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