Ram is pushing a block on an inclined plane against gravity. Name the force which is felt
by him while doing so. Also state whether it is a contact or a non-contact force.
Answers
Answer:
The first chapter of this book dealt with the topic of kinematics — the mathematical description of motion. With the exception of falling bodies and projectiles (which involve some mysterious thing called gravity) the factors affecting this motion were never discussed. It is now time to expand our studies to include the quantities that affect motion — mass and force. The mathematical description of motion that includes these quantities is called dynamics.
Many introductory textbooks often define a force as "a push or a pull". This is a reasonable informal definition to help you conceptualize a force, but it is a terrible operational definition. What is "a push or a pull"? How would you measure such a thing? Most importantly, how does "a push or a pull" relate to the other quantities already defined in this book?
Physics, like mathematics, is axiomatic. Each new topic begins with elemental concepts, called axioms, that are so simple that they cannot be made any simpler or are so generally well understood that an explanation would not help people to understand them any better. The two quantities that play this role in kinematics are distance and time. No real attempt was made to define either of these quantities formally in this book (so far) and none was needed. Nearly everyone on the planet knows what distance and time mean.
examples
How about we build up the concept of force with real world examples? Here we go…
Forces that act on all objects.
Weight (W, Fg)
The force of gravity acting on an object due to its mass. An object's weight is directed down, toward the center of the gravitating body; like the Earth or moon, for example.
Forces associated with solids.
Normal (N, Fn)
The force between two solids in contact that prevents them from occupying the same space. The normal force is directed perpendicular to the surface. A "normal" in mathematics is a line perpendicular to a planar curve or surface; thus the name "normal force".
Friction (f, Ff)
The force between solids in contact that resists their sliding across one another. Friction is directed opposite the direction of relative motion or the intended direction of motion of either of the surfaces.
Tension (T, Ft)
The force exerted by an object being pulled upon from opposite ends like a string, rope, cable, chain, etc. Tension is directed along the axis of the object. (Although normally associated with solids, liquids and gases can also be said exert tension in some circumstances.)
Elasticity (Fe, Fs)
The force exerted by an object under deformation (typically tension or compression) that will return to its original shape when released like a spring or rubber band. Elasticity, like tension, is directed along an axis (although there are exceptions to this rule).
Forces associated with fluids. Fluids include liquids (like water) and gases (like air).
Buoyancy (B, Fb)
The force exerted on an object immersed in a fluid. Buoyancy is usually directed up (although there are exceptions to this rule).
Drag (R, D, Fd)
The force that resists the motion of an object through a fluid. Drag is directed opposite the direction of motion of the object relative to the fluid.
Lift (L, Fℓ)
The force that a moving fluid exerts as it flows around an object; typically a wing or wing-like structure, but also golf balls and baseballs. Lift is generally directed perpendicular to the direction of fluid flow (although there are exceptions to this rule).
Thrust (T, Ft)
The force that a fluid exerts when expelled by a propeller, turbine, rocket, squid, clam, etc. Thrust is directed opposite the direction the fluid is expelled.
Forces associated with physical phenomena.
Electrostatic Force (FE)
The attraction o"
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Explanation:
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