Force and Pressure — Flashcards
ICSE · Class 8 · Physics
42 flashcards for Force and Pressure (ICSE Class 8 Physics) 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 that can change the state of rest or motion of a body, or change its size or shape.
What does a force do to a rigid body?
Answer
A force applied to a rigid body can change only its motion. A rigid body keeps the spacing between its particles unchanged.
What does a force do to a non-rigid body?
Answer
A force applied to a non-rigid body can change its motion as well as its size or shape, such as stretching or squeezing.
State the SI unit of force.
Answer
The SI unit of force is newton, symbol N. One newton is the force that when applied on a moving body of mass 1 kg in the direction of its motion, increases its speed by 1 m in one second.
How are force and mass different?
Answer
Force does not change the mass of a body. Force can change motion or shape, but mass remains the same.
A force of 8 N acts on a body for 3 m. Find the moment of force.
Answer
Given: F = 8 N, OP = 3 m Formula: Moment of force = Force × perpendicular distance Calculation: 8 N × 3 m = 24 N m Answer: 24 N m…
A force of 12 N acts at a perpendicular distance of 0.5 m from a pivot. Find the moment of force.
Answer
Given: F = 12 N, OP = 0.5 m Formula: Moment of force = F × OP Calculation: 12 N × 0.5 m = 6 N m Answer: 6 N m…
Reena applies a minimum force of 1.5 N on a door handle of width 1.2 m. Find the moment of force.
Answer
Given: F = 1.5 N, OP = 1.2 m Formula: Moment of force = Force × perpendicular distance Calculation: 1.5 N × 1.2 m = 1.8 N m Answer: 1.8 N m…
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