A) DEFINE:
1) Force
2) contact force
3) force at distance
4) Field of force
5) Newton's first law of motion
6) inertia
7) inertia of rest
8) inertia of motion
9) Newton's second law of motion
10) Dyne
11) Newton
12) Gram force(gf)
13) kilogram force(kgf)
14) Newton third law of motion
B) QUESTIONS:
1) State four effects, Which a force can bring about, giving two examples in each case.
2) by giving two examples, state what do you understand by the term contact force.
3) by giving two examples, state what do you understand by the term force at distance.
4) Give two examples of each of the following:
a) Force which pulls.
b) Force which pushes.
c) Force which attracts.
d) Force which compresses.
e) Force which streched.
f) Force which deforms a body.
5) Classify the following forces into contact forces and forces at distance.
a) Frictional force.
b) Hydraulic force
c) Gravitational force.
d) Mechanical force.
e) electrostatic force.
f) Magnetic force.
6) Name two effects of force applied to non rigid body. Support your answer by an example.
7) Name two effects of force applied to non rigid body. Support your answer by an example.
8) Name two effects of force applied to a rigid body. Support your answer by an example.
9) a)What do you understand by the term inertia ?
b) What determines the inertia of a body ?
c) Define two kinds of inertia. Support your answer with one example each.
10) a) What do you understand by the term Momentum ?
b) State two factors which determine momentum of a body?
11) State Newton's second law of motion.
12) Show that rate of change of momentum is the product of mass and acceleration.
13) Name and define absolute units of force in
a) CGS system
b) S. I system.
14) Name and define gravitational unit of force in
a) CGS system
b) SI system
15) Prove 1 N= 10⁵ dynes.
16) state Newton's third law of motion.
17) Two bodies p and q are of the same mass, but are moving with a velocities of v and 5 v respectively. Compare their
a) inertia
b) moment.
18) Two bodies A and B are of mass m and 5 m and their velocities are 5v and v respectively. Assuming bodies are moving with uniform velocities, compare their
a) inertia
b) Momentum
c) force required to stop them.
C) SELECT THE CORRECT ANSWER FROM THE FOLLOWING :
1) The unit of momentum is :
a) kg m/s² b) Ns
c) kg m²/S². d) kg² m/s
2) the correct relation between force (F) mass(m) and acceleration (a) is
a) F= a/m b) F=ma²
c) F=ma d) F x a = m
3) Relation between newton and dyne is:
a) 10⁷ dynes = 1N
b) 1/10⁵ dynes = 1 N
c) 10⁵ dynes = 1 N
d) 10³ dynes = 1 N.
4) Relation between kilogram force and newton is
A) 1 kgf= 1 N b) 9.8 kgf= 1 N
C) 1 kgf= 980 N d) 1 kgf= 9.8 N
5) One Newton is a force which produces.
a) An acceleration of 1 cm/s² in a body of mass 1 g.
b) An acceleration of 1 m/s² in a the of mass 1 g.
c) an acceleration of 1 m/s² in a body of mass 1 kg.
d) An acceleration of 1 cm/s² in a body of mass 1 kg.
6) Based on Newton's third law, which statement is true?
a) The action and reaction act on the same body in same direction.
b) The action and reaction act on the same body But in opposite direction.
c) The action and reaction act on different bodies in opposite directions.
d) The action and reaction act on different bodies in same direction.
10) EXPLAIN THE FOLLOWING:
a) Why do we jerk wet clothes before spreading them on line?
b) Why does dust fly off when carpet is hit with stick ?
c) Why do the fruits fall off the branches of a tree in a strong wind?
d) Why does it pillion rider falls forward, when a driver of a two seater vehicle suddenly applies brakes ?
e) why do the doors of a corridor train open or shut, when the train starts and stops?
f) Why is it necessary to run along with the moving bus and in the same direction of bus, while alighting from it?
g) Why does a player run for some distance, before taking a long jump ?
h) why does a person fall off the back of a stationary horse, if the horse darts off suddenly?
i) Why a hole is formed in the glass pane, If a bullet is fired on it from a close range ?
j) Why a boatman pushes the bank backward with a long bamboo pole, on the lunching his boat in water?
k) Why does a boat tend to leave the shore, when the passengers are alighting from it ? how does boatmen overcomes above difficulty ?
l) Why are wet surfaces more slippery?
m) why does the gun recoil back, when the fired ?
n) how do the Rockets operate in space ?
o) why is it difficult to wolk on mercy ground?
p) why did air filled balloon rise up slightly when punctured from below ?
q) Why does a swimmer push water backward with his hands, in order to swim in forward direction?
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