3rd nine week exam

Question 1

1. definition of motion?

Answer 1

change in position

Question 2

2. average speed

Answer 2

total distance traveled divided by total travel time

Question 3

constant speed

Answer 3

speed remains the same

Question 4

instantaneous speed

Answer 4

speed of an object at a single instant of time

Question 5

3.difference between speed and velocity?

Answer 5

speed is the time rate at which and object is moving along a path, while velocity is the rate and direction an object is moving. speed=scalar velocity=vector

Question 6

5. definition of acceleration

Answer 6

change in velocity divided by the time for the change to occur.

Question 7

7.what is inertia and what does it depend on?

Answer 7

depends only on mass… more mass=more inertia

Question 8

8. Newtons 3 laws?

Answer 8

1st law-an object in motion will stay in motion
2nd law-force=mass*acceleration
3rd law-for every action there is an equal & opposite reaction

Question 9

9.what does air resistance do to a falling object

Answer 9

air resistance slows down an object, depends on surface area and speed

Question 10

what is the acceleration due to gravity

Answer 10

9.8m/s^2

Question 11

11.what is the equation of newtons second law?

Answer 11

F=M(A)

Question 12

12.path of a projectile

Answer 12

always a parabola. every time you throw an object into the air, it will come back in a parabolic form

Question 13

13.what does the force of gravity depend on?

Answer 13

mass and distance

Question 14

14. how does gravity affect weight

Answer 14

the more gravity the more weight

Question 15

15. S.I unit for momentum?

Answer 15

kgm/s

Question 16

16.what is acceleration

Answer 16

a=change in velocity divided by change in time

Question 17

17.freefall?

Answer 17

object falling under only the influence of gravity, feels weightless

Question 18

19. equation for kinetic energy?

Answer 18

1/2mv^2 (J)

Question 19

20. s.i unit for energy

Answer 19

joule

Question 20

21.law of conservation of energy?

Answer 20

energy is never destroyed, it can be converted or transferred, but the total amount never changes

Question 21

22.what are the moon phases?

Answer 21

MVEMJSUN

Question 22

23. what is the difference between rotation and revolution?

Answer 22

rotation is the spinning of the earth on its axis, revolution measures years

Question 23

24.how does the tilt of the earth affect the seasons?

Answer 23

when the earth spins on its axis it has a tilt, depending on what direction it is tilting that causes our seasons