# Uniform Circular Motion MCQ Science

50 Questions 30 Mins

If you're looking to improve your understanding of physics, one important concept to learn is uniform circular motion. In this post, we will discuss what uniform circular motion is and how to use it in real-world situations. We'll also provide some examples so you can see this type of motion in action. Understanding uniform circular motion is an essential part of mastering physics, so don't miss out on this valuable information!

Uniform circular motion is defined as a type of motion where an object moves in a circle at a constant speed. The key word here is "constant." This means that uniform circular motion only occurs when an object's speed does not change as it moves around the circle. If an object's speed were to increase or decrease, then it would no longer be uniform circular motion.

One example of uniform circular motion is a car driving around a roundabout. The car's speed may vary as it enters and exits the roundabout, but while it is actually going around the circle, its speed should remain constant. Another example is a satellite orbiting the earth. The satellite's speed also remains constant as it circles the earth.

So how do we use uniform circular motion in the real world? One common application is in roller coasters. When a roller coaster goes around a loop, it is experiencing uniform circular motion. The key to making sure the roller coaster doesn't fly off the track is to make sure that its speed is constant.

Following are some of the multiple choice questions on the Uniform Circular Motion with answers that will help the students in developing their knowledge.

## Uniform Circular Motion MCQ

• 360 degrees

• 45 m/s
• 32 m/s
• 23 m/s
• 16 m/s

### 3. What can be said of an object in uniform circular motion?

• It has a constant velocity.
• It is an example of Newton's First Law in the absence of a force.
• It has a constant tangential speed.
• none of the choices given

### 4. Which one of the following statements concerning the two “gravitational constants” G, the universal constant, and g the magnitude of the acceleration due to the gravity is true?

• The value for G and g do not depend on location.
• The value of G is the same everywhere in the universe, but the value of g is not.
• The value of G and g are equal on the surface of any planet, but in general, vary with location in the universe.

• A
• B
• C
• D

### 7. Acceleration causes a change in velocity so acceleration can cause

• a change in speed only.
• a change in speed or direction.
• a change in direction only.
• All of above

• 0.25
• 0.5
• 2
• 4

• Twice
• Three times
• Four times
• half

• m/s
• m/s2
• m.s2
• m/s.s

### 11. What is the most direct cause of a car's centripetal acceleration as it rounds a curve?

• The force of the steering wheel
• The weight of the car.
• The normal force exerted by the road.
• The friction between the tires and the road.

### 12. What force keeps an object moving in a circle?

• centripetal force (inward)
• centrifugal force (outward)

• A
• B
• C
• D

### 14. Which statement is true about an object that is traveling in uniform circular motion?

• The speed of the object varies.
• The net force on the object is directed toward the center of the circular path.
• The direction of the object's velocity is constant.
• The net force on the object is directed away from the center of the circular path.

• 141.4

### 16. Which is true about centripetal force and centripetal acceleration?

• The centripetal acceleration is always pointing toward the center of an orbit and the centripetal force is always pointing outward
• The centripetal acceleration is always pointing outward from the center of an orbit and the centripetal force is always pointing inward
• The centripetal acceleration is always pointing toward the center of an orbit and the centripetal force also pointing toward the center but in a totally different location
• The centripetal acceleration is always pointing toward the center of an orbit and the centripetal force also pointing toward the center and in the same exact location as the centripetal acceleration

### 17. If an object is spinning around on a string and the string was suddenly cut, the object would move in a

• curved path
• straight line

• 2.05 N
• 2.57 N
• 2.90 N
• 3.13 N

### 19. When an object is moving in a circle, its linear velocity is often called its __________ velocity.

• centripetal
• tangential
• gravitational
• centrifugal

### 20. What happens to the centripetal force exerted on an object if you triple the velocity?

• it increases to 3X
• it decreases to 6X
• it increases to 6X
• it increases to 9X

### 21. A horse gallops around a circular arena. The centripetal force on the horse is ___.

• directed outward
• tension
• directed toward the center of the arena
• 9.8 N

### 22. What happens if you let go of the string when you spin the stopper around your head?

• the stopper continues moving in a circle
• the stopper moves in a straight line

• A
• B
• C
• D

### 25. If a stone is tied to the end of a string and whirled in a circle, the tension in a string provides:

• Centripetal force
• Centrifugal force
• Pressure
• Reaction

### 26. A rubber stopper on the end of string is swung steadily in a horizontal circle. In one trial, it moves at speed v in a circle of radius r. In a second trial, it moves at a higher speed 3v in a circle of radius 3r. In the second trial the acceleration is

• the same as in the first trial
• three times larger
• one-third as large
• nine times larger

### 27. Two masses m and M are separated by a distance d. If the distance between the masses is increased to 3d, how does the gravitational force between them change?

• becomes 1/3 as great
• 1/9 as great
• 3x greater
• 9x greater

• 90⁰
• 45⁰
• 60⁰
• 30⁰

• A
• B
• C
• D

• A
• B
• C
• D

• 2.5 N
• 5.0 N
• 10.0 N
• 20.0 N

### 33. The velocity is always _____ to the line of a circle.

• outwards
• towards the center
• tangent
• faster

• 3.0 N
• 6.0 N
• 9.0 N
• 1.5 N

• A
• B
• C
• D

### 36. If a ball is swinging at the end of a rope and the rope is suddenly cut, assuming there is no gravity, what best describes the path it will take?

• It will fly in a straight line forward from where it was cut
• It will fly in a curved line away from the circle
• It will fly inward toward the circle
• None of these

### 37. An object in uniform circular motion is (choose all that apply)

• traveling at a constant speed
• accelerating
• not accelerating
• Both A & B

### 38. For an object to be in uniform circular motion the direction of the acceleration is

• perpendicular to the direction of travel.
• parallel to the direction of travel.
• diagonally inwards between the direction of travel and the center of the circle.
• diagonally outwards away from the center of the circle but in the same direction of travel.

### 39. A spin balancer rotates the wheel of a car at 500 revolutions per minute. What is the angular speed in degrees per second?

• 16.67 deg / sec
• 6,000 deg / 1 sec
• 3,000 deg / 1 sec
• 180,000 deg / 1 sec

• 0.38
• 1.23
• 0.55
• 1.66 N

• 565.5 m/s
• 180 m/s
• 282.7 m/s
• 90 m/s

### 42. The wheels of a car have radius 0.330 m. and are rotating at 600.0 rpm. Determine the speed of the car in miles/hour to the nearest tenth. (Determine ω (angular velocity) first and then use v=ω⋅r and convert to km/hour)

• 11.88 km/hour
• 685.4 km/hour
• 74.64 km/hour
• 74640 km/hour

• 4.1 kg
• 3.6 kg
• 2.5 kg
• 1.8 kg

### 44. Two bugs ride a turntable which is rotating at a constant rate of 4 rad/s. Bug A is at a radius of 4 cm, while bug B is at a radius of 8 cm. Which of the following is true?

• Bug A has a greater angular velocity
• Bug B has a greater angular velocity.
• Bug A has a greater linear velocity.
• Bug B has a greater linear velocity.

### 45. Determine the central angle if the arc length is 10 cm and the radius is 5 cm. Convert to degrees.

• not possible ... "s" is too small
• ≈ 114.6°
• 360°

### 46. Centripetal acceleration acts towards the ___________ of the circular motion

• centre
• circumference

### 47. Centripetal force is...

• the resultant force acting on a body moving at constant speed in a circle
• the outwards force acting on a body moving at constant speed in a circle

• 2.4 m/s
• 3.6 m/s
• 3.9 m/s
• 4.2 m/s

• 188.50 m/s
• 188.70 ms-1

• 10.75 ms-1
• 10.95 m/s