Science - Physics (Mechanics)

Question 1

displacement

Answer 1

distance than an object is from some starting point

Question 2

how is motion described?

Answer 2

displacement, velocity, acceleration

Question 3

equation for speed

Answer 3

speed = distance traveled/time

Question 4

velocity

Answer 4

speed in a given direction (speed and direction)

Question 5

acceleration

Answer 5

the rate of change in velocity

Question 6

deceleration

Answer 6

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

Question 7

acceleration equation

Answer 7

acceleration = final velocity - original velocity / time

Question 8

what can be described using vectors

Answer 8

velocity and acceleration (they both have magnitude and direction)

Question 9

equation for momentum

Answer 9

momentum = mass x velocity

Question 10

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

Answer 10

conservation of momentum

Question 11

what is newton’s first law

Answer 11

law of inertia

object in motion stays in motion..rest

Question 12

inertia

Answer 12

property of matter that resists any change in motion

Question 13

what is newtons second law

Answer 13

force = mass x acceleration (f=ma)

Question 14

The newton (N) unit

Answer 14

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

Question 15

force of attraction between all objects in the universe

Answer 15

gravity

Question 16

density equation

Answer 16

density = mass/vol

Question 17

Torque

Answer 17

perpendicular force times the lever arm

Question 18

lever arm

Answer 18

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

Question 19

the farther the force from the axis of rotation,

Answer 19

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

Question 20

newtons third law

Answer 20

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

Question 21

energy

Answer 21

ability to do work

Question 22

kinetic energy

Answer 22

energy associated with motion

Question 23

equation for kinetic energy

Answer 23

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

Question 24

potential energy

Answer 24

energy stored in a body because of position

Question 25

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

Answer 25

work

Question 26

equation for work

Answer 26

work = force x distance

Question 27

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

Answer 27

joule

Question 28

power

Answer 28

rate at which work is done

Question 29

equation for power

Answer 29

power =

force x distance / time = work / time

Question 30

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

Answer 30

machine

Question 31

efficiency

Answer 31

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

Question 32

what are the 6 simple machines

Answer 32

inclined plane
wedge
screw
lever
pulley
wheel and axle

Question 33

what is a compound machine

Answer 33

combo of two or more simple machines

Question 34

inclined plane

Answer 34

slanted surface used to raise an object

Question 35

wedge

Answer 35

moving inclined plane

Question 36

screw

Answer 36

inclined plane wrapped around a cylinder

Question 37

lever

Answer 37

free to move around a fulcrum when force is applied

Question 38

pulley

Answer 38

chain or rope wrapped around a wheel

Question 39

wheel and axle

Answer 39

lever than rotates in a circle