Assessment Test - Physics (CBSE IX)

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Questions and Answers

What does a distance-time graph for uniform motion look like?

  • A zigzag line
  • A straight diagonal line (correct)
  • A curved line
  • A straight horizontal line

An object can have zero velocity while experiencing constant acceleration.

True (A)

Define acceleration.

Acceleration is the rate of change of velocity of an object.

The average speed of the car during the trip is _____ km/h.

<p>50</p> Signup and view all the answers

Match the following scenarios with their corresponding descriptions:

<p>Constant acceleration with zero velocity = An object at the highest point of its trajectory Acceleration with uniform speed = A car turning around a corner at a constant speed Acceleration in a perpendicular direction = A ball being thrown upwards</p> Signup and view all the answers

If a squirrel stays still while eating nuts, what does the part of the distance-time graph represent?

<p>Constant distance (A)</p> Signup and view all the answers

Acceleration only occurs when an object's speed increases.

<p>False (B)</p> Signup and view all the answers

What was the speed of the squirrel during its journey, if it moved at a steady pace?

<p>It is the slope of the distance-time graph.</p> Signup and view all the answers

What was the average velocity of Rajeev's trip from Delhi to Chandigarh and back, given the odometer readings?

<p>Zero (D)</p> Signup and view all the answers

What does the path of an object look like when it is in a uniform motion?

<p>Straight (B)</p> Signup and view all the answers

Match the type of motion with their corresponding examples:

<p>In the direction of motion = Motion of freely falling body Against the direction = Brakes applied to a train Uniform = Car moves through congested market Non-uniform = Train starts moving from a station</p> Signup and view all the answers

Displacement of an object can never be zero if the distance covered is not zero.

<p>False (B)</p> Signup and view all the answers

What is the definition of displacement?

<p>Displacement is the shortest distance between the initial and final position of an object.</p> Signup and view all the answers

The average velocity of Rajeev's trip was _____ km/h.

<p>0</p> Signup and view all the answers

Which of these scenarios depicts non-uniform motion?

<p>A train accelerating from a stop (A)</p> Signup and view all the answers

What is an example of motion occurring in a congested market?

<p>Non-uniform motion (C)</p> Signup and view all the answers

Flashcards

Displacement

The overall change in position of an object, considering both direction and magnitude.

Velocity

The rate at which an object changes its position over time, considering both speed and direction.

Acceleration

The change in velocity of an object over time.

Uniform Motion

A type of motion where an object covers equal distances in equal time intervals.

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Non-uniform Motion

A type of motion where an object's velocity changes over time.

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Distance

The total length of the path travelled by an object.

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Rest

A situation where an object has zero velocity and remains at a fixed point.

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Average Velocity Formula

When calculating average velocity, the total displacement must be divided by the time taken for that displacement.

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Distance-time graph for uniform and non-uniform motion

For uniform motion, the graph is a straight line with a constant slope representing the object's speed. For non-uniform motion, the graph is a curved line with a changing slope indicating varying speed.

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Average speed calculation

Average speed is calculated by dividing the total distance traveled by the total time taken. In this case, the car traveled 400 km in 8 hours, resulting in an average speed of 50 km/h or 13.9 m/s.

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Constant acceleration, zero velocity

An object with a constant acceleration can have zero velocity if it starts at rest and accelerates in the opposite direction of its initial acceleration or if it's at the peak of its trajectory in projectile motion.

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Acceleration with uniform speed

An object can move with uniform speed while experiencing acceleration if the acceleration is perpendicular to the object's motion. This is seen in circular motion where the object's speed remains constant but its direction changes constantly.

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Motion and acceleration in perpendicular directions

An object can move in one direction while accelerating in a perpendicular direction. An example is a projectile in motion, where gravity accelerates it downwards while the object moves horizontally.

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Squirrel moving away from the tree

The segment of the graph where the line is sloping upwards (increasing slope) represents the squirrel moving away from the tree.

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Point 6 meters from the tree

The point on the graph where the distance is 6 meters from the base of the tree is represented by the x-coordinate '6' on the distance axis.

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Squirrel not moving

The horizontal segment of the graph (constant distance) represents the period when the squirrel is not moving, eating the nuts.

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Study Notes

Assessment Test - Physics (CBSE IX)

  • Question 1 (1X4=4M): Rajeev traveled from Delhi to Chandigarh and back. The odometer reading was 4200 km at the start and 4460 km at the end of the trip. The trip took 4 hours and 20 minutes. Calculate the average velocity in km/h.

  • Question 2 (1X4=4M): Describe the path of an object in uniform motion.

  • Question 3 (1X4=4M): Match column I (Acceleration) with column II (Example). Options provided include: Motion of freely falling body, Car moves through congested market, Against the direction of motion, Brakes applied to train, Uniform, Non-uniform, and Train starts moving from a station.

  • Question 4 (1 Assertion/Reason): Displacement of an object can be zero even if the distance covered is not zero.

Section B (2X4=8M)

  • Question 5 (2X2=4M): Describe distance-time graphs for uniform and non-uniform motion.

  • Question 6 (2X2=4M): A car's odometer reads 2000 km at the start and 2400 km at the end of an 8-hour trip. Calculate average speed in km/h and m/s.

Section C (1X3=3M)

  • Question 7 (1X3=3M): Determine the possible situations for an object:
    • Constant acceleration with zero velocity,
    • Acceleration with uniform speed
    • Acceleration in perpendicular direction.Provide examples for each if applicable.

Section D (1X5=5M)

  • Question 8 (1X5=5M): A squirrel moves from a tree to some nuts, stays there, and returns to the tree. A graph of distance vs. time shows the squirrel's journey.
    • Identify the portion of the graph where the squirrel travels away from the tree.
    • Specify the graph point representing a distance of 6m from the tree base.
    • Determine the segment of the graph indicating no squirrel movement.
    • Identify the portion of the graph showing the squirrel returning to the tree.
    • Based on the graph, compute the squirrel's speed during the entire journey.

Section E (1X4=4M)

  • Question 9 (1X4=4M): Explain acceleration.
    • Define acceleration.
    • A car accelerates uniformly from 18 km/h to 36 km/h in 5 minutes. Find the acceleration.
    • Distinguish between acceleration and deceleration.
    • Give two examples of deceleration.

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