Podcast
Questions and Answers
What is the SI unit of force?
What is the SI unit of force?
- Newton (correct)
- Kilogram
- Dyne
- Pound
Which of the following best describes balanced forces?
Which of the following best describes balanced forces?
- They never act on an object simultaneously.
- They can change the shape and size of a body. (correct)
- They always change an object's speed.
- They result in a net force that is greater than zero.
Which situation involves an unbalanced force?
Which situation involves an unbalanced force?
- A car moving at a constant speed.
- Two people exerting equal forces in opposite directions.
- A child pushing a swing with varying strength. (correct)
- A stack of books on a table.
What is meant by the term 'resultant force'?
What is meant by the term 'resultant force'?
Which of the following actions can be classified as a pulling action?
Which of the following actions can be classified as a pulling action?
What effect can a push or pull have on a moving object?
What effect can a push or pull have on a moving object?
What happens when the resultant of all forces acting on a body is zero?
What happens when the resultant of all forces acting on a body is zero?
Which of the following is a characteristic of contact forces?
Which of the following is a characteristic of contact forces?
Which of the following is NOT a type of action categorized under force?
Which of the following is NOT a type of action categorized under force?
What indicates that two bodies are interacting to produce force?
What indicates that two bodies are interacting to produce force?
What is an example of muscular force?
What is an example of muscular force?
What does frictional force do?
What does frictional force do?
What is the relationship between kilogram force (kgf) and gram force (gf)?
What is the relationship between kilogram force (kgf) and gram force (gf)?
What type of force is exerted by a magnet?
What type of force is exerted by a magnet?
Which of the following is a vector quantity?
Which of the following is a vector quantity?
What distinguishes non-contact forces from contact forces?
What distinguishes non-contact forces from contact forces?
Which of the following is NOT a function of muscular force?
Which of the following is NOT a function of muscular force?
What is the resultant force when two boys pull a rope with 200 N each towards opposite directions?
What is the resultant force when two boys pull a rope with 200 N each towards opposite directions?
If two persons push a heavy box with forces of 200 N and 150 N in the same direction, what is their resultant force?
If two persons push a heavy box with forces of 200 N and 150 N in the same direction, what is their resultant force?
What is the result of a ball moving across a surface slowing down?
What is the result of a ball moving across a surface slowing down?
Which effect of force is demonstrated when a ball at rest starts moving after being kicked?
Which effect of force is demonstrated when a ball at rest starts moving after being kicked?
What happens to a moving bicycle when a force is applied from behind?
What happens to a moving bicycle when a force is applied from behind?
When two persons push a heavy box from opposite directions with forces of 400 N and 220 N, what is the resultant force?
When two persons push a heavy box from opposite directions with forces of 400 N and 220 N, what is the resultant force?
What other unit is equivalent to the force used to lift a mass of 1 kg?
What other unit is equivalent to the force used to lift a mass of 1 kg?
What role do wooden sleepers play in supporting railway lines?
What role do wooden sleepers play in supporting railway lines?
How is the pressure exerted by a liquid calculated?
How is the pressure exerted by a liquid calculated?
What device is commonly used to measure pressure differences in a liquid?
What device is commonly used to measure pressure differences in a liquid?
What phenomenon is responsible for air pressure?
What phenomenon is responsible for air pressure?
What is the weight of the atmosphere above the surface of the Earth?
What is the weight of the atmosphere above the surface of the Earth?
Which device is specifically used for measuring air pressure?
Which device is specifically used for measuring air pressure?
What does the difference in heights 'h' in a manometer indicate?
What does the difference in heights 'h' in a manometer indicate?
What effect does atmospheric pressure have on objects on Earth?
What effect does atmospheric pressure have on objects on Earth?
What determines whether the magnetic force between two magnets is attractive or repulsive?
What determines whether the magnetic force between two magnets is attractive or repulsive?
Which of the following accurately describes gravitational force?
Which of the following accurately describes gravitational force?
Which statement about pressure is correct?
Which statement about pressure is correct?
Why are broader tires used on the rear wheels of tractors?
Why are broader tires used on the rear wheels of tractors?
How does a sharp knife cut more effectively than a blunt knife?
How does a sharp knife cut more effectively than a blunt knife?
Which force is exerted by electrically charged objects on uncharged objects?
Which force is exerted by electrically charged objects on uncharged objects?
What property makes tools like needles effective for piercing?
What property makes tools like needles effective for piercing?
Which of the following forces can act over a distance without contact?
Which of the following forces can act over a distance without contact?
Flashcards
Force
Force
A push or pull that can change the motion of an object. It has both magnitude and direction.
Kilogram Force (kgf)
Kilogram Force (kgf)
A unit of force equal to the force required to lift a 1 kg mass vertically.
Gram Force (gf)
Gram Force (gf)
A unit of force equal to the force required to lift a 1 g mass vertically.
Adding Forces: Same Direction
Adding Forces: Same Direction
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Adding Forces: Opposite Directions
Adding Forces: Opposite Directions
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Force: Moves a Stationary Object
Force: Moves a Stationary Object
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Force: Stops a Moving Object
Force: Stops a Moving Object
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Force: Changes Speed of Moving Object
Force: Changes Speed of Moving Object
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Contact Force
Contact Force
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Muscular Force
Muscular Force
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Frictional Force
Frictional Force
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Non-Contact Force
Non-Contact Force
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Magnetic Force
Magnetic Force
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Gravitational Force
Gravitational Force
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Resistance
Resistance
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What is Force?
What is Force?
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Interaction Causes Force
Interaction Causes Force
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Resultant Force
Resultant Force
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Balanced Forces
Balanced Forces
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Unbalanced Forces
Unbalanced Forces
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Newton (N)
Newton (N)
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Magnitude of Force
Magnitude of Force
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Dyne
Dyne
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Electrostatic Force
Electrostatic Force
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Pressure
Pressure
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Tractor Tires
Tractor Tires
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Sharp Edges
Sharp Edges
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Backpack Straps
Backpack Straps
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Force and Area
Force and Area
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Pressure Exerted by Liquids
Pressure Exerted by Liquids
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Manometer
Manometer
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Pressure Exerted by Gases
Pressure Exerted by Gases
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Atmospheric Pressure
Atmospheric Pressure
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What do wooden sleepers do?
What do wooden sleepers do?
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How is pressure measured?
How is pressure measured?
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Why are railway lines supported?
Why are railway lines supported?
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Study Notes
Force and Interactions
- Force is a vector quantity, meaning it has both magnitude and direction
- Force arises from interactions between two bodies
- Without interaction, no force exists
- Forces can change the state of motion of a body (speed, direction, or shape)
- The direction of a force is the direction in which the body is pushed or pulled
Types of Forces
- Contact forces: Forces that involve physical contact between objects
- Examples include muscular force and frictional force
- Non-contact forces: Forces that act without physical contact
- Examples include magnetic force, electrostatic force, and gravitational force
Effects of Force
- Force can:
- Move a stationary object
- Stop a moving object
- Change the speed of a moving object
- Change the shape and size of an object
Units of Force
- SI unit of force is the newton (N)
- CGS unit of force is the dyne
Resultant Force
- When multiple forces act on a body, the resultant force is the single force that produces the same effect on the body as all the forces combined
- Balanced forces have a resultant force of zero
- Unbalanced forces have a resultant force greater than zero
Pressure
- pressure is the perpendicular force acting on a unit area of an object.
- Pressure (P) = Force (F) / Area (A)
Pressure in Fluids
- Liquids and gases exert pressure which increases with depth
- The pressure exerted by a liquid is the same at a given depth, in all directions at that same depth
- The pressure exerted by liquids is proportional to the height of the column of liquid and its density.
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