Solved Questions on Motion and its Types
1. In an experiment on damped oscillation, what could be the purpose of adding damping forces like friction?
a) To make the motion uniform
b) To make the motion random
c) To slow down and eventually stop the oscillations
d) To increase the amplitude of oscillation
Answer: c) The purpose of adding damping forces like friction in an experiment on damped oscillation is to slow down and eventually stop the oscillations. This allows for the study of the effects of damping on the motion of the object.
2. A person walks 10 metres north, then turns around and walks 6 metres south. What is his displacement?
a) 4 metres north
b) 4 metres south
c) 16 metres north
d) 16 metres south
Answer: b) Displacement is the change in position from the starting point to the ending point, taking into account both magnitude and direction.
To find the displacement, we need to consider the net effect of the person’s movements. Since they moved 10 meters north and then 6 meters south, the net displacement is the difference between these two distances. In this case, the net displacement is 10 metres - 6 metres = 4 metres south.
3. Select the statement that accurately describes the difference between random motion and non-uniform motion.
a) Random motion occurs only in gases, while non-uniform motion occurs in liquids and solids.
b) Random motion has no specific pattern, while non-uniform motion has a predictable pattern.
c) Random motion is unpredictable, while non-uniform motion involves changing speed or direction.
d) Random motion is faster than non-uniform motion.
Answer: c) Random motion refers to the motion of an object that has no specific pattern or predictable path. It is characterized by unpredictable changes in speed and direction. On the other hand, non-uniform motion refers to the motion of an object where the speed or direction changes over time. While non-uniform motion can have variations, it still follows a certain pattern or trend.
4. In Simple Harmonic Motion (SHM), the restoring force is directly proportional to:
a) The object's velocity
b) The object's displacement from the centre
c) The object's mass
d) The object's acceleration
Answer: b) In Simple Harmonic Motion (SHM), the restoring force is directly proportional to the object's displacement from the centre. When the object is moved away from its equilibrium position, the restoring force tries to bring it back to the centre. The farther the object is displaced, the stronger the force becomes, making it directly related to the object's displacement.
5. Two friends start at the same point and walk in different directions. What can be said about their displacements?
a) They will be equal in magnitude and opposite in direction.
b) They will be equal in magnitude and direction.
c) They will be different in magnitude and opposite in direction.
d) They will be different in magnitude and direction.
Answer: c) When two friends start at the same point and walk in different directions, their displacements will be different in magnitude because they are moving in different directions and covering different distances. The displacements will be opposite in direction because they are moving away from each other.
FAQs
1. What are the different types of motion?
There are mainly three types of motion:
- Linear Motion: This is when an object moves in a straight line, like a car traveling on a highway.
- Circular Motion: Circular motion occurs when an object moves around a fixed point, like the Earth revolving around the Sun.
- Rotational Motion: Rotational motion is when an object spins or rotates around its axis, such as a spinning top or a merry-go-round.
2. What is Speed and Velocity?
Speed is a measure of how quickly a thing moves. It is calculated by multiplying the distance travelled by the time spent.
Velocity is similar to speed, except it also includes direction. It not only shows us how quickly something is traveling, but also in what direction.
3. What are the differences between oscillatory and periodic motion?
Oscillatory Motion:
- Oscillatory motion refers to the back-and-forth movement of an object around a central point or equilibrium position.
- The motion alternates between two extreme points, crossing the equilibrium position multiple times.
- Examples include the swinging of a pendulum, the vibration of a guitar string, or the bobbing of a buoy in the ocean waves.
Periodic Motion:
- Periodic motion refers to any motion that repeats itself at regular intervals of time.
- It may or may not involve oscillation around a central point.
- Periodic motion can be oscillatory, but it can also include other repetitive motions such as circular motion or rotational motion.
- Examples of periodic motion include the Earth's rotation on its axis, the orbit of planets around the Sun, or the spinning of a wheel.
4. What is Inertia?
Inertia refers to an object's tendency to resist changes in motion. It is the reason that objects remain at rest or move at a steady speed unless moved upon by an external force.
5. How motion is measured?
Motion may be measured with many kinds of devices, including rulers, stopwatches, speedometers, and even sensors in modern technology.
