Science Class Review?? (everything we've learned)

movement related

1

What is friction?

A contact force that resists motion between 2 objects

2

What is force?

A push/pull upon an object

3

What is a reference point used for?

You use it to describe your position in a place relative to another object/person

4

If a ball is rolling down a hill, what energy does it have the most of?

kinetic energy

5

define inertia.

The tendency of objects to resist any change in motion. 

scientific formulas

1

What is the formula for Newton's second law of motion?

(Newton's second law states that the acceleration of an object is directly related to the net force and inversely related to its mass.)

f=ma

(force=mass x acceleration)

2

How do you calculate kinetic energy?

KE=1/2mv²

3

Formula for density.

d=m/v

4

what is a newton? (DON'T SAY IT'S A WAY OF MEASURING FORCE )

It's the force needed to accelerate a 1 kilogram object by 1 meter a second

5

how do you calculate work?

work = force x distance

energy related

1

Can energy be destroyed?

no

2

what is kinetic energy?

the energy of motion.

3

If an object is high up off the ground what energy does it have? 

potential gravitational energy

4

What part of an object has the most impact on kinetic energy?

(speed, mass, etc)

speed

5

What is Newtons 3rd law?

When one object exerts a force on another, the 2nd object exerts and equal and opposite force.

waves

1

are dominoes a form of wave?

yes

2

What are the highest and lowest points of a wave called? 

crest (high) and trough (low)

3

what are the most compressed and stretched out parts of a spring called?

compression and rarefaction

4

difference between wave and pulse?

pulse is one disruption while a wave is more

5

What is the difference between a transverse and longitudinal wave?

Transverse waves move perpendicular to the direction of the wave & longitudinal waves move in the same direction as the disturbance (forward and backward)

Misc.

1

Is plasma a fourth state of matter?

Yes

2

why do you weigh different weights on different planets?

they have different gravitational pulls

3

difference between molecule & compound?

(hint, all molecules arent compounds & all compounds are molecule)

compounds are made of different atoms

4

C₁₂H₂₂O₁₁    what do he numbers indicate on the chemical formula?

(as in, there is x amount of T or whatever)

(C=carbon, H=hydrogen, o=oxygen, this makes sugar)

there is 12 of c, 22 of h, and 11 of o

5

who said, i think, therefor i am.

René Descartes