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Physics > Force Moments Work And Power > Flashcards

Force Moments Work And Power Flashcards

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1
Q

A force

A

Anything which cause an object to change its velocity

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2
Q

Velocity

A

Is the speed in a given direction

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3
Q

Forces are measured in

A

Newtons

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4
Q

Push

A

Changes the velocity of an object

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5
Q

Pull

A

Changes the velocity of an object

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6
Q

Weight

A

Moves an object towards the ground

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7
Q

Friction

A

Slows down moving objects

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8
Q

Electric

A

Causes charged particles to move

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9
Q

Magnetic

A

Cause magnetic materials to move

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10
Q

To measure force we use

A

Newton spring balance

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11
Q

Forces always occur in pairs

A

For every force there’s an equal and opposite force

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12
Q

Friction

A

Force that prevents easy movement between two objects in contact

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13
Q

High friction

A

Sand paper car tyres and rough soled shoes

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14
Q

Low friction

A

Wet soap ice and glass

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15
Q

Lubricant

A

Reduces friction

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16
Q

Friction advantages

A

Helps u stop
Brakes on car
Removes rough surface (sandpaper)
Helps u walk - gives grip to stop u slipping keeps u upright
Tyres won’t spin while driving
Rub ur hands to get warm
Hitting flint and steel can make a spark to make a fire
Putting extra grips on shoes stops u slipping on ice
Friction keeps nails in wood stops them from falling out

17
Q

Friction disadvantages

A

Braces cause blisters do to skin being rubbed
Wear down shoes
Carpet burn if u slip
Friction between air and car fuel is wasted trying to move car
Cartilage wears away at the joint = can be painful

18
Q

Force

A

Mass x acceleration

19
Q

Weight

A

Mass x (acceleration due to) gravity

20
Q

Work

A

Is done when a force moves an object

Work(J)= force(N) x distance (m)

Unit of work is joules

21
Q

Power

A

The rate something is done
Unit watt
1watt = 1j/s

22
Q

Hooks law

A

States that the extension of an elastic body (spring) is directly proportional to the force applied to it

23
Q

A straight line graph tells u that

A

The two things on the graph are proportional

Physics (7 decks)

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