(1) resultant forces Flashcards

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1
Q

what can forces change

A
  • the shape of an object
    -its state of rest
    -its motion
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2
Q

give 3 examples of noncontact forces

A

-gravity
-electrostatic energy
-magnetism

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3
Q

give 3 examples of contact forces

A

-friction
-air resistance
-tension

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4
Q

whats the unit of force

A

Newtons

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5
Q

what happens when 2 objects interact

A

they excert an equal and opposite force on eachother

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6
Q

whats friction

A

a force that opposes the motion of any 2 surfaces in contact with eachother when they try to slide past eachother

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7
Q

whats a resultant force

A

a single force that has the same effect as all the forces acting on an obhect

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8
Q

what does newtons1st law of motion state about zero resultant force

A

if the resultant force on an object is 0, the object
-remains at stationary if it was at rest
or
-continues to move at the same speed and direction as it was

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9
Q

if a resultant force is 0 and only 2 forces are acting on the object then..

A

those 2 forces must be equal and act in opposite direction to eachother

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10
Q

what can we conclude when the resultant force is not 0

A

the forces acting on the object arent balanced

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11
Q

hoe do vectors show the force of an object in diagrams

A

each force is reprsented by a vector which is shown as an arrow
-the length of the arrow is proportional to the size(magnitude) and point to the direction

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12
Q

if an object is acted on by 2 unequal forces then the resultant force is..

A

-equal to the difference between the 2 forces
-in the direction of the larger force

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13
Q

what does the parallelogram of forces show us

A

the resultant forces of 2 forces that dont act on the same line

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14
Q

what are scalars

A

quantities that have ONLY a magnitude(size)

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14
Q

whatre vector quantities and how are they represented

A

vectors have both direction and magnitude(size)
theyre represented by arrows. the length of an arrow shows the magntiude and the direction its pointing at shows us direction

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14
Q

define weight

A

the force of gravity on an object due the gravitational attraction between the object and the earth

15
Q

whats the unit for weight and mass

A

weight- Newtons
mass- Kg

16
Q

whats the formula that relates weight,mass and gravitaty

A

w=mg
where w is weight in newtons
m is mass in kg
and g is gravitational field strength in N/Kg

17
Q

when can we call an object elastic

A

if it returns to its original shape after you remove the force deforming it

18
Q

whats an extention and how can you calculate it

A

an increase in length of a stretched material from its original length, its calculated each time a weight is added
extention=stretched length-original length

19
Q

whats the relationship between spring extentions and the force applied to it

A

theyre directly proportional, as long as limit of proportionallity(stretched beyond its limit) isnt exceeded

20
Q

whats the equation for hookes law

A

force=spring constant X extension

21
Q

what happens when an elastic object is stretched

A

elastic potential energy is stored in the object because work is done on the object by the stretching force