Topic 1

Question 1

reference frame

Answer 1

place/object used for comparison to determine motion

Question 2

relative motion

Answer 2

motion of obj determined by reference point

Question 3

force

Answer 3

push or pull in certain direction; determined by strength and direction

Question 4

contact force

Answer 4

objs must touch for force to transfer

Question 5

noncontact force

Answer 5

objs do not have to touch for force to transfer

Question 6

speed

Answer 6

distance obj moves per unit of time

Question 7

instantaneous speed

Answer 7

speed of obj at particular instant in time

Question 8

average speed

Answer 8

total dis/total time

Question 9

velocity

Answer 9

speed with direction

Question 10

acceleration

Answer 10

rate at which velocity changes (speed/direction)

Question 11

inertia

Answer 11

tendency of obj to resist change in current state of motion

Question 12

reaction

Answer 12

force exerted by obj in response to action; equal force, opposite direction

Question 13

balanced forces

Answer 13

2+ forces on one obj, equal strength, opposite direction, net force = 0

Question 14

net force

Answer 14

combination of all forces acting on certain obj
opp. direction, diff.
same direction, sum

Question 15

friction

Answer 15

a force 2 surface expert on each other when rubbed; depends on surface type & mass

Question 16

types of friction

Answer 16

fluid: solid through fluid
rolling: obj rolls across surface
sliding: obj slides across surface
static: force when obj at rest on surface

Question 17

gravity

Answer 17

force that pulls obj together as result of masses

Question 18

mass

Answer 18

amount of matter in obj

Question 19

weight

Answer 19

force of gravity on obj

Question 20

rate

Answer 20

amount of something that occurs/changes in 1 unit of time

Question 21

Newton #1 law

Answer 21

law of inertia: obj stays in constant velocity/current state of motion unless acted upon by an outside force
more mass, more inertia

Question 22

Newton #2 law

Answer 22

F=ma
obj w/ more mass requires more force to accelerate

Question 23

Newton #3 law

Answer 23

Equal and opposite: every action has reaction of equal force, opp. direction, diff. objs

Question 24

Law of Universal Gravitation

Answer 24

gravity acts on any 2+ obj with mass; they are pulled together/attract
more mass, greater pull; more distance, weaker pull

Question 25

motion

Answer 25

obj in motion if positions changes relative to reference frams

Question 26

scalar quantity

Answer 26

only magnitude

Question 27

vector quantity

Answer 27

magnitude & direction