Physics Chapter: Displacement and Velocity

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Questions and Answers

What is included in the topic of Measurements?

Acceleration and velocities

Energy and work

Types of forces

Fundamental and derived units (correct)

Which concept explains the relationship between force and inertia?

Work-energy theorem

Newton's first law of motion (correct)

Conservation of energy

Projectile motion

What is the primary focus of the topic 'Force of Gravity'?

Mass and Weight, and variations of gravity (correct)

Angular momentum conservation

Types of frictional forces

Linear motion and friction

Which equation would describe motion under gravity?

Equations of motion Signup and view all the answers

What does the topic 'Work, Energy and Power' primarily discuss?

Definitions and principles of work and energy Signup and view all the answers

Which topic within Physics involves the principle of conservation of angular momentum?

Centre of mass and rotational motion Signup and view all the answers

Which term describes the rate of doing work?

Power Signup and view all the answers

What is the result of the conservation of momentum?

Total momentum before collision equals total momentum after collision Signup and view all the answers

Which technological application is NOT typically associated with space technology?

Telecommunication systems Signup and view all the answers

What is the primary focus of animal husbandry?

Domestic animal breeding and care Signup and view all the answers

Which of the following is a component of computer hardware?

RAM Signup and view all the answers

Which of the following technologies is related to networking devices?

Modem Signup and view all the answers

What is a key feature of pervasive computing?

Integration of computing into everyday objects Signup and view all the answers

Which aspect is essential for ensuring security in IT?

Data encryption and protection measures Signup and view all the answers

Which of the following best describes the concept of 'near field communication'?

Short-range communication between devices Signup and view all the answers

What primary purpose do Indian Remote Sensing satellites serve?

Agricultural monitoring and resource management Signup and view all the answers

What does average velocity represent in relation to displacement?

The change in position over time Signup and view all the answers

How is average acceleration calculated?

Change in velocity divided by the time interval Signup and view all the answers

What does the gradient of the displacement-time graph represent?

Average velocity of the object Signup and view all the answers

What is the formula for calculating average velocity?

(Final velocity + initial velocity) / 2 Signup and view all the answers

If the displacement of a cyclist from point A to point C is represented, what is the relationship with time?

Displacement increases with time if velocity is positive Signup and view all the answers

How do you express average acceleration mathematically?

a = (v - v0) / (t - t0) Signup and view all the answers

What does the term 'rate of change of velocity' refer to?

Acceleration Signup and view all the answers

In a displacement vs. time graph, a horizontal line indicates what?

No movement Signup and view all the answers

What does a change of system of units affect in a measurement?

The precision of the measurement Signup and view all the answers

Which device is used for measuring small lengths or thicknesses accurately?

Screw gauge Signup and view all the answers

What expression represents the dimensions of force in fundamental quantities?

[MLT^{-2}] Signup and view all the answers

Which part of a vernier calliper is responsible for fine measurement?

Vernier scale Signup and view all the answers

Which of the following measuring devices typically measures external and internal diameters?

Vernier calliper Signup and view all the answers

In which format is a number written when using scientific notation?

x × 10^b Signup and view all the answers

What is the function of the screw in a vernier calliper?

To provide fine adjustments Signup and view all the answers

Which of the following statements is true regarding significant digits in measurements?

Trailing zeros in a decimal are significant digits. Signup and view all the answers

What is the formula for the relative velocity of object B with respect to object A when both are moving in the same direction?

VAB = VA - VB Signup and view all the answers

When body B is thrown downward, which direction is considered positive according to the sign convention?

Downward direction Signup and view all the answers

What is the correct kinematic equation to relate the final velocity, initial velocity, and gravity when an object is thrown downward?

v = u + gt Signup and view all the answers

What happens to the formula for relative velocity when object B moves in the opposite direction of object A?

VAB = VA + VB Signup and view all the answers

Which of the following kinematic equations can be used for an object moving freely under gravity?

v2 = u2 + 2gh Signup and view all the answers

Study Notes

Displacement and Velocity

The displacement of a cyclist from point A to point C is represented by the area under the velocity-time graph.
The gradient (slope) of the velocity-time graph represents the average velocity of the cyclist.
Average velocity equals the change in displacement divided by the change in time.
Average velocity can also be calculated by averaging the initial and final velocities: (final velocity + initial velocity)/2.

Acceleration

Average acceleration is defined as the change in velocity divided by the time interval.
The formula for average acceleration is: ∆v / ∆t, where ∆v is the change in velocity, and ∆t is the time interval.

Relative Motion

Relative motion describes the motion of an object relative to another object, whether both objects are in motion or one is stationary.
The relative velocity of object B with respect to object A is calculated by subtracting the velocity of object A from the velocity of object B: VBA = VB - VA.
When objects move in the same direction, the relative velocity is the difference between their velocities.
When objects move in opposite directions, the relative velocity is the sum of their velocities.
When objects move at an angle to each other, the relative velocity is determined using vector addition.

Motion Under Gravity

When an object is thrown downwards, the initial motion is downward.
In this case, downward direction is considered positive, and upward direction is considered negative.
The kinematic equations for motion under gravity are:
- v = u + gt
- h = ut + ½gt²
- v² = u² + 2gh

Significant Figures

The number of significant digits in a measurement does not change when the system of units is changed.
When a number is written in scientific notation (a × 10^b), the power of 10 does not affect the determination of significant figures.
The smallest division on the scale of a measuring instrument is known as the resolution, which represents the uncertainty associated with the measurement.

Dimensions of Physical Quantities

Dimensions represent the powers of the fundamental quantities (mass, length, and time) required to express a physical quantity.
The dimensional formula is an expression that represents a physical quantity in terms of these fundamental quantities.
For example, the dimensions of force can be expressed as [MLT^-2], where "M" represents mass, "L" represents length, and "T" represents time.

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Description

This quiz covers the concepts of displacement, velocity, and acceleration as discussed in physics. It explains how to calculate average velocity and acceleration, as well as the principles of relative motion. Test your understanding of these key topics in motion.