contact forces quiz

what is force?

force is a push or a pull motion that causes shape change, direction change, and motion change. it is measured in newtons.

what does force do to an object?

force causes an object to bend or break or become damaged/deformed.

what is ke? explain the relationship between release height and ke transfer to a block.

ke is the energy of motion. when we used the ramp and increased the release height, we made the cart go faster and have more ke to transfer to the block so the block was pushed farther.

when we lowered the release height, there was less pe that turned into ke that made less ke transfer to the block. the block was pushed less distance.

explain the relationship to mass and ke. use Newtons 2nd law to explain.

the more mass, the more ke- the cart moves fast, and will push but eventually due to fma, the acceleration will slow.

explain how newton’s cradle works- use the terms: thermal energy, potential energy, friction, air resistance, and sound energy.

first ball height increase- gpe increase

gpe → ke → te due to friction of the balls hitting, sound energy lost because of the clicking noise, and air resistance causing friction to slow it down (and te)

what was the purpose of the elastic limit experiment? was it more force or ke related?

the purpose of the elastic limit experiment was to see how much downward force is needed to deform and snap pasta, coffee stirs, and rice noodles. when force is applied to an object- it bends until it snaps or permanently deforms aka reaches the elastic limit of force. this lab was force related.

define surface area

surface area is the amount of material/bumps that add friction to a surface. for example a towel has so many fibers that it has a very high surface area and lots of frictional force. ice has less surface area and therefore lower friction force. this is a direct relationship.

explain frictional surfaces and how they slow motion

frictional surfaces have lots of surface area that grabs the box and slows motion. friction is a contact force.

friction

opposes motion and slows down an object. the more friction, the slower the object goes

air resistance

a type of friction through moving air that opposes motion/ caused by air molecules that prevent objects through moving through the air.

kinetic energy

the energy of motion

potential energy

amount of energy stored before motion, gets transformed into ke

thermal energy

heat created by friction when 2 surfaces rub against each other other

sound energy

sound created from thermal energy

frictional surfaces

the surface that resist motion, related to surface area

elastic limit

the amount of bend an object can take until it breaks

energy transfer

energy going from one object into another

energy transformation

energy transformation is when one type of energy turns into another type

what are some key points about contact force?

what force does to an object

elastic limit lab

make things bend and snap

speed vs mass

how ke transfers

release height

forces happen in equal and opposite pairs

force makes things bend, snaps, deform

lab- changing mass and height of the cart–pushes back

mass has a linear graph relationship