Question

ning elfen
be pivote
the hedytun
Sondo. Force and Pressure
POST YOURSELF
jective lans-
(b) Moment of force =
* distance of
te trees or Antse for each statement :
force from the point of turning
From
(e) lu a door, handle is provided
(a) The SL unit of force is kgf.
tb) A force always produces both the linear and
the hinges.
furong motions
(d) The unit of thrust is.
c) Monsent of force = force * perpendicular
(e) Thrust is the force acting on a surface.
distance of force from the pivoted point.
0. Pressure is the thrust acting on a surface of
yd Less force is needed when applied at a
di area.
farther distance from the pivoted point,
(g) Thic unit of pressure is.
re) For á given thrust, pressure is more on a
(h) Pressure is reduced if
increases.
surface of large area.
(1) Pressure in a liquid . with the depth.
ID The pressure on a surface increases with an 0) The atmospheric pressure on earth surface is
increase in the thrust on the surface.
nearly
(g) A man exerts same pressure on the ground
Ans: (a) 10 (b) force (c) farthest (d) newton
whether he is standing or he is lying,
(e) normal (1) unit (g) pascal (h) area of
(h) tu is easier to hammer a blunt nail into a
surface (i) increases (i) 10% På
piece of wood than a sharply pointed nail. 3. Match the following:
a The 's. I unit of pressure is pascul.
Colonın
0) Water in a lake exerts pressure only at its (a) Camel
(1) broad and deep
hofton.
foundation
(o). A liquid exerts pressure in all directions.
(b) Truck
(ii) broad feet
(1) Gases exeri pressure in all directions.
(c) Knife
(ii) six or eight tyres
{m} . The atmospheric pressure is nearly 105 Pa, (d) High building (iv) sharp cutting edge
(5) Higher we go greater is the air pressure.
(e) Thrust
(v) atm
AL: Truec) (d), (D). (i). k), (i), (m)
(1) Moment of force (vt) N
False-(a), (b), (e), (g), (h), (j), (n)
(g). Atmospheric (vii) Nm
pressure
2. Fill in the blanks :
Anse: (a)-(w). (b)-(113). (c)-iv), (d)-(), (e)-vi),
taj lkgf = ....... N (nearly)
(-i); (g)-(0
the surface
creasings
called
but also​

Answer 1

Answer:

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The above figure(in attachment) shows a situation just before a collision. A lorry of mass 20,000 kg is travelling at 20 m/s towards a car of mass 900 kg travelling at 30 m/s towards the

lorry.

i) What is the momentum of the lorry before collision?

ii) What is the momentum of the car before collision?

iii) What is the total momentum after the collision?

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