Question 1:

Which of the following motions is an example of projectile motion?

A) A car moving on a straight road
B) A pendulum swinging back and forth
C) A ball thrown into the air
D) A spinning top

Show Answer

Explanation: The correct answer is C) A ball thrown into the air. Projectile motion refers to the motion of an object projected into the air, experiencing both horizontal and vertical components of motion under the influence of gravity.

Question 2:

Which of the following statements about circular motion is true?

A) Circular motion is always at a constant speed
B) Circular motion requires a centripetal force
C) Circular motion is not affected by the mass of the object
D) Circular motion always has a horizontal component of velocity

Show Answer

Explanation: The correct answer is B) Circular motion requires a centripetal force. In circular motion, an object continuously changes its direction, requiring a centripetal force directed towards the center of the circular path to keep it in motion.

Question 3:

What happens to the horizontal component of velocity in projectile motion?

A) It increases continuously
B) It decreases continuously
C) It remains constant
D) It becomes zero

Show Answer

Explanation: The correct answer is C) It remains constant. In projectile motion, the horizontal component of velocity remains constant throughout the motion as there is no force acting in the horizontal direction to change its value.

Question 4:

Which of the following statements is true for an object moving in a circle at a constant speed?

A) The object's velocity is constant
B) The object's acceleration is zero
C) The object experiences a net force in the direction of motion
D) The object's displacement is zero

Show Answer

Explanation: The correct answer is B) The object's acceleration is zero. In circular motion at a constant speed, the object's velocity is changing direction continuously, indicating a non-zero acceleration towards the center of the circle, known as centripetal acceleration.

Question 5:

What is the shape of the trajectory followed by a projectile in the absence of air resistance?

A) Parabolic
B) Linear
C) Circular
D) Elliptical

Show Answer

Explanation: The correct answer is A) Parabolic. In the absence of air resistance, a projectile follows a parabolic trajectory due to the combination of its horizontal and vertical motions.