test on wed 12/16

Question 1

what does gravity depend on?

Answer 1

mass of an object

Question 2

how does distance affect gravity?

Answer 2

further away ➡️ weaker gravity

closer ➡️ stronger gravity

Question 3

what is free fall?

Answer 3

an object falling under only the influence of gravity

Question 4

why can we not free fall on earth?

Answer 4

air resistance

Question 5

what 2 items affect air resistance?

Answer 5

shape and size

Question 6

what is terminal velocity?

Answer 6

top speed reached by a falling object. air resistance is equal to gravitational pull net force is equal to zero.

Question 7

draw a picture for the cause of friction

Answer 7

something with a box around 100 n and lines with a circle with some ratchet ass lines and the top one is dark and the bottom half is white as nialls dick

Question 8

write a full complete sentence for the cause of friction - must include where the push is coming from

Answer 8

friction is caused when the “hills and valleys” catch and snag on each other when two surfaces are pressed together closely -hills and valleys pull on each other

Question 9

what is fluid friction?

Answer 9

force that tried to stop an object moving through a fluid (like water) or air

Question 10

what are the 3 ways we can increase friction?

Answer 10

increase mass.
increase push or force.
make surface rougher.

Question 11

write out newton’s 1st law of motion

Answer 11

an object at rest stays at rest, an object in motion stays in motion of constant speed, unless acted upon by an unbalanced force

Question 12

write out newton’s 2nd law of motion

Answer 12

acceleration of an object depends on the mass of the object and the amount of force applied

Question 13

write out newton’s 3rd law of motion

Answer 13

every force has an equal and opposite reaction force

Question 14

define exert

Answer 14

to put fourth, as strength, or make a great effort at something

Question 15

define vector

Answer 15

quantity that has both size & direction

Question 16

define magnitude

Answer 16

general word used when asking about how powerful something is, its size

Question 17

define force

Answer 17

a push or pull

Question 18

define newton

Answer 18

SI base unit for force

Question 19

define net force

Answer 19

overall force acting on an object when all of the forces are combined

Question 20

inertia

Answer 20

how hard it is to change the speed or direction of an object’s motion

Question 21

define gravity

Answer 21

force of attraction between objects that is due to their masses

Question 22

define orbit

Answer 22

path an object takes in space as it moves around another object due to gravity

Question 23

define centripetal force

Answer 23

any force that keeps an object moving in a circle

Question 24

define weight

Answer 24

force of gravity on an object

Question 25

define oppose

Answer 25

to attempt to stop; to resist

Question 26

define friction

Answer 26

force that opposes motion between two surfaces that are touching

Question 27

define fluid

Answer 27

substance that can flow easily, such as a gas or a liquid

Question 28

define fluid friction

Answer 28

force that opposes motion through a fluid

Question 29

lubricant

Answer 29

substance that will reduce friction

Question 30

define elastic force

Answer 30

force in an object that resists stretching or pressing

Question 31

define tension

Answer 31

force that stretches an object, also refers to the force transmitted through a stretched object

Question 32

compression

Answer 32

process of pushing the particles of a material closer together

Question 33

what is gravity?

Answer 33

force of attraction between objects that is due to their masses