Force and Motion — Flashcards
NIOS · Class 10 · Science & Tech
36 flashcards for Force and Motion (NIOS Class 10 Science & Tech) to test yourself on key terms and facts. Sample: "What is force?"
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What is force?
Answer
Force is a push or pull acting on an object. It can make an object move from rest, change its speed, change its direction, or change its shape.
Why does a balloon change shape when pressed?
Answer
A force applied by the hands can change the shape of an object. The balloon changes shape because the force compresses it from both sides.
A force of 15 N acts on a 3 kg object. What is the acceleration?
Answer
Use F = m a. So, a = F / m = 15 N / 3 kg = 5 m/s².
A 5 kg body moves with a velocity of 10 m/s. What is its momentum?
Answer
Momentum is p = m v. So, p = 5 kg × 10 m/s = 50 kg m s⁻¹.
Why does a loaded truck have more momentum than an empty truck moving with the same velocity?
Answer
Momentum depends on mass and velocity. For the same velocity, the truck with greater mass has greater momentum.
State Newton’s first law of motion.
Answer
Every body continues in its state of rest or of uniform motion in a straight line until unless it is compelled by some unbalanced force to change that state.
Why do passengers fall backward when a stationary bus starts suddenly?
Answer
The feet move with the bus, but the upper part of the body tries to remain at rest due to inertia. This causes a backward fall.
What is inertia?
Answer
Inertia is the tendency of objects to stay at rest or to keep moving with the same velocity.
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