Physics Force and Interactions Quiz

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Questions and Answers

What is the SI unit of force?

Newton (correct)

Kilogram

Dyne

Pound

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?

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'?

The single force from multiple forces acting on an object. Signup and view all the answers

Which of the following actions can be classified as a pulling action?

Flying a kite Signup and view all the answers

What effect can a push or pull have on a moving object?

It can change the direction of motion. Signup and view all the answers

What happens when the resultant of all forces acting on a body is zero?

The object remains at rest or continues in uniform motion. Signup and view all the answers

Which of the following is a characteristic of contact forces?

They require physical contact between bodies. Signup and view all the answers

Which of the following is NOT a type of action categorized under force?

Cycling Signup and view all the answers

What indicates that two bodies are interacting to produce force?

At least two bodies must be involved. Signup and view all the answers

What is an example of muscular force?

A person lifting a box. Signup and view all the answers

What does frictional force do?

It opposes the motion of one body over another. Signup and view all the answers

What is the relationship between kilogram force (kgf) and gram force (gf)?

1 kgf equals 1000 gf. Signup and view all the answers

What type of force is exerted by a magnet?

Magnetic force. Signup and view all the answers

Which of the following is a vector quantity?

Force Signup and view all the answers

What distinguishes non-contact forces from contact forces?

Non-contact forces can act without physical contact. Signup and view all the answers

Which of the following is NOT a function of muscular force?

A magnet attracting a metal. Signup and view all the answers

What is the resultant force when two boys pull a rope with 200 N each towards opposite directions?

0 N Signup and view all the answers

If two persons push a heavy box with forces of 200 N and 150 N in the same direction, what is their resultant force?

350 N Signup and view all the answers

What is the result of a ball moving across a surface slowing down?

Frictional force acting against its motion. Signup and view all the answers

Which effect of force is demonstrated when a ball at rest starts moving after being kicked?

Moves a stationary object. Signup and view all the answers

What happens to a moving bicycle when a force is applied from behind?

Its speed increases. Signup and view all the answers

When two persons push a heavy box from opposite directions with forces of 400 N and 220 N, what is the resultant force?

180 N Signup and view all the answers

What other unit is equivalent to the force used to lift a mass of 1 kg?

1000 gf Signup and view all the answers

What role do wooden sleepers play in supporting railway lines?

They distribute pressure over a larger area. Signup and view all the answers

How is the pressure exerted by a liquid calculated?

Pressure = Force/Area Signup and view all the answers

What device is commonly used to measure pressure differences in a liquid?

Manometer Signup and view all the answers

What phenomenon is responsible for air pressure?

Fast-moving molecules colliding with walls of their container. Signup and view all the answers

What is the weight of the atmosphere above the surface of the Earth?

Approximately 4.5 x 10^18 kg Signup and view all the answers

Which device is specifically used for measuring air pressure?

Barometer Signup and view all the answers

What does the difference in heights 'h' in a manometer indicate?

The pressure applied. Signup and view all the answers

What effect does atmospheric pressure have on objects on Earth?

It exerts pressure from all sides. Signup and view all the answers

What determines whether the magnetic force between two magnets is attractive or repulsive?

The poles facing each other Signup and view all the answers

Which of the following accurately describes gravitational force?

It acts on objects regardless of their location Signup and view all the answers

Which statement about pressure is correct?

Pressure increases with a decrease in area Signup and view all the answers

Why are broader tires used on the rear wheels of tractors?

To minimize pressure on the soil Signup and view all the answers

How does a sharp knife cut more effectively than a blunt knife?

It exerts greater pressure on a smaller area Signup and view all the answers

Which force is exerted by electrically charged objects on uncharged objects?

Electrostatic force Signup and view all the answers

What property makes tools like needles effective for piercing?

Their sharp edges that reduce contact area Signup and view all the answers

Which of the following forces can act over a distance without contact?

Gravitational force Signup and view all the answers

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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Description

Test your knowledge on the concepts of force and interactions! This quiz covers types of forces, their effects, and the units used to measure force. Dive deeper into understanding both contact and non-contact forces.