Understanding motion is a fundamental concept in physics. It is intriguing how objects move, the path they follow, their speed, and what causes them to stop. This topic delves deep into the nuances of movement, particularly in a straight line. The concept, though seemingly simple, has profound implications and is the foundation of advanced studies in mechanics. To test your understanding of this pivotal topic, here are 15 multiple-choice questions:
1. Which quantity represents the rate of change of displacement?
Answer:
Explanation:
Velocity is defined as the rate of change of displacement with respect to time.
2. A body moving with constant velocity in a straight line has:
Answer:
Explanation:
If a body moves with constant velocity, its acceleration is zero.
3. What is the slope of a distance-time graph represent?
Answer:
Explanation:
The slope of a distance-time graph gives the speed of the object.
4. Which of these is a scalar quantity?
Answer:
Explanation:
Distance has only magnitude and no direction, making it a scalar quantity.
5. If a car moves with a uniform acceleration of 2 m/s^2, the distance covered by the car in 3 seconds is:
Answer:
Explanation:
Using s = ut + ½ at^2 (with initial velocity u = 0), s = 0.5 * 2 * 3^2 = 18 m.
6. The negative sign of velocity indicates:
Answer:
Explanation:
Negative sign in velocity indicates direction opposite to what is considered positive.
7. An object is said to be in uniform motion if:
Answer:
Explanation:
Uniform motion means consistent speed and direction.
8. A body is thrown vertically upwards. At its highest point:
Answer:
Explanation:
At the highest point, the velocity becomes zero but the acceleration due to gravity remains active.
9. The area under the velocity-time graph represents:
Answer:
Explanation:
The area under a velocity-time graph gives the distance traveled.
10. If a body moves in a straight line and each particle of the body moves through equal distances in equal intervals of time, it is called:
Answer:
Explanation:
In translational motion, all parts of the body move identically and in parallel paths.
11. Which of the following graphs represent an object at rest?
Answer:
Explanation:
A horizontal distance-time graph indicates that the object’s position doesn’t change with time, implying it’s at rest.
12. An object moving with a constant speed in a straight line covers:
Answer:
Explanation:
An object moving with a constant speed covers equal distances in equal intervals of time.
13. Which among these is a vector quantity?
Answer:
Explanation:
Displacement has both magnitude and direction, making it a vector quantity.
14. The numerical value of displacement can never be:
Answer:
Explanation:
Displacement is the shortest path between two points, so its value can never exceed the actual distance traveled.
15. An object is said to have a non-uniform motion when:
Answer:
Explanation:
Non-uniform motion is when an object covers different distances in equal time intervals or the same distance in different time intervals.