Motion Vocabulary

Question 1

Gravity

Answer 1

the force that pulls all things toward the center of the earth

Question 2

How fast to falling objects increase their speed

Answer 2

32 f/s or g (gravity) each second they fall

Question 3

What slows down falling objects?

Answer 3

the atmosphere

Question 4

Drag (in relation to gravity & falling objects)

Answer 4

the slowing action

Question 5

Velocity formula

Answer 5

velocity (ft. per second) = 32 x time (seconds) v = gt

Question 6

Center of gravity

Answer 6

a point at which the entire weight of an object appears to be centered an object will balance or if it is suspended from or supported underneath–its center of gravity

Question 7

Inertia

Answer 7

the property of objects to resist a change in motion big problem when moving large objects Newton’s 1st Law of Motion or Law of Inertia

Question 8

Momentum

Answer 8

the measure of the impact of a moving body when it hits another body momentum = (mass)(velocity) f = ma aka Newton’s Second Law

Question 9

Effort

Answer 9

required to start a body in motion and the same effort is needed to stop it

Question 10

Newton’s 3rd Law of Motion

Answer 10

for every action has an equal and opposite reaction

Question 11

Newton’s 1st Law of Motion

Answer 11

every object will remain at rest unless acted upon by an outside force

Question 12

Newton’s 2nd Law of Motion

Answer 12

The greater the mass of the object, the more force it will take to accelerate the object. F = ma

Question 13

Speed

Answer 13

term used to define how fast an object is traveling speed is a term used when direction is NOT important

Question 14

Acceleration

Answer 14

the rate at which the speed changes (if moving along a straight line or path) positive if the object is gaining speed and negative if the object is losing speed

Question 15

How do you determine how many miles a car is traveling?

Answer 15

miles per hour mph = feet per second x 0.682 or if you want to change miles per hour into feet per second.. ft. per second = mph x 1.47 mph = ft. per second x 0.682

Question 16

Velocity

Answer 16

the speed of an object in a given direction Velocity is both the speed or an object and the direction in which it is traveling

Question 17

Speed Formula

Answer 17

speed (ft. per second) = distance (ft) / time (seconds) speed (miles per hour) = distance (miles) / time (hours) speed (mph) = (ft. per sec.) x 60 (sec) x 60 (min) __________________________________ 5280 ft. in a mile)

Question 18

Velocity Formula

Answer 18

velocity = distance / time

Question 19

What are centrifugal force and centripetal force used to describe?

Answer 19

It is use to describe what happens when objects travel along a curve or circle

Question 20

Centripetal Force

Answer 20

Also known as center seeking force When a car travels along a curve, the tires supply the friction to keep the car traveling along the curve

Question 21

Centrifugal force

Answer 21

center-fleeing force If you twirl a ball on a string and then let go of the string, the balls travels in a straight line away from the circle Tangent to the curve causes an object (ball) to move in a straight line away from the circle

Question 22

Centrifuge

Answer 22

a high speed rotating device used to separate suspended materials

Question 23

Spinning Gyroscope

Answer 23

resists any effort to change its location or rotation plane

Question 24

Gyroscope

Answer 24

used in navigation equipment and vehicles that require stabilization

Question 25

Flywheel

Answer 25

similar to a gyroscope heavy spinning cylinder used to store mechanical energy

Question 26

Torque

Answer 26

a force which produces a turning effect measured in foot pounds torque (ft.lbs) = force (pounds) x torque arm (feet) torque (in. lbs) = force (pounds) x torque arm (inches)

Question 27

Friction

Answer 27

a force which tends to interfere with movement between two surfaces FRICTION IS GREATEST JUST BEFORE THE MOVEMENT STARTS once the object is moving, friction decreases

Question 28

Why does friction make mechanical devices less efficient?

Answer 28

more energy is used to accomplish a certain amount of work

Question 29

Rolling Friction

Answer 29

the resistive force that slows objects that are rolling much less resistive force than sliding friction ball bearings or roller blades

Question 30

Drag

Answer 30

the resistance caused by the motion of objects through air or water acts opposite to the direction of the motion slows the plane down

Question 31

When drag increases, way also increases with it?

Answer 31

the velocity of body

Question 32

Lift

Answer 32

the force that directly opposes the weight of an airplane and holds the airplane in the air acts perpendicular to the direction of the vehicles motion used to stabilize and control the direction of the flight

Question 33

thrust

Answer 33

The force which moves the airplane through the air The Engine & Propellers are responsible for moving the plane forward Think of Newton’s Third Law of Motion!

Question 34

Pressure drag

Answer 34

accounts for much of the drag as objects move through the air or water molecules or air or water build up near the frontal area of the object depends on the shape of the body also known as profile drag

Question 35

Drafting

Answer 35

when the air behind a vehicle forms a low pressure area a second vehicle follows directly behind the first less frontal pressure and less use of energy to travel