A. Short answer type questions.
1. Answer the following questions.
a. What do you mean by force?
b. State the effects of force on a body.
c. What are the two types of forces?
d. What is gravitational force?
e. Give three examples for non-contact forces.
f. How do you calculate the resultant of two forces acting on a body...
i. in the same direction
ii. in the opposite direction
g.What is pressure?
h. What is friction?
Answers
Answer:
a.In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate. Force can also be described intuitively as a push or a pull.
b.A force acting on an object causes the object to change its shape or size, to start moving, to stop moving, to accelerate or decelerate. When there's the interaction between two objects they exert a force on each other, these exerted forces are equal in size but opposite in direction.
c.
Two groups of forces
Gravity force.
Magnetic force.
Electric force.
d.Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
e.Examples of this force include: electricity, magnetism, radio waves, microwaves, infrared, visible light, X-rays and gamma rays.
f.Generally, if →F1,→F2,→F3....are the forces acting on a body, their resultant force →Fis given by: →F=→F1+→F2+→F3.... Depending on the number forces acting, the resultantcan be obtained geometrically by applying triangle law, parallelogram law or polygon law of vector addition.
g.Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid. ... In SI units, pressure is measured in pascals; one pascal equals one newton per square metre. Atmospheric pressure is close to 100,000 pascals.
h.Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.
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Answer:
a.Force can be described intuitively as a push or pull.
b.A force acting on an object causes the object to change its shape or size,to start moving.
c.1.Gravite force,2.Electric force.
d.Gravity,or gravitation,is a natural phenomenon by which all things with mass or energy – including plants,stars,glaxies and even light are brought towards one another.
e.An apple falling down from a tree.
f.The direction of the resultant force is in the same direction.
g.Pressure is the force applied perpendicularly to the surface of an object per unit.
h.Friction is the force.
f.The direction of the re