Forces and Motion Unit Test Flashcards Preview

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Flashcards in Forces and Motion Unit Test Deck (30):
1

What is a reference point?

a direction relative to an object in motion

2

what are the two factors that determine an object's speed?

distance and time (distance/time)

3

what is velocity?

speed in a particular direction

4

how is acceleration calculated?

difference in velocity/difference in time

5

how do you combine forces in opposite same directions?

opposite- subtract smaller from the larger
same- add them together

6

what can an unbalanced force do to an object's motion?

make it start moving or change the object's motion

7

what is friction

a common force that opposes motion between two moving objects

8

how can you determine if the forces on an object are balanced or unbalanced?

balanced forces have a net force of 0 newtons, unbalanced forces don't

9

define mass

a measure of the amount of matter in an object

10

define weight

measure of the amount of gravitational force on an object

11

how are mass and weight calculated?

mass is calculated using a balance and weight is calculated using a spring scale

12

why do all objects fall at the same rate?

acceleration due to gravity is the same for all objects

13

what is the rate for acceleration due to gravity

9.8 m/s (2)

14

what factors determine how much gravitational force there is between objects

distance and mass

15

what is projectile motion

the curved path an object follows when thrown or launched

16

what forces act on falling objects

gravity and air resistance

17

what is newtons first law

an object at rest/motion tends to stay in rest/motion unless acted upon by an unbalanced force

18

define inertia

the tendency of all objects to resist any changes in motion

19

what is newtons second law

force=mass x acceleration

20

what is newtons third law

when one object exerts a force on a second object, the second exerts an equal and opposite force on the first

21

what is momentum

mass x velocity

22

what does the law of conservation of momentum state

during a collision, the amount of momentum always remains the same

23

what is a fluid,

a nonsolid state of matter in which the molecules are free to move past each other

24

what is atmospheric pressure

the pressure caused by the weight of the atmosphere

25

what is water pressure

the pressure caused when under water at a certain depth

26

how do fluids move?

the molecules move freely past each other

27

define archimedes principle

the buoyant force on an object in a fluid is an upward force equal to the weight of the volume of the fluid that the object displaces

28

define bernoullis principle

pressure in a fluid decreases as the fuids velocity increases

29

what is lift

upward force on an object that moves in a fluid

30

define pascals principle

a fluid in equilibrium contained in a vessel exerts a pressure of equal intensity in all directions