Centripetal Force and Centripetal Acceleration

Centripetal Force and Centripetal Acceleration

Multiple Choice

Which represents the acceleration of the ball?

• A

• B

• C

• D

Multiple Choice

The centripetal force of satellites is similar to gravitational force because they are both a net force towards the center of earth.

• TRUE

• FALSE

Centripetal Force is

the force on an object that makes go in a circle. The force is always directed toward the center of the circle.

F=mv²/r

Multiple Choice

What force is needed to make an object move in a

circle?

• kinetic friction

• centripetal force

• static friction

• weight

Multiple Choice

When an object experiences uniform circular

motion, the direction of the net force is?

• in the same direction as the motion of the object

• in the opposite direction of the motion of the object

• is directed toward the center of the circular path

• is directed away from the center of the

  circular path

Multiple Choice

A car with a mass of 1800 kg goes around an 18

m radius turn at a speed of 35 m/s. What is the

centripetal force on the car?

• 25,000 N

• 75,000 N

• 250,000 N

• 122,500 N

Multiple Choice

A ball on a string spins in a horizontal circle of

radius 2.5 m with a speed of 3.0 m/s. The tension in

the string is 5.4 N. What is the mass of the ball?

• 1.5 kg

• 3.6 kg

• 3.5 kg

• 4.8 kg

Multiple Choice

A 75 kg mass is attached to the end of a 5.0 m

long metal rod string which rotates in a horizontal

circular path. If the maximum force that the rod can

withstand is 8500 N. What is the maximum speed

that the mass can attain without breaking the rod?

• 15 m/s

• 24 m/s

• 25 m/s

• 110 m/s

CENTRIPETAL ACCELERATION

Even though the velocity of the circle motion remains constant, the object is accelerating because it is constantly changing direction.

The formula for Centripetal Acceleration is:

a_c = v²/r

Multiple Choice

An object moves in a circular path at a constant

speed. Compare the direction of the object's

velocity and acceleration vectors.

• Both vectors point in the same direction

• The vectors are perpendicular

• The vectors point in opposite directions

• The question is meaningless, since the

  acceleration is zero

Multiple Choice

What type of acceleration does an object moving

with constant speed in a circular path experience?

• free fall

• linear acceleration

• constant acceleration

• centripetal acceleration

Multiple Choice

Consider a particle moving with constant speed

such that its acceleration of constant magnitude

is always perpendicular to its velocity.

• It is moving in a circle

• It is moving in a parabola

• None of the above is definitely true

  all of the time

Multiple Choice

An object is traveling with a velocity of 6.0 m/s

in a circular path whose radius is 4.0m. What is the

magnitude of it centripetal acceleration?

• 3.0 m/s²

• 6.0 m/s²

• 9.0 m/s²

• 13.0 m/s²

Multiple Choice

An object is traveling with a velocity of 6.0 m/s

in a circular path. It's acceleration is 3.0 m/s². What

is the radius of its path?

• 12 m

• 20 m

• 4 m

• 18 m

Multiple Choice

An object is traveling in a circular path

whose radius is 65m. Its acceleration is 3.0 m/s² .

What is its velocity?

• 14 m/s

• 7 m/s

• 8 m/s