Physics ยท Science General

Newtonian Mechanics and Forces

1,559 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

Which of the following statements about force is false?

  1. At least two objects must interact for a force to take place.

  2. Force has only magnitude.

  3. Forces applied on an object in the same direction add to one another.

  4. More than one force may act on an object.

  5. If two forces act in opposite directions on an object, the net force, acting on it, is the difference between the two forces.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The statement is false.

Multiple choice

Which of the following is an example of contact force?

  1. Like poles of magnets repelling each other

  2. Straw rubbed with paper attracting another straw, which is not rubbed with paper

  3. Pressing a lump of dough to make chapatti balls

  4. Water flowing down from a tap

  5. Electromagnets being used to pick up metallic scrap
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pressing a lump of dough to make chapatti balls is due to muscular force (contact force).

Multiple choice

Force acting per unit area of a surface is called

  1. friction

  2. gravity

  3. volume

  4. magnetism

  5. pressure
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Pressure is defined as force acting per unit area. Its S.I unit is Pascal (or newton per square metre). Thus, it is the correct option.

Multiple choice

A boy was travelling for the first time in an aeroplane. As the flight took off from the airport, he got an uneasy feeling. He felt that some pressure changes had occurred. What forces were acting on the aeroplane immediately after it took off?

  1. Magnetism and muscular force

  2. Electrostatic force and magnetism

  3. Friction of fuel and muscular force

  4. Gravity and friction of air

  5. Magnetism and mechanical force
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gravity and friction of air were acting on the aeroplane immediately after it took off.

Multiple choice

Which of the following is an example for muscular force?

  1. Blacksmith hammering a hot piece of iron

  2. Magnet attracting an iron piece

  3. An apple falling from a tree

  4. A rolling ball coming to rest

  5. An aircraft taking off
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blacksmith uses his muscular force to hammer a hot piece of iron.

Multiple choice

Which of the following relationship is true?

  1. Effort * distance moved by effort = Load * distance moved by load.

  2. Effort * distance moved by effort > Load * distance moved by load

  3. Effort * distance moved by effort < Load * distance moved by load

  4. Effort / distance moved by effort = Load * distance moved by load

  5. Effort * distance moved by effort = Load / distance moved by load
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the right equation.

Multiple choice

Which of the following statement is false about a pulley?

  1. Force is applied towards gravity

  2. Direction of force can be changed

  3. It is neither a speed multiplier nor a force multiplier

  4. Wheel is fixed over the axle

  5. It is used to lift heavy objects
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is wrong because wheel is not fixed but rotates freely over the axle.

Multiple choice

Why is it easy to draw water from a well when the rope passes over a pulley, rather then drawing it directly?

  1. Pulley adds more water

  2. Pulley decreases the weight of the bucket

  3. Pulley has a mechanical advantage of more than one

  4. Pulley changes the direction of force

  5. Pulley increases the effort
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, pulley changes the direction of the pull on the rope from upwards against gravity to downwards towards gravity. This makes easier to lift heavy bucket. No, pulley does not increases the effort but it decreases it.

Multiple choice

Which of the following is not a negative effect of friction?

  1. A child is able to write with a pencil.

  2. Worn out soles in an old shoe

  3. Wearing out of tyres of vehicles

  4. Ball bearing in a machine wearing out

  5. Machine working for a long time producing too much heat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Writing with a pencil or pen will not be possible without friction.