Force and Laws of Motion — Flashcards
Gujarat Board · Class 9 · Science
22 flashcards for Force and Laws of Motion (Gujarat Board Class 9 Science) to test yourself on key terms and facts.
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What is force? How can we define it based on our everyday experience?
Answer
Force is a push, hit, or pull that can change the state of motion of an object. Though we cannot see, taste, or feel force directly, we can always observe its effects. Force can change the speed of an…
What are balanced forces? Give an example.
Answer
Balanced forces are equal forces acting on an object in opposite directions that cancel each other out. They do not change the state of rest or motion of an object. Example: A wooden block pulled by e…
What are unbalanced forces and what do they cause?
Answer
Unbalanced forces occur when the net force acting on an object is not zero. They cause a change in the state of motion of an object - either changing its speed, direction, or both. An unbalanced force…
State Newton's First Law of Motion.
Answer
An object remains in a state of rest or of uniform motion in a straight line unless compelled to change that state by an applied force. This law is also known as the Law of Inertia.
What is inertia? How is it related to mass?
Answer
Inertia is the natural tendency of an object to resist a change in its state of motion or rest. The mass of an object is a measure of its inertia. Heavier objects have more inertia and require greater…
Why do passengers in a moving bus fall forward when the bus suddenly stops?
Answer
When the bus stops suddenly, the bus and the passenger's feet in contact with the floor come to rest due to brakes. However, the upper part of the passenger's body continues to move forward due to ine…
What is momentum? Write its formula and SI unit.
Answer
Momentum is the product of an object's mass and velocity. Formula: p = mv, where p = momentum, m = mass, v = velocity. SI unit: kg⋅m⋅s⁻¹. Momentum has both magnitude and direction (same as velocity).
State Newton's Second Law of Motion.
Answer
The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force. Mathematically: F = ma, where F = force, m = mass, a = acceleration.
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