science final

15 cards·by 10027224

vector quantities

displacement

a runner runs around a circular track at constant speed

acceleration is constantly changing

when unbalanced forces act on an object, will it accelerate?

yes

list the different types of frictions from strongest to weakest (besides fluid)

static,sliding,and rolling

when a fish swims through water, what type of friction is it encountering?

fluid friction

describe the net forces that are acting on an object which is falling at terminal velocity

the net force stays in balance until it equals 0 and the terminal velocity is reached

as an astronaut travels away from earth, does their weight increase or decrease and why?

the weight decreases because the gravity decreases

what is the SI unit of work?

Joule (J)

for a machine, can work output ever equal the work input

no because of friction

in order to increase the efficiency of a machine, what can you do its friction

decrease the friction

what kind of simple machine is an ax an example of?

wedge

what kind of simple machine is steering wheel an examle of?

wheel and axle

what is a compound machine

combo of two or more simple machines that operate together

work is the transfer of what?

energy

this is the energy of motion

kinetic enegry