Forces and Motion Ch2 Flashcards

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1
Q

what is the equation for speed

A

distance/ time

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2
Q

what is velocity

A

same thing as speed but includes direction

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3
Q

what is acceleration

A

a change in speed (velocity) in a given amount of time
distance/ time/ time

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4
Q

what is the measurement for gravity

A

9.8 m/s/s or 10m/s/s

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5
Q

what is the unit for force

A

newtons (N)

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6
Q

what is the tool used to measure force

A

newtinmeter

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7
Q

what is Newtons first law of motion

A

if no external forces are acting then the object is either:
A) stationary
B) in constant velocity

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8
Q

describe terminal velocity

A
  • as objects falling increases in velocity the air resistance increases as well
  • eventually the weight=air resistance
  • when this happens the object will no longer accelerate and will reach terminal velocity
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9
Q

what is the meaning of inertia

A

an objects resistance to acceleration and deceleration

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10
Q

what is resultant force

A
  • the net force applied on an object from multiple sources
  • typically seen when 2 forces are acting on an object from opposite directions
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11
Q

what is the equation for force

A

mass (kg) x acceleration (m/s/s)

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12
Q

what is 1 newton

A

1kg moving at an acceleration of 1 m/s/s

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13
Q

what is static friction

A

friction that is present between stationary objects
ag. holding a pen

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14
Q

what is dynamic friction

A

friction created from the movement of objects in constant with each other

it is increased as the speed increases

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15
Q

what is friction

A

when kinetic energy gets converted to thermal energy

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16
Q

air resistance is equal to

A

drag

17
Q

what is the equation for weight

A

mass (kg) x gravitational field strength (m/s/s) or (N/kg)

18
Q

what is the equation for weight

A

mass (kg) x gravitational field strength (m/s/s) or (N/kg)

19
Q

what is Newtons third law of motion

A

every action (force) has an equal and opposite action (force)

20
Q

what is the equation for momentum

A

mass (kg) x velocity (m/s)

21
Q

what is the equation for resultant force

A

change in momentum/ change in time

22
Q

what is the equation for impulse

A

force x time

23
Q

what is a rule on momentum

A

momentum will be the same value before and after a collision

24
Q

what is a vector

A

measurement with direction

25
Q

what is a scale

A

measurement without scale

26
Q

how do you find a total vector when more then one is acting on an object

A

A) same direction: add
B) opposite direction: the difference (minus)
C) different direction: the equations