LT ATUL KATARYA MEMORIAL SCHOOL

SUMMER HOLIDAY HOMEWORK ASSIGNMENT

SUBJECT: PHYSICS

CLASS: VI

Q.1 Fill in the blank spaces

  1. Force of ...... is caused only when the surfaces of two bodies in contact with each other ......
  2. Force of friction always acts in a direction, ...... to the direction of applied ______.
  3. The attractive force of a ...... pulls iron objects towards ......
  4. One kgf is equal to ...... newton.
  5. A scissors is a lever of ...... order.
  6. A nut-cracker is a lever of ...... order.
  7. A sugar tongs is a lever of ...... order.
  8. A machine can help us in doing ...... WORK.
  9. When the ...... is in the middle of load and fulcrum, it is a lever of third order.
  10. In case of lever of third order ,effort arm is always ...... than load arm.
  11. Force can change the direction of a ......

Q.2 Tick ( ✓ ) the most appropriate answer.

i. The gravitational force is a :

(a) contact force (b) consequential force

(c) force at distance (d) none of these

ii. The wheel barrow is an example of :

(a) lever of first order (b) lever of second order

(c) lever of third order (d) inclined plane

Iii. A lever which always uses more effort to lift a lighter load, is :

(a) lever of first order (b) lever of second order

(c) lever of third order (d) all the three orders of lever

iv. An axe is an example of :

(a) inclined plane (b) wedge

(c) lever(d) wheel and axle

v. The force applied by cricketer to hit a sixer, is :

(a) mechanical force (b) muscular force

(c) gravitational force (d) frictional force

vi. The SI unit of force is :

(a) kgf(b) gf

(c) N (d) none of these

vii. The force of friction is :

(a) always an advantage (b) always a disadvantage

(c) neither advantage nor disadvantage (d) sometime advantage and sometime disadvantage

viii. The force applied to a machine to do mechanical work, is called :

(a) load(b) pressure

(c) effort(d) energy

ix. A lemon squeezer is an example of :

(a) lever of third order (b) lever of second order

(c) wedge(d) inclined plane

x. Machines require proper maintenance

(a) for efficient use (b) for preserving them

(c) for making them look sleek (d) none of these

Q.3 Classify the following, as levers of first order, second order and third order :

(a) nut-cracker ______

(b) sea-saw ______

(c) fire-tongs ______

(d) wheel barrow ______

(e) plier______

(f) rowing of a boat ______

(g) bread knife ______

(h) claw-hammer______

Q.4 Classify the following simple machines :

(i) A screw jack ______

(ii) A steering wheel of a car ______

(iii) A staircase ______

(iv) An axe______

(v) A wheel barrow ______

(vi) A ramp______

Q.5 Name the force which :

(a) stops a ball, rising vertically upward______

(b) stops a speeding car ______

(c) makes a moving cricket ball to move faster ______

(d) makes the ripe fruits to fall to ground ______

(e) makes a runner to stop______

(f) makes a steam engine to move______

(g)makes the iron pins to cling to a magnet ______

(h) makes the sail boat to move in the sea ______