sci

Question 1

what is work?

Answer 1

using a force to move an object a distance
(in the same direction).

Question 2

You do work only when you exert a _____ on an object and ______ it.

Answer 2

You do work only when you exert a force on an object and move it.

Question 3

What is the formula for work?

Answer 3

W= f x d

Question 4

what are the 2 things you need to find in order to calculate the work of an object in the formula?

Answer 4

the force applied and the distance travelled

Question 5

What are the 2 units that work is measured in?

Answer 5

newtons-meters (n.m)
joules (J)

Question 6

One Newton of Force moving 1 meter is known as a _____ (_)

Answer 6

One Newton of Force moving 1 meter is known as a joule (J)

Question 7

Who is the joule named after?

Answer 7

british physicist James Prescott Joules

Question 8

what are the 2 conditions that have to be met in order for work to be done?

Answer 8

A force must cause an object to move a distance in order to do work.

The object must move in the same direction that the force is being applied.

Question 9

Is work being done if I am holding an object while standing in one place?

Answer 9

No,
No work is done when you stand in place holding an object.

Question 10

You are holding a 5N pan of chocolate brownies, waiting for your friend to open the door. Is there any work being done? Show your work.

Answer 10

W=FxD
work= 5N x 0 m=0

You have not moved the pan or opened the door, so no work was done.

Question 11

Work (does/ does not) depend on the direction of an object.

Answer 11

Work also depends on direction.

Question 12

Does the force have to be in the same direction as the motion in order for work to be done on an object?

Answer 12

Yes,
The force must be in the same direction as the motion, or no work is done on the object.

Question 13

A crane uses an average force of 5200 N to lift a girder 25 m, calculate the work.

Answer 13

W =Fxd
W = 5200N x 25m
W = 130,000 J

Question 14

The brakes on a bicycle apply 125 N of frictional force to the
wheels as it travels 14.0 m

Answer 14

No work because friction acts in opposite direction of motion.
THE FORCE AND MOVEMENT SHOULD BE IN THE SAME DIRECTION.

Question 15

what is energy?

Answer 15

energy is the ability to do work or cause change

Question 16

what is energy measured in?

Answer 16

joule (J)

Question 17

(T/F) Energy and work are both measured in the same unit: the joule (J).

Answer 17

True

Question 18

When a person does work on an object, the person can _______ energy to that object.

Answer 18

When a person does work on an object, the person can transfer energy to that object.

Question 19

When you turn on a radio and sound comes through your headphones

What occurred that caused energy to form?

Answer 19

In this case a change occurred, and energy was formed.

Question 20

what are the 4 main forms of energy?

Answer 20

1. Mechanical energy
2. Electrical energy
3. Chemical energy
4. Radiant energy (energy from the sun that warms the earth)

Question 21

what is radiant energy?

Answer 21

the energy from the sun that warms the earth

Question 22

Energy is the _______ to do work

Answer 22

Energy is the capacity to do work

Question 23

What are the main 2 categories of energy?

Answer 23

Kinetic and Potential

Question 24

(true/false) kinetic energy is the energy of work

Answer 24

false

Question 25

what is kinetic energy?

Answer 25

Energy of motion

Question 26

A car driving on the highway is an example of (kinetic/ potential) energy

Answer 26

kinetic

Question 27

what is potential energy

Answer 27

stored energy (stored ability to do work)

Question 28

an object balanced on the edge of a cliff is an example of ( kinetic/ potential) energy

Answer 28

potential

Question 29

(true/false) the energy in nuclear bonds is an example of kinetic energy

Answer 29

false it is an example of potential energy

Question 30

Can energy can be converted between types?

Answer 30

yes

Question 31

what are the 3 types of potential energy?

Answer 31

Gravitational potential energy Elastic potential energy Chemical potential energy

Question 32

what is gravitational potential energy?

Answer 32

The energy due to gravitational forces between objects.

Question 33

What forms elastic potential energy?

Answer 33

the elastic forces that are between the particles that make up a stretched rubber band

Question 34

What is chemical potential energy?

Answer 34

Chemical energy is a form of potential energy stored in chemical bonds.

Question 35

what forms chemical potential energy?

Answer 35

The stored energy that is caused by the chemical bonds between the atoms. These chemical bonds form chemical potential energy.

Question 36

Chemical ______ form chemical potential energy.

Answer 36

Chemical bonds form chemical potential energy.

Question 37

a child at the top of a slide is an example of what type of potential energy?

Answer 37

gravitational

Question 38

a compressed/stretched spring is an example of what type of potential energy?

Answer 38

elastic

Question 39

the food that you eat is what type of potential energy?

Answer 39

chemical

Question 40

(true/ false) the amount of energy in the universe is constant.

Answer 40

true

Question 41

what does conservation of energy mean?

Answer 41

conservation of Energy means energy is neither created nor destroyed.

Question 42

Do we create energy at a power plant?

Answer 42

No, we simply transform energy at power plants.

Question 43

when friction converts kinetic energy into thermal energy makes things hot, its an example of what?

Answer 43

conservation of energy

Question 43

when a falling object converts gravitational potential energy into kinetic energy is an example of a) work b) elastic potential energy c) conservation of energy d) newtons 2nd law of motion

Answer 43

c) conservation of energy

Question 44

Doing _____ on something changes that object's energy by the amount of work done.

Answer 44

Doing work on something changes that object's energy by the amount of work done.

Question 45

(true/false) energy can be created or lost.

Answer 45

false NO ENERGY IS CREATED OR LOST