on each other

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3
Q

What are the two things forces have

A

Size and direction

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4
Q

Resultant force

A

Single force that is equal to all other forces acting on an object

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5
Q

When the resultant force on an object is zero:

A

The object us at rest

The object is moving at the same speed and direction

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6
Q

What is the resultant force of a 4N force and a 3N force acting in the same direction

A

7

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7
Q

Resultant force of an object equation

A

Resultant force = mass multiplied by acceleration

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8
Q

What is the resultant force on a car travelling at a steady speed on a straight horizontal road?

A

Zero

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9
Q

Stopping distance

A

Distance travelled during the drivers reaction time and under the breaking force

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10
Q

Thinking distance is increased if what

A

Driver alcohol or tired

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11
Q

Breaking distance can be increased by

A

Bad roads
Bad weather
Condition of car

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12
Q

Reaction time depends on

A

Driver

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13
Q

Braking distance depends on

A

Road

Weather conditions and vehicle condition

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14
Q

Weight of an object

A

Force of gravity on it

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15
Q

Calculation for gravity weight

A

Weight = mass multiplied by acceleration due to gravity

16
Q

Gravitational field strength

A

If object is on earth and not falling

17
Q

Drag force

A

Resists object

18
Q

Terminal velocity

A

Constant velocity

19
Q

What can drag force also be called

A

Fluid resistance air resistance

20
Q

Hooke’s law

A

Extension is directly proportional to the force applied if the limit of proportionality is not exceeded

21
Q

Equation for Hooke’s law

A

Force applied= spring constant multiplied by extension

22
Q

A spring has a spring constant of 30N/m. If the extension is 0.30 what is the force applied

A

30 multiplied by 0.30 = 9N

23
Q

How can we tell a spring has exceeded it’s limit of proportionality

A

The straight line on a graph of extension curves

24
Q

Fuel economy

A

Reducing the speed of a vehicle reduces amount of fuel used to travel a particular distance

25
Q

Why does making a vehicle more streamlined improve the fuel economy

A

As it reduces the air resistance

Additional Physics (7 decks)

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