Physics · Science General

Newtonian Mechanics and Forces

1,605 Questions

Newtonian mechanics studies the motion of objects and the physical laws governing them. This hub covers friction, gravitational force, inertia, and vector quantities. Mastering these fundamental physics concepts is essential for various government competitive exams.

Laws of motionFriction and inertiaVector and scalar quantitiesGravitational accelerationArchimedes principle

Newtonian Mechanics and Forces Questions

Multiple choice physics a little effort, lot of work levers and pulleys pulley pulleys

Wheel-and-axle and rope move in :

  1. Same direction

  2. Opposite direction

  3. Perpendicular direction

  4. There is no relation between the two
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a wheel-and-axle system, the rope wrapped around the axle moves in the same direction as the rotation of the wheel.

Multiple choice physics machines levers and pulleys pulley pulleys

A single fixed pulley is

  1. A machine that only changes the direction of the force applied, not the amount

  2. A machine that only changes the amount of force not direction

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A single fixed pulley is a machine that only changes the direction of the force applied, not the amount.
The wheel of a fixed pulley does not move because the wheel is attached to some support.

Multiple choice physics a little effort, lot of work levers and pulleys pulley pulleys

In the wheel and axle arrangement,wheel and axle and the rope move in:

  1. same direction

  2. opposite direction

  3. perpendicular direction

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a wheel-and-axle system, when the wheel rotates in one direction, the rope attached to the axle moves in the opposite direction relative to the pulling force required to wind it.

Multiple choice physics machines levers and pulleys pulley pulleys

In a pulley:

  1. Wheel is fixed over the axle

  2. Direction of force will not be changed

  3. Mechanical advantage will be more than one

  4. Wheel rotates freely over the axle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A pulley is designed with a wheel that rotates freely on its axle to allow a rope or cable to pass over it smoothly.

Multiple choice physics machines levers and pulleys pulley pulleys

Weight of the pulley ____ the mechanical advantage of single fixed pulley and ____ the mechanical advantage of single movable pulley 

  1. increases, increases

  2. increases, reduces

  3. doesn't affect, reduces

  4. reduces, does not affect
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Weight of pulley does not affect mechanical advantage of single fixed pulley.

Weight of pulley reduces mechanical advantage of single fixed pulley(because it is not stationary).

Multiple choice physics machines levers and pulleys pulley pulleys

In a fixed pulley 

  1. load and effort are equal

  2. load is greater than effort

  3. load is less than effort

  4. both have no relation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a single fixed pulley, the effort applied equals the load being lifted, as the mechanical advantage is 1.

Multiple choice physics energy : forms and sources concept of energy energy for everything forms of energy

A body at rest can have:

  1. speed

  2. energy

  3. momentum

  4. velocity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If a body is at rest then its position does not changes if position is not changing then $\frac{dx}{dt}=0$ so velocity is zero.

If Instantanious velocity is zero then speed is also zero this means if speed is zero then kinetic energy is also zero.
If v=0 then mv=0 i.e. momentum is also zero.
But a body raised upto some height against gravity and is at rest but it poses some potential energy which when released will be converted to kinetic energy.
So a body at rest can poses only potential energy from all these options.

Multiple choice physics work, energy and machines concept of energy energy for everything forms of energy

When a men walks on a horizontal surface  then work done by

  1. friciton is zero

  2. contact force is non-zero

  3. gravity is non-zero

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the man moves on a horizontal surface, then work done by gravity is zero since gravitational force acts perpendicular to the displacement. 


And the normal force will be also perpendicular to displacement so work done by It also is zero. - - - - - - - - 1

But frictional force is acting opposite to displacement so work done by frictional force is negative. - - - - - - - - - - - 2

Using statement (1) and (2) we can say that work done by contact force is non - zero 


Multiple choice biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

Movement of food, water, etc is known as

  1. Motion

  2. Transportation

  3. Translocation

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Phloem transports synthesized food from the leaves to the rest of the plant body. The transport of water, nutrients, and other substances from one part of a plant to another is called as translocation. The medium of transport in plants is water. 

So, the correct answer is option C.