Tag: physics

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Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

It is advised to tie any luggage kept on the roof of a bus with a rope because of :

  1. Newtons first law

  2. Newtons second law

  3. Newtons third law

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

Luggage kept on the roof of a bus has the tendency to maintain its state of rest when bus is in rest and to maintain the state of motion when bus is in motion according to Newtons First Law of Motion. When bus will come in motion from its state of rest, in order to maintain the position of rest, luggage kept over its roof may fall down(backward). Similarly, when a moving bus will come in the state of rest or there is any sudden change in velocity because of applying of brake, luggage may fall down(forward) because of its tendency to remain in the state of motion.
This is the cause that it is advised to tie any luggage kept on the roof a bus with a rope so that luggage can be prevented from falling down.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

A horse tied to a cart is standing stationary on road. Which of the following statement is CORRECT?

  1. Horse is applying force on the cart

  2. Cart is applying force on the horse

  3. Force applied by the horse is balanced by the force applied by the cart

  4. No forward force is being applied by the horse or the cart
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The horse tied to cart is standing stationary on road denotes that the net force acting on the horse as well as the cart individually is zero. If it is standing stationary, it means that horse is applying force on the road perpendicularly and road is also applying same magnitude of force in the opposite direction, which makes the net force on horse to be zero and hence no forward force on the horse is there.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

Which law of Newton defines an ‘inertial frame of reference’?

  1. First law of motion

  2. Second law of motion

  3. Third law of motion

  4. Law of gravitation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

First Law of Newton states that when viewed in an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity unless acted upon by an external force.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

A particle is moving with a constant speed along a straight line path. A force is not required to:

  1. Increase its speed

  2. Decrease its momentum

  3. Change the direction

  4. Keep it moving with uniform velocity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Newton's first law of motion states that if an object experiences no net force, then its velocity is constant. So, force is not required to keep object moving with uniform velocity.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

Newton's first law of motion is also called Galileo's law of:

  1. Conservation of momentum

  2. Inertia

  3. Friction

  4. Conservation of mass
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Newton's first law of motion states that the object tends to remain in the initial state untill no external force is applied to it which is also called Galileo's law of inertia.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

When a body is stationary :

  1. there is no force acting on it

  2. the combination of forces acting on it balance each other

  3. the force acting on it are not in contact with it

  4. the body is in vacuum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For the body to be stationary, net external force acting on it must be equal to zero which is possible only when the combination of forces acting on it balance each other.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

Which law is involved in the act of cleaning a carpet by beating it with a stick ? 

  1. First law of motion.

  2. Second law of motion

  3. Law of conservation of energy

  4. Law of conservation of mass
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The dust particles get separated out from the carpet by beating it with a stick due to their inertia of rest which is explained by Newton's first law of motion.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

Idea of inertia came from:

  1. Newton's third law of motion

  2. Newton's second law of motion

  3. Newton's first law of motion

  4. Law of gravitation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Newton's first law of motion states that the body tends to remain in the initial state if no external force is applied to it which gave the idea of inertia.