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04. Force

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Answer in one line

Prepared by: learnloophq@gmail.com
Last edited 26 days ago by Learn LoopHQ.

Chapter: 04. Force

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Answer in one line

What is force commonly defined as in everyday life actions?
Force is commonly defined as a push or a pull that acts on an object.
Give one example of force as a push.
Kicking a ball is an example of applying force as a push.
Give one example of force as a pull.
Pulling a suitcase towards yourself is an example of applying force as a pull.
Can we see force?
No, we cannot see force directly, but we can observe its effects.
How does force affect the shape of an object?
Force can change the shape and size of an object, such as when you press a balloon.
Name two things that exert force naturally.
Strong winds and storms are natural things that exert force.
List the three types of non-contact forces.
The three types of non-contact forces are gravitational force, magnetic force, and electrostatic force.
What is the main characteristic of a contact force?
A contact force is applied to an object by another object that is in direct physical contact with it.
Why does a rolling ball eventually come to rest on the ground?
A rolling ball eventually comes to rest on the ground due to the force of friction acting between the ball and the ground, which opposes its motion.
What is the relationship between the roughness of surfaces and the force of friction?
The force of friction is larger between two rough surfaces and smaller between two smooth surfaces.
Give an example of static friction from daily life.
When you try to push a heavy table but it doesn’t move, static friction is in play, preventing its motion.
What type of friction is experienced when a flat block is moved over a flat surface?
Sliding friction is experienced when a flat block is moved over a flat surface.
Why are vehicles fitted with wheels instead of flat blocks for movement?
Vehicles are fitted with wheels because rolling friction is much less than sliding friction, making it easier to move objects with wheels.
How does friction help us to walk?
Friction between the ground and our feet or footwear allows us to walk by providing the necessary grip to push against the ground.
State one major disadvantage of friction in machinery.
One major disadvantage of friction in machinery is that it causes wear and tear in parts and produces heat, reducing efficiency.
Why do forest fires sometimes occur naturally during hot summer months?
Forest fires can occur naturally because friction between dry branches rubbing against each other can generate enough heat to cause them to catch fire.
Who formulated the universal law of gravitation?
Sir Isaac Newton formulated the universal law of gravitation.
Why do buses and trucks have heavier and wider tires than cars?
Buses and trucks have heavier and wider tires to distribute their heavy loads over a larger area, providing better grip, stability, and reducing wear.
What makes it difficult to drive on wet roads during rains?
It is difficult to drive on wet roads during rains because water acts as a lubricant, significantly reducing the friction between the tires and the road surface.
Why do Kabaddi players rub their hands with soil before a game?
Kabaddi players rub their hands with soil to increase the friction and roughness of their hands, which provides a better and firmer grip on their opponents.
How does moisture on the ground affect the force of friction between a cricket ball and the ground?
If the moisture is more, the friction between the ball and the ground decreases, making it difficult to spin the ball.
What significant invention, besides his laws of motion, is attributed to Sir Isaac Newton?
Sir Isaac Newton is also credited with inventing the mirror telescope.
Describe the experimental setup used to demonstrate that rolling friction is less than sliding friction.
The experiment involves comparing the force needed to pull a wooden block across a table (sliding) versus pulling it with cylindrical rods or pencils placed underneath (rolling), observing that less force is required in the latter case.
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