Science - Chapter 12 - Test 4/25/14 Flashcards Preview

CMS - 6th Grade - PRIOR NOTECARDS > Science - Chapter 12 - Test 4/25/14 > Flashcards

Flashcards in Science - Chapter 12 - Test 4/25/14 Deck (41)
1

To do work on an object, the object must move some ______ as a result of your work.

To do work on an object, the object must move some distance as a result of your work.

2

Work is done on an object when the object moves in the same direction in which the _____ is exerted.

Work is done on an object when the object moves in the same direction in which the force is exerted

3

The amount of work you do depends on what two things?

1. the force you exert

2. the distance the object moves

4

The amount of work done on an object can be determined by using what formula?

work = force x distance

5

Name 3 factors that can be changed by a machine to make work easier.

1. amount of force you exert

2. distance over which you exert the force

3. direction in which you exert

6

When you do work, the force you exert is called ______.

When you do work, the force you exert is called input force.

7

Force is measure in ______.

Force is measure in Newtons.

8

Distance is measured in ______.

Distance is measured in meters.

9

The SI unit of work is the _______.

The SI unit of work is the newton-meter.

10

A newton-meter is also called a ______.

A newton-meter is also called a Joule (J).

11

Machines do not reduce the amount of work that you do, they _____ the way you do work.

Machines do not reduce the amount of work that you do, they change the way you do work.

12

If the object does not move, ______ is done.

If the object does not move, no work is done.

13

You do _____ any time you exert a force on an object that causes the object to move some distance.

You do work any time you exert a force on an object that causes the object to move some distance.

14

When you lift an object, the upward force you exert must be at least _____ to the object's weight.

When you lift an object, the upward force you exert must be at least equal to the object's weight.

15

Rolling or dragging a suitcase on the ground requires _____.

Rolling or dragging a suitcase on the ground requires work.

16

A ______ is the most basic device for making work easier.

A simple machine is the most basic device for making work easier.

17

Name 3 closely related simple machines.

1. inclined plane

2. wedge

3. screw

18

An inclined plane is a flat, _____ surface.

An inclined plane is a flat, sloped surface.

19

A _____ can be though of as an inclined plane wrapped around a cylinder.

A screw can be though of as an inclined plane wrapped around a cylinder.

20

The fixed point that a lever pivots around is called the _____.

The fixed point that a lever pivots around is called the fulcrum.

21

An inclined plane allows you to exert your ______ over a longer distance

An inclined plane allows you to exert your input force over a longer distance

22

A ramp is an example of a simple machine called an ________.

A ramp is an example of a simple machine called an inclined plane.

23

A _____ is a device that is thick at one end and tapers to a thin edge at the other end.

A wedge is a device that is thick at one end and tapers to a thin edge at the other end.

24

A _____ is an example of a wedge.

A zipper is an example of a wedge.

25

________ holds the screw in place.

Friction holds the screw in place.

26

How many classes of levers are there?

three

27

Levers are classified according to the _______.

Levers are classified according to the location of the fulcrum.

28

Lifting a heavy object is much easier with a _____.

Lifting a heavy object is much easier with a ramp.

29

As the threads of the screw turn, they exert an _______ on the wood.

As the threads of the screw turn, they exert an output force on the wood.

30

______-class levers change the direction of the input force.

First-class levers change the direction of the input force.

31

A _________ is the most basic device for making work easier.

A simple machine is the most basic device for making work easier.

32

Name two simple machines that take advantage of turning.

1. pully

2. wheel & axle

33

What are the 3 types of pulley systems?

1. fixed

2. movable

3. block & tackle

34

A simple machine made of two connected objects that rotate about a common axis is called a ________.

A simple machine made of two connected objects that rotate about a common axis is called a wheel & axle.

35

You use a pulley by pulling on one end of the rope, this is the _______ force.

You use a pulley by pulling on one end of the rope, this is the input force.

36

The object in a wheel and axle with the larger radius is the ______.

The object in a wheel and axle with the larger radius is the wheel.

37

What is an example of a wheel and axle?

paddle wheel on a boat

38

Pulley systems are classified by the ______ of the wheels they contain.

Pulley systems are classified by the number and position of the wheels they contain.

39

When you turn the wheel, the _______.

When you turn the wheel, the axle rotates.

40

A _______ pulley is attached directly to the object you are attempting to move.

A movable pulley is attached directly to the object you are attempting to move.

41

The machine exerts the _______ over the output distance.

The machine exerts the input force over the output distance.

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