forces test

Question 1

what two things can be happening to an object happen when the resultant force is 0

Answer 1

moving at a constant speed and stationary

Question 2

to start a mass moving do u need to reduce or increase the force as the ramp gets steeper

Answer 2

reduce

Question 3

force that slows down moving objects

Answer 3

friction

Question 4

why are many moving objects designed streamlined

Answer 4

so they will be less affected by air resistance

Question 5

what is a fluid

Answer 5

a a substance with no fixed shape, a gas or a liquid

Question 6

units of pressure

Answer 6

n/m squared

Question 7

why do some objects sink

Answer 7

weight is more than upthrust

Question 8

equation for fluid pressure

Answer 8

force/surface area

Question 9

equation for fluid pressure

Answer 9

force/surface area

Question 10

what happens to pressure in a fluid

Answer 10

the deeper you go the greater the pressure

Question 11

what is the pressure exerted by a man standing on one leg

Answer 11

twice the pressure he exerts standing on 2 legs

Question 12

100 N spread over 0.5m what is the pressure

Answer 12

200 n/m squared

Question 13

snow shoe or drawing pin increases pressure

Answer 13

pin

Question 14

high heel or lying flat reduce pressure

Answer 14

lying flat

Question 15

pressure triangle

Answer 15

force at the top, surface area to the ;ft, pressure to the right

Question 16

calculate force

Answer 16

pressure x area

Question 17

calculate area

Answer 17

force/pressure

Question 18

calculate pressure

Answer 18

force/area

Question 19

when 2 variables are graphed and show a straight line which goes through the origin and they can be directly proportional

Answer 19

linear relationship

Question 20

single force which can replace all the forces acting on an object and has the same effect

Answer 20

resultant force

Question 21

changing shape due to a force

Answer 21

deformation

Question 22

pressure caused by the weight of the air above

Answer 22

atmospheric pressure

Question 23

force opposing motion which is caused by the interaction of surfaces moving over one another

Answer 23

friction

Question 24

force extending or pulling apart

Answer 24

tension

Question 25

forces squashing or pushing together

Answer 25

compression

Question 26

the upward force that a liquid or gas exerts on a body floating in it

Answer 26

upthrust

Question 27

equilibrium

Answer 27

state of an object when opposing forces are balanced

Question 28

contact force

Answer 28

a force that acs by direct contact

Question 29

speed

Answer 29

distance/time