Intro, Motion & Energy

Question 1

The tendency of a moving object to remain in unchanging motion in the absence of an unbalanced force is called 
_______

Answer 1

inertia

Question 2

The newton is a unit of ______

Answer 2

force

Question 3

Gravity is an attractive force between ___ _______ __________

Answer 3

all objects everywhere

Question 4

Everything that happens in the universe can be traced to interactions of ____ ___________ ______

Answer 4

four fundamental forces

Question 5

What are the four fundamental forces?

Answer 5

gravitational
electromagnetic
weak
strong

Question 6

If a block of iron is transported to the moon, what changes: mass, weight, both, or neither

Answer 6

weight

Question 7

Neglecting air resistance, a ball in freefall will have ________ ____________ & __________ _____

Answer 7

constant acceleration & increasing speed

Question 8

50 kg is about how many newtons?

Answer 8

500

Question 9

Neglecting air resistance, if a ball falls for 2 seconds, how far did the ball fall?

Answer 9

19.6 meters

Question 10

Suppose that a rock is swinging in a circle when some string is let out so that the length doubled as the same speed is maintained. The force now exerted on the string is 
_____ as great as before

Answer 10

half

Question 11

After being released, a ball dropped straight down from a bridge would have an acceleration of

Answer 11

9.8m/s^2

Question 12

A gun is aimed perfectly at an apple hanging from a tree. The instant the gun is fired the apple falls to the ground. Will the bullet hit the apple? Explain reasoning

Answer 12

Yes, it will because all objects fall at the same rate meaning the bullet and the apple are both falling at the same time

Question 13

For an object moving across an icy surface, if you double the mass of an object while the (unbalanced) force remains constant, 
what happens?

Answer 13

The object will move at half the speed

Question 14

True or false: Certain professional football players can throw a football so fast that it moves horizontally in a flat trajectory.

Answer 14

False because no matter how hard the ball is thrown, it will still fall at 9.8m/s^2

Question 15

True or false: When you roll a ball across the floor, it eventually comes to a stop because you are no longer exerting a force on it.

Answer 15

False: No force is required to keep an object in motion. The ball comes to a stop because it is being acted upon by other forces such as friction

Question 16

True or false: An object accelerates when it slows or its direction of movement changes.

Answer 16

True

Question 17

True or false: Newton’s second law states that if an unbalanced force acts on an object, it will move at constant velocity.

Answer 17

False

Question 18

True or false: The reason a moving object slows down is that its force of motion gradually runs out.

Answer 18

False: No force is required to keep an object in motion. The ball comes to a stop because it is being acted upon by other forces such as friction

Question 19

True or false: The momentum of an object remains the same unless an unbalanced force acts on it.

Answer 19

true

Question 20

How many centimeters are in one meter?

Answer 20

100

Question 21

How many millimeters are in one meter?

Answer 21

1,000

Question 22

How many decimeters are in one meter?

Answer 22

10

Question 23

True or false: The density of a 100 g piece of iron is twice as great as the density of a 50 g piece of iron.

Answer 23

False: If the volume of both pieces is equal, then yes, this would be true, but since no volume measurements have been given, then it is impossible to say which has greater density.

Question 24

True or false: The property of mass is a measure of how heavy an object is

Answer 24

False: Weight is a measure of how heavy an object is. It takes gravity into account.

Question 25

True or False: The symbol "∆" is used to refer to an object's density.

Answer 25

False: This symbol represents change. The symbol for density is the Greek letter rho (which looks like a lowercase p).

Question 26

What is a referent?

Answer 26

A referent is a familiar object one can use to describe the property of an object

Question 27

What is the proportional relationship between the number of cookies in the cookie jar and the time you have been eating the cookies?

Answer 27

inverse

Question 28

A 1-cm3 piece is removed from a very large lump of modeling clay with a volume of over 100,000 cm3. Which piece has the greatest density?

Answer 28

The density is the same. The small piece has a smaller volume, but it also has a smaller mass.

Question 29

When a ice cube with a certain weight melts, will the resulting weight of water be greater, less, or equal?

Answer 29

equal

Question 30

When a ice cube with a certain weight melts, will the resulting volume of water be greater, less, or equal?

Answer 30

less

Question 31

Is ice more or less dense than water?

Answer 31

less

Question 32

The property of volume is a measure of what?

Answer 32

how much space the object occupies

Question 33

A statement describing a relationship that is observed in nature to occur consistently time after time is called what?

Answer 33

scientific law

Question 34

Quantities, or measured properties, that are capable of changing values are called what?

Answer 34

variables

Question 35

What is the metric standard unit for mass?

Answer 35

kilogram

Question 36

If the volume of an object increases, but the mass remains the same... will the density increase, decrease, or remain the same?

Answer 36

decrease

Question 37

What is the density of iron if 5.0cm3 has a mass of 39.5g?

Answer 37

7.9

Question 38

If ice has a density of 0.92 g/cm3, what is the volume of 5,000g of ice?

Answer 38

5,400 cm3

Question 39

The energy an object has because of its position is called what?

Answer 39

potential energy

Question 40

True or false: Energy is conserved when a moving object slows to a stop.

Answer 40

True. Even though the total amount of energy in the universe remains constant, energy form does change, so this does conserve usable energy.

Question 41

A spring-loaded paper clamp exerts a force of 2 N on 10 sheets of paper it is holding together. Is the clamp doing work as it holds the papers together?

Answer 41

No because there is no motion involved

Question 42

Kinetic energy is described as:

Answer 42

the energy of motion

Question 43

The formula for finding potential energy is PE=mgh. What do each of these variables mean?

Answer 43

``` M = mass G = acceleration of gravity (or 9.8m/s^2) H = height from the ground ```

Question 44

A car is moving straight down a highway under ideal conditions. What factor has the greatest influence on how much work must be done on the car to bring it to a complete stop?

Answer 44

how fast the car is moving

Question 45

The solar technology that is today contributing about as much energy as moving water is 
_______.

Answer 45

biomass

Question 46

Which form of energy does not require matter for traveling through space? 


Answer 46

radiant

Question 47

What is the basic problem today with using solar cells as a major source of electricity?

Answer 47

manufacturing cost

Question 48

What is pseudoscience?

Answer 48

misleading and often absurd claims of scientific results

Question 49

What two men are known as the beginners of modern science?

Answer 49

Galileo & Newton

Question 50

What is a concept?

Answer 50

a generalized mental image of something

Question 51

What are the five types of energy?

Answer 51

Mechanical, Radiant, Nuclear, Chemical, Electrical

Question 52

What is the difference between speed and velocity?

Answer 52

Velocity describes speed and direction

Question 53

What does this equation mean?: D=1/2AT^2

Answer 53

This is the equation for falling objects or vertical motion: Distance (D) = 1/2 acceleration (A) multiplied by Time (T) squared