science forces

Question 1

what is a force

Answer 1

a force is a push or pull on an object due to interactions with another object

Question 2

what is force measured in

Answer 2

Newtons (N)

Question 3

How to convert newtons to kg

Answer 3

1Kg= 9.8N/ ~10N

Question 4

weight equation

Answer 4

Weight = mass x gravity

Question 5

non contact force

Answer 5

a force where the objects and force aren’t physically touching

Question 6

contact force

Answer 6

when the force ando object are physically touching

Question 7

tension

Answer 7

a force that acts in stretched objects like strings, ropes or springs (contact force)

Question 8

weight

Answer 8

a force on an object which is caused by gravity (non contact force)

Question 9

thrust

Answer 9

a push that accelerates an object in a given direction (contact force)

Question 10

upthrust

Answer 10

the upward force acting in liquids and gases (contact force)

Question 11

drag

Answer 11

friction between an object and fluid (gas or liquid) it’s moving through (contact force)

Question 12

electrostatic

Answer 12

a force between objects which are electrically charged like a balloon (non contact force)

Question 12

air resistance

Answer 12

friction between an object and the air it is moving through (contact force)

Question 12

friction

Answer 12

a force caused by 2 surfaces rubbing together (Contact force)

Question 13

magnetic

Answer 13

a force between 2 magnets or between a magnet and an iron or steel object (non contact force)

Question 14

normal force

Answer 14

A force that stops something falling through the floor. It contacts the object at right angle. For example, a book on a table. (contact force)

Question 15

What effects do forces have on objects?

Answer 15

They effect the shape, speed and/or direction

Question 15

independant variable

Answer 15

a variable that is changed on purpose to see how it affects something

Question 16

control variable

Answer 16

multiple things that are kept the same throughout the experiment

Question 16

dependant variable

Answer 16

this is the one that is measured

Question 17

where would you put a weight to make a seesaw balanced

Answer 17

equal weight from the pivot point on the oppoiste side

Question 18

what are the 3 effects of a force

Answer 18

when a resultant force acts, the object may change speed, direction and shape

Question 19

how much is gravity on earth

Answer 19

~10 N/KG

Question 20

how to read a newtown meter correctly

Answer 20

twist the bolt on the top to 0, read from eye level

Question 21

What is Hookes law?

Answer 21

Hooke's Law says that the extension of an elastic object (like a spring) is directly proportional to the force applied. e.g ) A 2 N weight will cause a 4 cm extension. (Force doubled, extension doubled)

Question 22

Wha is the name of the point that a seesaw turns around called?

Answer 22

pivot point

Question 23

What is moment in physics

Answer 23

The moment is how easy it is to turn something. The larger the moment the easier it is to turn

Question 24

Give two factors that determine the size of a moment

Answer 24

distance from pivot point and size of force

Question 25

acceleration

Answer 25

speeding up

Question 26

moment equation

Answer 26

moment = force x **perpendicular** distance

Question 27

What is the turning effect of a force also called

Answer 27

the moment

Question 28

balanced

Answer 28

when two forces are opposite and equal - resultant force = 0N

Question 29

resultant

Answer 29

the sum of all the forces acting on an object

Question 30

work done

Answer 30

energy transfered when a force moves an object through a distance

Question 31

whats a elastic object

Answer 31

an object that can go back to its origional shape

Question 32

True or false? Objects that can regain their original shapes have energy in their gravitational potential energy stores when their shape is changed by a force.

Answer 32

false

Question 33

work done equation

Answer 33

work done = force × distance moved in the direction of the force

Question 34

hookes law equation

Answer 34

F= **K** (spring constant) *multiplied by* **x** (extenstion)

Question 35

what is mass measured in

Answer 35

grams/kg

Question 36

What is mass

Answer 36

the quantity of matter something is made up of

Question 37

things to remember in a method (all)

Answer 37

- dont write about getting the equipment - always start a new line - each step only has one point - imperative (bosy) verbs like pour, use, add, shake, then etc... - always try give precise units - add extra info in brakets

Question 38

directly proportional

Answer 38

when something increases or decreases together

Question 39

when to use bar charts

Answer 39

catergorical data (words)

Question 40

What is friction and air resistance sometimes jointly described as

Answer 40

resistive forces or frictional forces

Question 41

frictional force

Answer 41

a force that stops an object moving

Question 42

resistive force

Answer 42

a force which slows an object down due to its e.g friction, air resistance, drag etc...

Question 43

What instrument is used to measure force

Answer 43

newton meter (force meter)

Question 44

if an object is still, whats the least amount of forces acting on it

Answer 44

2 resultant forces

Question 45

if a spring is stretched does the elastic potential energy increase or decrease?

Answer 45

increase

Question 46

lubricant

Answer 46

a liquid like oil which makes substances smoother/ easier to move against another

Question 47

making more streamlined meaning

Answer 47

changing the shape of something to reduce the frictional force of something