Forces Flashcards

1
Q

what is a vector

A

a quantity that has magnitude and direction

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2
Q

what is a scalar

A

a quantity that only has magnitude

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3
Q

give examples of scalars

A

temperature
mass
energy
speed
density
distance

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4
Q

give examples of vectors

A

force
weight
displacement
velocity
acceleration
momentum

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5
Q

what is a contact force

A

when the objects are touching

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6
Q

what is a non contact force

A

the objects are not touching

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7
Q

give examples of contact forces

A

friction
air resistance
tension
normal contact force
upthrust

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8
Q

give examples of non contact forces

A

gravitational force
electrostatic force
magnetic force

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9
Q

what is gravity

A

the force of attraction between all masses

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10
Q

what is the equation for weight

A

mass x gravitational field strength

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11
Q

what is the resultant force

A

A number of forces acting on an object may be replaced by a single force that has the same effect as all the original forces acting
together

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12
Q

what must be done to change the shape of an object

A

more than one force must be applied

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13
Q

what does elastically deformed mean

A

if the object returns to its original shape after the forces are removed

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14
Q

what does inelastically deformed mean

A

if the object does not return to its original form

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15
Q

what is the equation for force

A

spring constant x extension

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16
Q

elastic potential energy equation

A

0.5 x spring constant x extension squared

17
Q

what is distance

A

how far an object moves (scalar quantity)

18
Q

what is displacement

A

includes the distance the object has moved and the direction

19
Q

what is velocity

A

the speed of an object in a given direction

20
Q

what will the line look like on a distance time graph is the object is accelarating

A

the line will be curved

21
Q

what is the equation for acceleration

A

change in velocity / time taken

22
Q

what is newtons first law

A

the object will remain in the same state of motion unless acted upon by an external force

23
Q

what is inertia

A

the tendency of objects to continue in their state of rest

24
Q

what is newtons second law

A

The acceleration of an object is proportional to the resultant force
acting on the object, and inversely proportional to the mass of the
object

25
what is the equation for force
mass x acceleration
26
what is newtons third law
every action there is an equal opposite reaction
27
what is the stopping distance
the sum of the distance the vehicle travels during the drivers reaction time
28
what does the stopping distance depend on
thinking distance - distance travelled during the drivers reaction time braking distance - distance travelled under the braking force
29
what is the conservation of momentum
In a closed system, the total momentum before an event is equal to the total momentum after the event.