1 Crore+ students have signed up on EduRev. Have you? Download the App 
When a horse pulls a cart, the force that helps the horse to move forward is the force exerted by:
Two masses are in the ratio 1:5. What is ratio of their inertia?
Force of inertia = ma
Let the masses be 1x and 5x
Force of inertia for 1st body= 1x * a
Force of inertia for 2nd = 5x * a
Ratio= x * a / 5x * a = 1:5
Additional Information: The inability of a body to change it’s state of rest or uniform motion is called inertia.
A 6 kg object is subject to three forces
F_{1} = 20i + 30j N
F_{2} = 8i  50j N
F_{3} = 2i + 2j N
Find the acceleration of object.
F = F1 + F2 + F3 = ( 20i + 30j) N+(8i  50j) N+(2i +2 j) N
=(20+8+2)i+(3050+2)j
F=30i  18j
F = ma
Substituting F and m = 6 kg (given) in the above equation we get,
30i  18j = 6*a
A = 5i  3j
Hence (b) is correct choice
If the net external force on the body is zero, its:
Newton's second law states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass. Mathematically, this can be expressed as F=ma, where F is the net force, m is the mass of the object, and a is the acceleration.
When the net external force acting on a body is zero (i.e., ΣF = 0), according to Newton's second law, the acceleration of the object is also zero. However, this does not mean that the object's speed, displacement, or velocity is zero. The object can still move at a constant velocity (i.e., with a constant speed in a straight line), or it can be at rest, i.e., with zero velocity.
Therefore, the correct answer is B: Acceleration is zero.
Which law governs the phenomenon that a tablecloth is pulled out from under a setting of chinaware without damaging it?
According to Newton’s First Law, the cloth is set in motion but the chinaware continues to remain in its state of rest; hence it is not damaged.
Additional Information: Newton's first law of motion is often stated as: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Hence, option A is correct.
It is usually seen that during rainy days we tend to slip because rainwater acts as a lubricant between our feet and the ground.
This lubrication (rainwater) converts dry friction into fluid friction.
That is, the friction between feet and ground reduces, making us slip.
Therefore, due to less friction, we slip on a rainy day.
Passengers in a bus lean forward as bus suddenly stops. This is due to
When the bus moves, the passenger's body comes into a state of motion but when the bus stops the lower part of the body which is in contact with the floor comes into a state of rest whereas the upper part of the body still remains in the state of motion and because of this the upper part of the body falls in the forward direction. This is due to the presence of inertia.
Hence the correct answer is C.
A particle of mass 'm' original at rest, is subjected to a force whose direction is constant but whose magnitude varies with according to the relation
Where F_{0} and T are constant.
Then speed of the particle after a time 2T is:
Given:
Speed of the particle after a time 2T,
Newton’s first law of inertia states that an object at rest or in motion tends to stay at rest or moving with constant motion unless enacted upon by an unbalanced force.
The law of inertia relates to the sport of cycling due to the fact that the cyclist is in constant motion when on the cycle.
The motion of the bike is caused by the rider pressing down upon the pedals, which, in turn, enables the rider to accelerate on the bike.
As well, the cyclist will continue to move unless enacted upon by an opposing unbalanced force, such as the force of friction on the bike tires, when the bike decelerates to a stop.
The Law of Inertia is also displayed when the cyclist begins to move on the bicycle from a stop.
The action is related to the concept of Inertia for the reason that the cyclist is applying an unbalanced force to the bicycle pedals when not in motion. As a result, the bicycle would gain acceleration and therefore begin to move.
Therefore the correct answer is B.
124 videos464 docs210 tests

124 videos464 docs210 tests
