forces and motion

Question 1

scalar

Answer 1

can be physically measured

just has a magnitude

Question 2

vector

Answer 2

has a magnitude and a given direction

Question 3

scalar examples

Answer 3

temperature 
mass
energy
distance
speed
density

Question 4

vectors

Answer 4

force
velocity 
displacement
acceleration
momentum

Question 5

vectors represented by

Answer 5

arrows with according size and direction

Question 6

object interaction

Answer 6

A force is a push or pull that acts on an object due the interaction with another object all force

Question 7

contact force

Answer 7

Forces acting between 2 objects which are physically touching.

Question 8

Non contact force

Answer 8

forces acting between 2 objects which are not physically touching

Question 9

friction

Answer 9

2 surface is rubbing against each other and causing friction

Question 10

Examples of contact force

Answer 10

Friction
air resistance
tension
reaction force

Question 11

Examples of non contact force

Answer 11

Magnetic force

electrostatic force gravitational force

Question 12

gravity

Answer 12

All matter have gravitational field strength

gravity attract all matter

Question 13

weight

Answer 13

Force acting on object due to gravity
depends on strength of gravitational field strength
measured in Newton

Question 14

mass

Answer 14

Amount of something
same value everywhere
not a force
measured in kilograms

Question 15

weight equation

Answer 15

weight (N) = mass(KG) x grav(N/KG)

Question 16

Resultant force

Answer 16

Multiple forces acting on an object can be added or subtracted until equivalent of one force

Question 17

Free body diagram

Answer 17

Describe several forces acting on an object using arrows as forces

Question 18

Work done

Answer 18

when a force moves an object through a distance energy is released and work is done

Question 19

Frictional forces

Answer 19

Work done against frictional forces causes a rising temperature

Question 20

work done equation

Answer 20

work done (J)= force(N) x distance(m)

Question 21

springs

Answer 21

To stretch bend or compress an object by applying force more than one force is required this will cause a change in shape

Question 22

Work done on Springs

Answer 22

work is done when a force structures or compresses an object this causes energy to be transferred to the elastic potential energy store

Question 23

Elastic deformation

Answer 23

when an object can return to original shape after force is removed EG elastic band

Question 24

Inelastic/plastic deformation

Answer 24

when an object does not return to original shape once force is removed when a spring has been pulled too far

Question 25

Hooks law

Answer 25

Day extension of an elastic object is directly proportional to the force applied as long as the limit of proportionality is not exceeded

Question 26

hookes law equation

Answer 26

force (N)= spring constant (N/m) x extention(m)

Question 27

Limits of proportionality

Answer 27

Non linear line
does not follow hooke’s law
plastic behavior
lots of extension not enough force

Question 28

work done and energy stored equation

Answer 28

work done(J) = 1/2spring constant(N/m) x extension(m)

Question 29

Moment and rotation

Answer 29

object on pivot point which rotates but does not move away 
perpendicular distance (90)
force causes turning effect

Question 30

momentum equation

Answer 30

momentun (Nm) = force(N) distance(m)

Question 31

levers

Answer 31

levers increase the distance from the pivot where force is applied this means
less force is needed to get same moment
makes easier to do work

Question 32

gears

Answer 32

Circular discs with teeth teeth interlocked
which means turn one other turns in opposite direction
used to transmit the rotational effect of a force
different size gears change moment
force is transmitted to large gear causing bigger moment as distance to pivot is greater
large gear turn slower than short gear