phys 2 easy

Question 1

what happens to waves when they enter a denser material?

Answer 1

slow down and bend

Question 2

what force keeps objects in orbit?

Answer 2

gravitational attraction

Question 3

satellite

Answer 3

something that orbits something else

Question 4

stopping distance

Answer 4

thinknig distance+ breaking distance

Question 5

thinknig distance

Answer 5

time travelled between seeing hazard and hitting brakes

Question 6

breaking distance

Answer 6

distance travelled in time between hitting brakes and stopping

Question 7

fluid

Answer 7

substance with no fixed shape which yield weasily to external pressure. gas or liquid.

Question 8

force increased on current carrying wire

Answer 8

increase current
increase magnetic flux ddensity
increase length of wire in field

Question 9

electromagnet

Answer 9

solenoid with iron core

Question 10

solenoid magnetic field strengthened

Answer 10

increasing current
increasing turns
adding iron core

Question 11

velocity

Answer 11

speed in given direction

Question 12

displacement

Answer 12

distance travelled in given direction

Question 13

acceleration

Answer 13

how velocity of an object is changing

Question 14

magnetic field

Answer 14

area around a magnet where it can act on another magnet or magnetic material

Question 15

permanent magnet

Answer 15

produces own magnetic field. can attract and repel.

Question 16

induced magnet.

Answer 16

becomes magnetic when placed in magnetic field. only attract.

Question 17

centre of mass

Answer 17

point at which object’s mass can be thought of as being concentrated.

Question 18

newtons 3rd law

Answer 18

whenever 2 objects interact, they exert equal and opposite forces on each other

Question 19

newtons 2nd law

Answer 19

force=massxacceleration

Question 20

absolute zero

Answer 20

no kinetic energy=0K=273 degrees celcius

Question 21

moment

Answer 21

turning force around a point

Question 22

increase size of moment

Answer 22

increase size of applied force
increasing distance of applied force from pivot

Question 23

pivot

Answer 23

point about which rotation will take place

Question 24

newtons 1st law

Answer 24

an object remains in the same state of motion unless a resultant force acts on it.

Question 25

concave lens

Answer 25

)(

Question 26

convex lens

Answer 26

()

Question 27

speed of light

Answer 27

300000000m/s

Question 28

specular reflection

Answer 28

smoot surface. organised so image can be formed.

Question 29

diffuse reflection

Answer 29

rough surface. disorganised so image cannot be formed.

Question 30

p waves

Answer 30

longitudinal and faster

Question 31

s waves

Answer 31

transverse and slower

Question 32

speed of sound

Answer 32

330m/s in air

Question 33

sound waves

Answer 33

longitudinal

Question 34

transverse waves

Answer 34

oscillate perpendicular

Question 35

longitudinal waves

Answer 35

osscilate parallel