Force, Newton's Laws and Energy Test

Question 1

A push or pull

Answer 1

force

Question 2

The combination of all forces acting on an object

Answer 2

net force

Question 3

The units for force

Answer 3

Newtons (N)

Question 4

The units for energy

Answer 4

Joules (J)

Question 5

What type of forces lead to acceleration?

Answer 5

unbalanced

Question 6

Can an object move if forces are balanced?

Answer 6

YES! If forces are balanced an object it moves at a constant velocity. If you are pedaling your bike at a constant velocity, you are still exerting force but friction is matching you.

Question 7

What is the general rule for the direction of friction?

Answer 7

Opposite the direction an object is moving

Question 8

The force that opposes motion

Answer 8

friction

Question 9

What force exists when an object is being pushed or pulled but not moving?

Answer 9

static friction

Question 10

This friction occurs when a solid moves through a liquid or a gas

Answer 10

fluid friciton

Question 11

Air resistance is an example of

Answer 11

fluid frction

Question 12

Skateboards or wheels experiences

Answer 12

rolling friciton

Question 13

What force pulls objects towards each other?

Answer 13

gravity

Question 14

What two properties affect the strength of gravity?

Answer 14

Distance between the objects and Mass

Question 15

Objects that are close together

Answer 15

exert a strong gravitational pull

Question 16

Objects that are massive

Answer 16

exert a strong gravitational pull

Question 17

Inertia

Answer 17

A resistance to a change in motion (related to 1st law) Objects with lots of inertia resist a change in motion. Objects with lots of mass have lots of inertia.

Question 18

1st law

Answer 18

Objects in motion stat in motion unless acted upon by an outside force.

Question 19

2nd law

Answer 19

Mass, force and acceleration are related: F = MxA

It takes a large force to accelerate a large mass or cause a large acceleration

Question 20

3rd law

Answer 20

Every action has an equal an opposite reaction.

Question 21

WHICH LAW? A soccer ball sits in a field?

Answer 21

1st… it stays at rest

Question 22

WHICH LAW? A soccer ball rolls to a stop.

Answer 22

1st… it stays in motion until friction acts on it

Question 23

WHICH LAW? When kicked a canon ball accelerates less than a soccer ball

Answer 23

2nd. .. the large mass of the cannon ball is hard to accelerate
1st. .. the motion of the canon ball is hard to change because of its large inertia.

Question 24

WHICH LAW? SUVs use more gasoline to accelerate at 10 mi/hr/s than do motorcycles

Answer 24

2nd… the large mass of an SUV require more force (gas) to accelerate at the same rate as a less massive vehicle

Question 25

WHICH LAW? A swimmer pushes water backwards with her feet to move forwards

Answer 25

3rd... the water pushes on the swimmer just as hard as she pushes on the water

Question 26

WHICH LAW? The Sun and the Earth exert the same gravitational force upon each other.

Answer 26

3rd... All force pairs are equal and opposite. However, the Earth accelerates more from the same sized force because it has far less mass.

Question 27

WHICH LAW? The harder you hit a volleyball, the more it hurts

Answer 27

3rd... The volley ball exerts more force on your hand as you put more force into it.

Question 28

Kinetic energy

Answer 28

The energy of motion

Question 29

KE depends on

Answer 29

Mass and velocity

Question 30

Potential Energy

Answer 30

Stored energy

Question 31

Gravitational Potential Energy

Answer 31

Energy stored in objects with mass and height and also experiencing gravity.

Question 32

Elastic Potential Energy

Answer 32

Energy stored in something that is stretched or compressed

Question 33

Electromagnetic Energy

Answer 33

Energy associated with fields of force around charged particles

Question 34

Thermal Energy

Answer 34

Energy related to vibrating atoms or molecules... vast vibrations is high energy

Question 35

Chemical Potential Energy

Answer 35

Energy stored in the bonds between atoms. When these bonds are broken it makes the atoms shake, increasing thermal energy

Question 36

WHAT TYPE OF ENERGY? Light

Answer 36

Electromagnetic

Question 37

WHAT TYPE OF ENERGY? Radio Waves

Answer 37

Electromagnetic

Question 38

WHAT TYPE OF ENERGY? X rays

Answer 38

Electromagnetic

Question 39

WHAT TYPE OF ENERGY? A car moves across flat ground

Answer 39

KE

Question 40

WHAT TYPE OF ENERGY? A hammer waits to fall

Answer 40

GPE

Question 41

WHAT TYPE OF ENERGY? The atoms in an iron pan vibrate and cook meat

Answer 41

Thermal

Question 42

WHAT TYPE OF ENERGY? A log waits to burn in a fireplace

Answer 42

Chemical Potential

Question 43

WHAT TYPE OF ENERGY? A candy bar

Answer 43

Chemical Potential

Question 44

WHAT TYPE OF ENERGY? A bungie cord is stretched and waiting to pull a person back up.

Answer 44

EPE

Question 45

WHAT TYPE OF ENERGY? A Slinky waits at the top of the stairs

Answer 45

GPE

Question 46

WHAT TYPE OF ENERGY? A slinky is stretched across the floor of a science classroom.

Answer 46

EPE

Question 47

WHAT TYPE OF ENERGY? someone runs

Answer 47

KE

Question 48

Energy cannot be...

Answer 48

created nor destroyed... only changed from one form to another.

Question 49

Energy appeared to be lost in the marble roller coaster because...

Answer 49

we did not keep track of heat energy. Friction turned KE into thermal energy.

Question 50

When was KE high on the marble roller coaster?

Answer 50

when the hight was low... this allowed for GPE to be converted into large velocities or large KE.

Question 51

When was KE low on the marble roller coaster?

Answer 51

KE was low when the height was high? This meant that most of the energy was stored as GPE. The marble converted its KE to travel up the second hill on the roller coaster.