Force, Newton's Laws and Energy Test Flashcards Preview

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Flashcards in Force, Newton's Laws and Energy Test Deck (51):
1

A push or pull

force

2

The combination of all forces acting on an object

net force

3

The units for force

Newtons (N)

4

The units for energy

Joules (J)

5

What type of forces lead to acceleration?

unbalanced

6

Can an object move if forces are balanced?

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.

7

What is the general rule for the direction of friction?

Opposite the direction an object is moving

8

The force that opposes motion

friction

9

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

static friction

10

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

fluid friciton

11

Air resistance is an example of

fluid frction

12

Skateboards or wheels experiences

rolling friciton

13

What force pulls objects towards each other?

gravity

14

What two properties affect the strength of gravity?

Distance between the objects and Mass

15

Objects that are close together

exert a strong gravitational pull

16

Objects that are massive

exert a strong gravitational pull

17

Inertia

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.

18

1st law

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

19

2nd law

Mass, force and acceleration are related: F = MxA
It takes a large force to accelerate a large mass or cause a large acceleration

20

3rd law

Every action has an equal an opposite reaction.

21

WHICH LAW? A soccer ball sits in a field?

1st... it stays at rest

22

WHICH LAW? A soccer ball rolls to a stop.

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

23

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

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.

24

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

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

25

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

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

26

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

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

27

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

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

28

Kinetic energy

The energy of motion

29

KE depends on

Mass and velocity

30

Potential Energy

Stored energy

31

Gravitational Potential Energy

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

32

Elastic Potential Energy

Energy stored in something that is stretched or compressed

33

Electromagnetic Energy

Energy associated with fields of force around charged particles

34

Thermal Energy

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

35

Chemical Potential Energy

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

36

WHAT TYPE OF ENERGY? Light

Electromagnetic

37

WHAT TYPE OF ENERGY? Radio Waves

Electromagnetic

38

WHAT TYPE OF ENERGY? X rays

Electromagnetic

39

WHAT TYPE OF ENERGY? A car moves across flat ground

KE

40

WHAT TYPE OF ENERGY? A hammer waits to fall

GPE

41

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

Thermal

42

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

Chemical Potential

43

WHAT TYPE OF ENERGY? A candy bar

Chemical Potential

44

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

EPE

45

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

GPE

46

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

EPE

47

WHAT TYPE OF ENERGY? someone runs

KE

48

Energy cannot be...

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

49

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

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

50

When was KE high on the marble roller coaster?

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

51

When was KE low on the marble roller coaster?

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.