Circular Motion

A 0.023 kg beetle is sitting on a record player 0.15 m from the center of the record. If it takes0.070 N of force to keep the beetle moving in a circle on the record, what is the tangential speed of the beetle?

0.68

a wrecking ball has a mass of 650kg it swings from

1.3

a child on a spinning playground ride is 0.36 m from the center

23 kg

a remote controlled plane has a mass of 0.386

28

Inertia causes objects to want to continue moving in a straight line. Centripetal force pushes or pulls objects toward the center of the circle.

The combination if inertia and centripetal force causes objects to mive with circular motion. Without inertia objects experiencing centripetal force would fall into the center of the circle

How are uniform circular motion maps the same as linear motion maps?

Time is represented by dots at 1-second intervals. NOT Start position is represented by an x. NOT Velocity vectors change length as the object's speed changes. Velocity vectors change direction as the object's direction changes. NOTAcceleration vectors always point in the same direction.

an object is represented by the dot on the motion msp

a ball twirled on a string that just broke

centripetal force

a force directed toward the center of a circle

motion map

an image that represents the position, velocity, and acceleration of an object at one second intervals

Johanna makes the table below to organize her notes about centripetal forces. Which type of force should she place in the cell marked X? tension gravity friction normal

gravity

what is the direction of the centripetal force when applied to an ojbect

perpendicular to an objects motion

An object is represented by the dot on a motion map. What is the best description for the motion of this object?

standing still

Newton's Second Law

the law that states that the total net force acting on an object is equal to mass times acceleration

a centripetal forcre causes circular motion because it acceleates an object

toward the center of a circle which changes the direction o the motion but not the speed

which motion map shows an object in uniform circuar motion

v w y

scientists are making plans to put a probe in orbit around earth

x

centrifugal force

a fictitious force that tends to throw an object off when the object is rotating in a non-inertial frame of reference. Objects want to keep going straight but the centripetal force pushes or pulls the objects toward the center of the circle. The feeling of being pushed or pulled to the outside of a circle comes from inertia. There is no force acting to pull or push objects away from the center of the circle

Tangential Speed Formula

if the radius and time are known: vt= 2pi r/t if the radius, centripetal force, and mass are known: Fc=mv^2/r

How does centripetal force cause circular motion?

it acts at a right anglr to the objects motion and causes the object to constantly change direction

what must be true of a force that causes an oject to move in a circular moton

it acts perpendicualr to the velocity and is directed toward the center of the circke

Centripetal Force formula

Fc=mv^2/r

Jesse is swinging Miguel in a circle at a tangential speed of 3.50 m/s. If the radius of the circle is0.600 m and Miguel has a mass of 11.0 kg, what is the centripetal force on Miguel? Round to the nearest whole number.

225

a ball that has a mass of 0.25 kg spins in a circle

23

Caleb is swinging Rachel in a circle with a centripetal force of 533 N. If the radius of the circle is 0.75 m and Rachel has a mass of 16.4 kg, how fast is Rachel moving? Round to the nearest tenth.

4

Lucia wants to change the motion map shown so that it shows uniform circular motion. What change should Lucia make? She should change the length of each vector that is tangent to the circle so that it is the same as the vector pointing toward the center at that point. She should change the direction of the vectors that are toward the center of the circle so that each points tangent to the circle opposite the existing tangent vectors. She should change the direction of the vectors that are toward the center of the circle so that each points away from the center of the circle. She should change the lengths of the vectors that point toward the center so that each is the same length

she should change the lengths of the vectors that point toward the center so that each is the same length

inertia

the natural tendency of objects to resist a change in motion

Theresa is swinging a 4.0 kg ball on a 1.2 m long rope with a tangential speed of 1.8 m/s. What is the centripetal force exerted on the rope? Round to the tenths place.

10.8 n

Julius competes in the hammer throw event. The hammer has a mass of 7.26 kg and is 1.215 m long. What is the centripetal force on the hammer when it has a tangential speed of 31.95 m/s? The answer is rounded off to the nearest whole number. 190 N 840 N 1,400 N 6,100 N

6100

how do inertia and centripetal force combine to keep an object moving

centripetal force acts toward the center of the circle and inertia keeps the object mpving forawrd

in a uniform circular motion map what is always true

acceleration vectors point toward the center of the circle velocity vectors are the same length

Which statements about inertia and centripetal force are correct?

inerta is always present. NOT Inertia causes objects to continue moving in circles. NOT Centripetal force is always present. Centripetal force pulls objects toward the center of a circle. Inertia and centripetal force cause circular motion.

As a truck rounds a curve, a box in the bed of the truck slides to the side farthest from the center of the curve. This movement of the box is a result of .

inertia

an object is in circular motion how will the object behave if the centiripetal force is removed

it would move in a line tangent to the circular path

Without inertia, how would an object that is experiencing a centripetal force behave? It would move in a line away from the circle's center. It would move in a line toward the circle's center. It would move in a curved, circular path. It would move in a line tangent to the circular path.

it would move in a line toward the circles center

Suchita makes a table to identify the variables used in the equations for centripetal force. What quantities belong in cells X and Y? X: tangential speed Y: radius X: radius Y: tangential speed X: centripetal force Y: mass X: mass Y: centripetal force

x; radius y; tangential speed