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Flashcards in Science - Physics (Mechanics) Deck (39):
1

displacement

distance than an object is from some starting point

2

how is motion described?

displacement, velocity, acceleration

3

equation for speed

speed = distance traveled/time

4

velocity

speed in a given direction (speed and direction)

5

acceleration

the rate of change in velocity

6

deceleration

negative acceleration or decrease in velocity - can cause change in direction

7

acceleration equation

acceleration = final velocity - original velocity / time

8

what can be described using vectors

velocity and acceleration (they both have magnitude and direction)

9

equation for momentum

momentum = mass x velocity

10

what is the main law of classical physics that states that the total momentum of an isolated system is always constant

conservation of momentum

11

what is newton's first law

law of inertia
object in motion stays in motion..rest

12

inertia

property of matter that resists any change in motion

13

what is newtons second law

force = mass x acceleration (f=ma)

14

The newton (N) unit

unit that represents a force that accelerates a mass of 1 kg, 1 m per second

15

force of attraction between all objects in the universe

gravity

16

density equation

density = mass/vol

17

Torque

perpendicular force times the lever arm

18

lever arm

distance from the axis of rotation to the point where the force is exerted

19

the farther the force from the axis of rotation,

the easier it is to rotate the object and the more torque is produced

20

newtons third law

for every action there is, there is an equal and opposite reaction

21

energy

ability to do work

22

kinetic energy

energy associated with motion

23

equation for kinetic energy

kinetic energy = 1/2 (mass x velocity)^2

24

potential energy

energy stored in a body because of position

25

the product of the force applied to an object and the distance through which the force is applied

work

26

equation for work

work = force x distance

27

unit of energy equal to the work done by a force of 1 newton acting over a distance of 1 meter

joule

28

power

rate at which work is done

29

equation for power

power =
force x distance / time = work / time

30

what is the device that makes work easier by changing the force or the direction of an applied force

machine

31

efficiency

work done / energy used to power the machine
or
work input : work output

32

what are the 6 simple machines

inclined plane
wedge
screw
lever
pulley
wheel and axle

33

what is a compound machine

combo of two or more simple machines

34

inclined plane

slanted surface used to raise an object

35

wedge

moving inclined plane

36

screw

inclined plane wrapped around a cylinder

37

lever

free to move around a fulcrum when force is applied

38

pulley

chain or rope wrapped around a wheel

39

wheel and axle

lever than rotates in a circle