pathshaala: Physics worksheet class 9

Definitions:
- Define the following terms:
  - Distance
  - Displacement
  - Speed
  - Velocity
  - Acceleration
Numerical Problems:
- A car travels 60 km in 2 hours. What is its average speed?
- A body starts from rest and accelerates uniformly at 5 m/s² for 10 seconds. Find:
  - Final velocity
  - Distance covered
Graphical Question:
- Draw a velocity-time graph for:
  - Uniform motion
  - Uniform acceleration

Short Answer Questions:
- State Newton's three laws of motion with examples.
- Explain the concept of inertia with an everyday example.
Numerical Problems:
- A force of 10 N acts on a body of mass 2 kg. Calculate its acceleration.
- A ball of mass 0.5 kg is dropped from a height of 10 m. Find its velocity just before it hits the ground. (Take $g = 9.8 \, \text{m/s}^2$ ).
Experiment-Based Question:
- Describe an activity to demonstrate Newton’s third law of motion.

Short Answer Questions:
- State the universal law of gravitation.
- Explain why objects fall towards the Earth.
Numerical Problems:
- Two objects with masses 5 kg and 10 kg are separated by a distance of 2 m. Calculate the gravitational force between them. (Take $G = 6.674 \times 10^{-11} \, \text{Nm}^2/\text{kg}^2$ ).
- A stone is thrown upwards with a velocity of 20 m/s. Calculate the maximum height reached.

Definitions:
- Define:
  - Work
  - Power
  - Kinetic Energy
  - Potential Energy
Numerical Problems:
- A 50 kg object is lifted to a height of 10 m. Calculate the work done. (Take $g = 9.8 \, \text{m/s}^2$ ).
- An object of mass 2 kg is moving with a velocity of 3 m/s. Calculate its kinetic energy.

Short Answer Questions:
- Define the following terms:
  - Frequency
  - Wavelength
  - Amplitude
- How does the speed of sound vary with temperature?
Numerical Problems:
- A sound wave has a frequency of 500 Hz and a wavelength of 0.68 m. Calculate its speed.

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