Circular Motion: Master Centripetal Force and Acceleration

Question 1

Which of the following is NOT a factor affecting the centripetal force needed for uniform circular motion?

Accepted Answer

Acceleration due to gravity

Answer

Mass of the object

Answer

Radius of the circular path

Answer

Speed of the object

Question 2

What is the direction of the centripetal force acting on an object moving in a circular path?

Accepted Answer

Towards the center of the circle

Answer

Away from the center of the circle

Answer

Tangential to the circle

Answer

Perpendicular to the circle

Question 3

Which of the following is NOT a condition for uniform circular motion?

Accepted Answer

Constant acceleration

Answer

Constant speed

Answer

Constant direction

Answer

Circular path

Question 4

What happens to the centripetal force when the speed of an object in uniform circular motion is increased?

Accepted Answer

It increases

Answer

It decreases

Answer

It remains the same

Answer

It becomes zero

Question 5

Which of the following is a vector quantity?

Accepted Answer

Centripetal acceleration

Answer

Period of a pendulum

Answer

Radius of a circle

Answer

Mass of an object

Question 6

An object moves in a circular path of radius r with uniform speed v. What is the magnitude of its centripetal acceleration?

Accepted Answer

v^2/r

Answer

v/r

Answer

vr

Answer

r/v

Question 7

Which of the following is a necessary condition for circular motion?

Accepted Answer

Presence of a net inward force

Answer

Presence of a frictional force

Answer

Absence of an acceleration

Answer

Motion with constant speed

Question 8

A particle moves in a circular path with a constant speed. Which of the following statements about its velocity and acceleration is true?

Accepted Answer

Velocity is constant, acceleration is inward

Answer

Velocity is constant, acceleration is zero

Answer

Velocity is changing, acceleration is zero

Answer

Velocity is changing, acceleration is inward

Question 9

A satellite orbits the Earth in a circular path. Which of the following forces provides the centripetal force necessary for the satellite's motion?

Accepted Answer

Gravitational force

Answer

Frictional force

Answer

Tension force

Answer

Magnetic force

Question 10

An object is whirled in a horizontal circle at the end of a string. The string suddenly breaks. What path will the object follow?

Accepted Answer

Move in a straight line tangent to the circle

Answer

Continue in a circular path

Answer

Move in a straight line towards the center of the circle

Answer

Move in an upward parabolic path

Question 11

A centrifuge is used to separate particles of different densities. Which of the following factors does NOT affect the effectiveness of the separation?

Accepted Answer

Temperature of the particles

Answer

Speed of rotation

Answer

Radius of the centrifuge

Answer

Density of the particles

Question 12

A car with a mass of 1000 kilograms travels at a constant speed of 20 meters per second around a flat circular track with a radius of 100 meters. Calculate the centripetal force acting on the car.

Accepted Answer

4000 N

Answer

2000 N

Answer

6000 N

Answer

8000 N

Question 13

What is the primary effect of centripetal force on an object traveling in a circular path?

Accepted Answer

Pulls the object towards the center of the circular path

Answer

Increases the object's speed

Answer

Enlarges the radius of the circular path

Answer

Reduces the radius of the circular path

Question 14

If an object moves in a circle at a constant speed, what happens to the centripetal force needed to keep it moving in a circle as the radius of the circle increases?

Accepted Answer

The centripetal force decreases.

Answer

The centripetal force increases.

Answer

The centripetal force stays the same.

Answer

The centripetal force cannot be determined without knowing the speed of the object.

Question 15

Which statement correctly describes the relationship between centripetal force and tangential force in circular motion?

Accepted Answer

Centripetal force is perpendicular to tangential force

Answer

Tangential force is not required for circular motion

Answer

Centripetal force is tangential to the circle

Answer

Tangential force is always greater than centripetal force

Question 16

A car travels around a circular track with a radius of 50 m at a speed of 20 m/s. Calculate the car's centripetal acceleration.

Accepted Answer

8 m/s²

Answer

2 m/s²

Answer

4 m/s²

Answer

16 m/s²

Question 17

A ball attached to a 1 m long string is swung in a horizontal circle. The tension in the string is 5 N. Determine the speed of the ball.

Accepted Answer

3.16 m/s

Answer

2 m/s

Answer

6 m/s

Answer

4 m/s

Question 18

A cyclist rounds a bend on a flat road. Which force provides the centripetal force required to keep the cyclist moving in a circle?

Accepted Answer

Frictional force between the tyres and the road

Answer

Gravitational force

Answer

Tension in the handlebars

Question 19

Which of the following is a scalar quantity in circular motion?

Accepted Answer

Speed

Answer

Displacement

Answer

Velocity

Answer

Acceleration

Question 20

A car is traveling at a constant speed around a curve. Which of the following statements accurately describes the car's centripetal acceleration?

Accepted Answer

The car has a constant centripetal acceleration

Answer

The car has a centripetal acceleration that varies in direction

Answer

The car has a zero centripetal acceleration

Answer

The car has a centripetal acceleration that varies in magnitude

Question 21

Which of the following is a real-world example of circular motion?

Accepted Answer

A planet orbiting the sun

Answer

A ball falling vertically

Answer

A car driving in a straight line

Answer

A roller coaster going up a hill

Question 22

The angular velocity of a rotating object is measured in:

Accepted Answer

Radians per second

Answer

Revolutions per minute

Answer

Degrees per second

Answer

Meters per second