Chapter 10-forces

Question 1

what two words describe a force

Answer 1

a push or a pull

Question 2

what units are used to measure the strength of a force

Answer 2

newtons

Question 3

is kicking a soccer ball a push or a pull?

Answer 3

push

Question 4

if the net force is 0 will the objects motion change

Answer 4

no because it is balanced

Question 5

how can you find the net force if two forces act in opposite directions

Answer 5

you subtract

Question 6

how does the direction of friction compare to the direction of motion

Answer 6

they pull in opposite directions

Question 7

what are the two properties that determine the strength of the force of friction

Answer 7

how hard the surfaces push together and the type of surfaces involved

Question 8

4 types of friction:

Answer 8

static, rolling, sliding, fluid

Question 9

why don’t you notice the pull gravity between most objects

Answer 9

because there pull is small compared to the earth

Question 10

state Newton’s law of universal gravitation

Answer 10

gravity acts everywhere in the universe

Question 11

two factors affect the gravitational attraction between two objects:

Answer 11

mass and distance

Question 12

is there such thing as zero gravity

Answer 12

no

Question 13

what is the acceleration velocity of an object as it falls to earth

Answer 13

9.8 m/s

Question 14

fluid friction occurs when

Answer 14

you ride your bike through a puddle

Question 15

a push or a pull

Answer 15

a force

Question 16

forces are measured in units called

Answer 16

newtons

Question 17

__________acting on an object result in a net force and cause a change in the object’s motion

Answer 17

multiple forces

Question 18

opposite forces act on an object do not

Answer 18

change the object’s motion

Question 19

when two or more opposite forces cancel each other out

Answer 19

they are balanced

Question 20

if the effects of the forces don’t cancel out and equal 0

Answer 20

they are unbalanced

Question 21

a force can be shown with

Answer 21

a vector

Question 22

what is a vector?

Answer 22

a line with an arrow that begins with a dot.