Imp Questions For All Chapters – General Science Class 7
Motion, Force and Work
Short Questions
1. What is motion?
→ Motion is the change in position of an object with time.
2. What causes a change in motion?
→ Force causes a change in motion.
3. What is distance?
→ Distance is the total length traveled by an object, regardless of direction.
4. What is displacement?
→ Displacement is the shortest distance between the starting and ending points in a straight line.
5. What is speed?
→ Speed is the distance traveled per unit time.
6. What is the formula for speed?
→ Speed = Distance / Time
7. What is velocity?
→ Velocity is speed in a specific direction.
8. What is acceleration?
→ Acceleration is the change in velocity per unit time.
9. What is the unit of speed and velocity?
→ The unit is metres per second (m/s).
10. What is the difference between speed and velocity?
→ Speed has no direction, but velocity has both speed and direction.
11. What is the SI unit of force?
→ The SI unit of force is Newton (N).
12. What is Newton’s First Law of Motion?
→ A body at rest stays at rest, and a body in motion stays in motion unless a force acts on it.
13. What is work?
→ Work is done when a force is applied and the object moves in the direction of the force.
14. What is the formula for work?
→ Work = Force × Displacement
15. What is the SI unit of work?
→ The SI unit of work is Joule (J).
Long Questions
1. What is displacement? How is it different from distance?
→ Displacement is the shortest straight-line distance from start to end, while distance is the total path traveled.
2. What is the difference between uniform and non-uniform motion?
→ In uniform motion, an object moves at a constant speed. In non-uniform motion, its speed keeps changing.
3. Explain speed and velocity with examples.
→ A car moving 40 km/h has speed, but if it moves 40 km/h north, it has velocity. Velocity includes direction, speed does not.
4. What is Newton’s First Law of Motion?
→ If no force acts on an object, it remains at rest or continues moving at a constant speed. Example: A book stays on a table until moved.
5. What is acceleration? Give an example.
→ Acceleration is the increase or decrease in velocity. Example: A car speeds up or slows down when pressing the accelerator or brakes.
6. What is force? How does it affect motion?
→ Force is a push or pull that changes an object’s speed, direction, or shape. Example: A football moves when kicked.
7. How do we calculate work?
→ Work is calculated using Work = Force × Displacement. If there is no movement, no work is done.
8. What is the relationship between force, displacement, and work?
→ Work is done when force is applied and the object moves in the direction of the force. Example: Pulling a cart does work.
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