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Common Forces In Mechanics - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main
Quick Facts
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Common forces in mechanics is considered one of the most asked concept.
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12 Questions around this concept.
Solve by difficulty
Two objects resting on a table. Mass of object 1 (m1) = 1 kg, mass of object 2 (m2) = 2 kg, Acceleration due to gravity (g) =9.8 m/s2. Determine the magnitude and direction of the normal force (R1) exerted by m2 on the m1 and the normal force (R2) exerted by the table on the m2.
A body of mass 1 kg lies on a smooth inclined plane. A force F=10m is applied horizontally on the block as shown. The magnitude of normal reaction by the inclined plane on the block is
A monkey of mass 50 kg climbs on a rope which can withstand the tension $(\mathrm{T})$ of 350 N . If monkey initially climbs down with an acceleration of $4 \mathrm{~m} / \mathrm{s}^2$ and then climbs up with an acceleration of $5 \mathrm{~m} / \mathrm{s}^2$. Choose the correct option $\left(\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2\right)$.
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A block of mass M lies on smooth inclined plane. A force of 15 N is applied horizontally on the block as shown. The magnitude of normal by inclined plane on the block is , if the block is in equilibrium condition
As shown in figure, a 70 kg garden roller is pushed with a force of $\tilde{\mathrm{F}}=200 \mathrm{~N}$ at an angle of $30^{\circ}$ with horizontal. The normal reaction on the roller is
(Given $\mathrm{g}=10 \mathrm{~ms}^{-2}$ )
Concepts Covered - 1
Common forces in mechanics
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Gravitational force (Weight):-
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Definition- Force with which earth attracts an object.
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It always acts towards the center of the earth
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It is denoted by W=mg, where m=mass of the body and g= acceleration due to gravity.
2. Normal Reaction(N ):-
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Definition- A contact force between two bodies in physical contact which acts perpendicular to common surface in contact.
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Normal reaction is always a push force
Examples of Normal reaction acting on a block kept on horizontal surface and inclined plane is shown in figures below-
Examples of Normal reaction acting on a rod resting between ground and wall is shown in figures below-
3. Tension(T):-
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Force exerted by taut string, rope or chain against pulling force along the length .
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It acts away from the point of contact.
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It is always a pull force
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Tension remains the same as long as the string is the same only in case of a massless string.
4. Spring Force:-
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Spring force is a type of restoring force which tries to come back to its natural length.
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f = -Kx
where k is the spring constant and its unit is N/m and x is net elongation or compression in the spring.
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Here -ve sign represents the restoring nature of the spring force.
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