Science Review Topic 1 Random.

Question 1

What is an observation?

Answer 1

Noticing or finding details, examples are color, texture. The 5 senses usually help with this :)

Question 2

Which of the following is a Hypothesis;
A) If I water plants daily then they will grow faster.
B) If I water plants daily they will grow faster.
C) The plant will grow

Answer 2

B!

Question 3

What is the variable that is manipulated, or changed?

Answer 3

Independent Variable

Question 4

What is the dependent variable in this situation;

John wanted to see if plants grew when he was away, so he set up a system to water his plants on his 4 day trip. What is the dependent variable?

Answer 4

The amount of inches the plant grew

Question 5

What is a control group; and why is it important to experiments?

Answer 5

A Control group is the group that is not tested, this is important because it shows baseline results.

Question 6

What is DNA?

Answer 6

The genetic code inside of cells.

Question 7

What are cells?

Answer 7

The building block of life, organisms and species. (including us!)

Question 8

What is the combination of energy and chemical reactions in our body?

Answer 8

Metabolism

Question 9

Homeostasis is the process where living things maintain a _______ internal enviorment.

Answer 9

Stable!

Question 10

Taken as a group, living things evolve, linked to a common origin.

Answer 10

Evolution (^o^)

Question 11

Define friction

Answer 11

a force that resists motion

Question 12

Cause of Friction

Answer 12

contact between materials (molecules touch)

Question 13

Symbol of Friction

Answer 13

F to the power of f

Question 14

What is Friction measured in?

Answer 14

newtons (N)

Question 15

Name 3 types of friction

Answer 15

air, liquid, rolling

Question 16

How can you increase friction

Answer 16

change material, change weight, change amount

Question 17

If a bowling ball is moving forward what is the direction of friction

Answer 17

backwards

Question 18

How can you decrease friction

Answer 18

make the surface smother, change material.

Question 19

weight is

Answer 19

a measure of an objects gravity (hint: its measured in newtons)

Question 20

mass is

Answer 20

the amount of matter an object is made of

Question 21

gravity is

Answer 21

an attraction between all matter

Question 22

more mass =

Answer 22

more gravity & matter

Question 23

gravity is a ___ & ______ force

Answer 23

gravity is a weak and fundamental force.

Question 24

gravity weaknesses as distance _____

Answer 24

increases

Question 25

center of gravity is ____

Answer 25

imagined (based on perspective)

Question 26

free fall is when an object accelerates with only

Answer 26

gravity

Question 27

true or false: gravity can cause acceleration

Answer 27

true!

Question 28

define Net Force (FNet)

Answer 28

combination of all forces acting on an object

Question 29

forces in the same direction

Answer 29

add to become stronger

Question 30

forces in the opposite direction are

Answer 30

subtracted to become weaker

Question 31

if one ball is moving with the fnet of 5 and the friction is 2 what is the FNET.

Answer 31

3 would be the fnet

Question 32

velocity is

Answer 32

speed in any direction

Question 33

acceleration is

Answer 33

the rate at which the object is speeding up

Question 34

name a type of acceleration

Answer 34

speed up, slow down, change direction

Question 35

balanced forces

Answer 35

forces that cancel out

Question 36

unbalanced forces

Answer 36

forces that don’t cancel out

Question 37

balanced forces are _ FNet

Answer 37

0

Question 38

unbalanced forces have a _____ FNet

Answer 38

positive

Question 39

Normal forces are

Answer 39

forces that exert when something presses against it.