7.motion Flashcards
Which of the following statements is correct regarding types of motion?
Rectilinear motion involves movement in a straight line.
Circular motion is characterized by a constant distance from a fixed point.
Periodic motion involves movement that repeats after an interval of time.
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2, and 3
Answer:
d) 1, 2, and 3
Explanation:
Rectilinear motion is motion along a straight line, circular motion maintains a fixed radius from a center point, and periodic motion repeats after a fixed duration.
An object in circular motion has:
a) A variable distance from the center.
b) A fixed distance from a fixed point.
c) No specific point of reference.
d) Motion that never repeats.
Answer:
b) A fixed distance from a fixed point.
Explanation:
In circular motion, the object moves at a constant radius around a fixed point.
Which of the following is an example of periodic motion?
a) A car traveling in a straight line.
b) A pendulum swinging back and forth.
c) A stone rolling down a hill.
d) A child riding a bicycle on a flat road.
Answer:
b) A pendulum swinging back and forth.
Explanation:
Periodic motion involves repetitive movement at regular intervals, as seen in a swinging pendulum.
Q1. Consider the following statements regarding motion:
1 In rectilinear motion, the direction of the motion remains constant.
2 Circular motion is a special case of periodic motion.
3 Periodic motion always involves a fixed distance from a reference point.
Which of the above statements is/are correct?
a) 1 and 2 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2, and 3
Answer:
a) 1 and 2 only
Explanation:
Statement 1 is correct because in rectilinear motion, the path is a straight line, implying a constant direction.
Statement 2 is correct as circular motion (e.g., the rotation of a fan) repeats itself and is periodic.
Statement 3 is incorrect because periodic motion does not necessarily involve a fixed distance from a reference point (e.g., a pendulum swings back and forth but does not maintain a fixed distance).
Which of the following motions can be considered rectilinear?
1 A person walking along a straight path.
2 A ball rolling down a hill.
3 A bird flying in a straight line.
4 A satellite orbiting the Earth.
a) 1, 2, and 3 only
b) 1 and 3 only
c) 2, 3, and 4 only
d) All of the above
Answer:
b) 1 and 3 only
Explanation:
Rectilinear motion is movement along a straight path, as demonstrated by walking on a straight path or flying in a straight line.
Which of the following motions can exhibit both periodic and rectilinear characteristics simultaneously?
a) A car moving on a straight highway at a constant speed.
b) A soldier marching back and forth along a straight track.
c) A ball oscillating on a string (pendulum).
d) An artificial satellite in a circular orbit.
Answer:
b) A soldier marching back and forth along a straight track.
Explanation:
For a motion to be both periodic and rectilinear, it must occur in a straight line and repeat after a fixed interval.
A car moving straight at a constant speed is rectilinear but not periodic.
A pendulum exhibits periodic motion but is not rectilinear.
An artificial satellite undergoes circular motion, which is periodic but not rectilinear.
. Which of the following scenarios demonstrate non-uniform motion?
1 A cyclist speeding up while going downhill.
2 A pendulum swinging back and forth.
3 A train moving at a constant speed of 100 km/h.
4 A car halting abruptly at a traffic signal.
Options:
a) 1 and 2 only
b) 1, 2, and 4 only
c) 2, 3, and 4 only
d) 1, 3, and 4 only
Answer:
b) 1, 2, and 4 only
Explanation:
Non-uniform motion involves a change in speed or direction.
1: A cyclist speeding up implies non-uniform acceleration.
2: The pendulum’s velocity changes at each point of its swing, making it non-uniform.
4: Abruptly halting involves a deceleration (non-uniform motion).
3: The train’s motion is uniform as its speed does not change.
Consider the following pairs regarding motion types and their real-life examples:
Type of Motion Example
1. Translational Motion A. A football rolling on the ground
2. Rotational Motion B. A bicycle wheel in motion
3. Oscillatory Motion C. A child on a swing
Which of the following pairs is/are correctly matched?
a) 1 only
b) 1 and 2 only
c) 2 and 3 only
d) 1, 2, and 3
Answer:
d) 1, 2, and 3
Explanation:
Translational Motion (1-A): The football moves in a straight path across the ground, indicating translational motion.
Rotational Motion (2-B): The bicycle wheel rotates around its axis, demonstrating rotational motion.
Oscillatory Motion (3-C): The back-and-forth motion of a swing is a classic example of oscillatory motion.
Which of the following features of motion differentiate uniform motion from non-uniform motion?
1 The object covers equal distances in equal intervals of time in uniform motion.
2 Acceleration is always zero in uniform motion.
3 Non-uniform motion can involve changing direction, speed, or both.
Options:
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2, and 3
Answer:
d) 1, 2, and 3
Explanation:
1: Uniform motion involves equal distances in equal time intervals, while non-uniform motion does not.
2: Acceleration in uniform motion is zero as there is no change in velocity.
3: Non-uniform motion can exhibit variations in speed, direction, or both.
A pendulum completes one oscillation in 2 seconds. Which of the following statements regarding the pendulum’s motion is/are correct?
1 The motion is periodic.
2 The pendulum exhibits both rectilinear and oscillatory motion.
3 The motion depends on gravity and air resistance.
Options:
a) 1 only
b) 1 and 2 only
c) 1 and 3 only
d) 1, 2, and 3
Answer:
c) 1 and 3 only
Explanation:
1: The motion is periodic as it repeats at regular intervals (2 seconds).
2: The pendulum’s motion is oscillatory but not rectilinear, as it follows a curved path.
3: Gravity influences the restoring force, and air resistance affects the damping of the motion.
An object is said to exhibit circular motion when:
1 It moves such that its distance from a fixed point remains constant.
2 Its speed changes continuously.
3 It experiences an acceleration directed toward the center of the circle.
Options:
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2, and 3
Answer:
b) 1 and 3 only
Explanation:
1: Circular motion involves a constant radius from a fixed center.
2: Speed does not necessarily change; it may remain constant (e.g., uniform circular motion).
3: Centripetal acceleration always acts toward the center in circular motion
The Moon revolves around the Earth. Identify the correct combination of motions it exhibits:
1 Rotational motion
2 Rectilinear motion
3 Circular motion
4 Periodic motion
Options:
a) 1 and 4 only
b) 1, 3, and 4 only
c) 2 and 3 only
d) 1, 2, 3, and 4
Answer:
b) 1, 3, and 4 only
Explanation:
The Moon rotates on its axis (1: Rotational motion).
It revolves around the Earth in an elliptical path (approximated as 3: Circular motion).
This motion repeats periodically over approximately 27.3 days (4: Periodic motion).
Which of the following is a distinguishing factor between rectilinear motion and circular motion?
a) Rectilinear motion occurs only at constant speed, while circular motion involves acceleration.
b) In rectilinear motion, the direction is fixed, while in circular motion, the direction changes continuously.
c) Rectilinear motion can never be periodic, while circular motion is always periodic.
d) The speed in rectilinear motion remains constant, whereas it changes in circular motion.
Answer:
b) In rectilinear motion, the direction is fixed, while in circular motion, the direction changes continuously.
Explanation:
Rectilinear motion occurs in a straight line with a constant or varying speed but no change in direction.
Circular motion inherently involves continuous direction changes due to the curved path.
