# science 7 2nd semester exam part 1

## 107 terms

### distance

Speed is the rate of change in ________

### speed & direction

To describe velocity you need to know _____________.

### time, distance

When you graph the motion of an object, you put __________ on the horizontal axis and _________ on the vertical axis.

### direction & speed

Acceleration involves a change in ____________.

### velocity

Acceleration is a change in ___________

### zero

On a speed time graph, a horizontal line shows the change in speed is ____________.

### resists a change in motion of an object

Inertia____________________.

### momentum

If you exert a force on an object in motion you will change its____________.

### speed

The distance traveled divided by the time taken to travel the distance is _________.

### in opposite direction

When object A collides with object B and bounces back, its final momentum is ______ its initial momentum.

### truck plus the car

When a toy truck collides into a toy car, the momentum of _______ is the same before and after the collision.

### how hard it is to stop an object

Momentum is measure of ________________.

### balanced forces

Forces that are equal in size but opposite in direction are ____________.

### travel horizontally

If gravity did not affect the path of a horizontally thrown ball, the ball would _______________

### net

Newton's first law of motion states that an object at rest unless a __________ force acts on it.

### increases

Air resistance ___as you move faster.

### static friction

The force you have to overcome to start an object moving is _____________.

### friction

Whenever a body is in motion, there is always ________ to oppose the motion.

### air resistance

The upward force on an object falling through the air is ____________________.

### Newton's 2nd law

The relationship among force, mass, and acceleration is stated in ________________.

### air resistance

A feather falls throught the air more slowly than a brick because of ________________.

### a = Fnet/m

According to Newton's second law of motion, _________.

### 200 kg

A 3,000 N force gives an object an acceleration of 15 m/s. The mass of the object is _______.

### 12 m/s squared

A 300 N force acts on a 25 kg object. the acceleration of the object is _________.

### Newton's 3rd law

The statement "for every action, there is an equal but opposite reaction" is a statement of ___________.

### forces created same time

With action-reaction forces, the ___________

### the sum of the kinetic and potential energy of the molecules of a substance

...thermal energy

insulator...

celsius scale...

temperature...

conduction...

### a body of water warms from adding water

thermal pollution...

specific heat...

### an engine that burns fuel in a chamber inside the engine

internal combustion engine...

convection...

...heat engine

### temperature scale with 180 degrees between the freezing and boiling points of water

fahrenheit scale...

two-stroke...

thermometer...

conductor...

heat...

buring fuel...

they expand...

conduction...

### Which of the following describes the thermal energy of particles in a substance?

total value of all kinetic and potentiol energy...

insulator...

177 C...

heat...

### Which of the following is an example of heat transfer by conduction?

the warmth you feel holding a cup of hot cocoa...

wedge...

watts...

fulcrum...

wrench...

power...

long...

carry...

distance...

### In order for work to be done, an object must_____.

...move in the direction of the force

second...

distance...

input force...

lawn mower...

due east...

nucleus...

ribosomes...

cell wall...

chloroplasts...

mitochondrian...

Golgi Body...

### process materials and move them around inside the cell

endoplasmin reticulum...

cell membrane...

host cell...

active virus...

organism...

cytoplams...

### Phylogeny tells

how an organism has changed over time...

species...

### Linnaeus developed a system of grouping organisms that was accepted by most scientists. He grouped organisms with ____together.

similar structure...

species...

movement...

ribosomes...

antibiotics...

interferons...

### When an organism regulates its internal environment it is

maintaining homeostasis...

tissue...

organ...

### latent viruses do all of these except

destroy the host cell immediately...

cellulose...

cuticle...

### plants with tube like systems of vessels

vascular plants...

gymnosperm...

angiosperm...

dicot...

phloem...

green algae...

### Seedless nonvascular plants include

mosses & liverworts...

rhizoids...

### The first plants The first plants to grow in new environments are

mosses & liverworts...

gymnosperms...

make food...

### Ferns are the most abundant of the ___plants.

seedless vascular...

coal...

stomata...