Q1. Fill in the blanks.
To draw water from a well we have to pull
at the rope.
A charged body attracts an uncharged
body towards it.
To move a loaded trolley we have to push
or pull it.
The north pole of a magnet repels
the north pole of another magnet.
The atmospheric pressure is due to the
weight of air present in the atmosphere above us.
Force has magnitude as well as
Liquids exert equal pressure at the same depth.
Liquids and gases exert pressure on the walls
of their containers.
Air exerts pressure in all directions. True
The north pole of a magnet attracts the
north pole of another magnet. False
The pressure exerted by a liquid depends on
the area of base of its container. True
To draw water 'from a well, we have to
apply push force at the rope. False
A force arises due to the interaction
between two objects. True
The strength of a force is usually
expressed by its magnitude. True
Q3. What is the unit of force?
Q4. Give one example where force moves a stationary object.
Q5. Give one example where force stops a moving object.
Ans. A fielder stopping a ball
Q6. What is force?
push or a pull on an object is called a force.
Q7. Does liquid exert pressure in all directions?
Liquid exerts pressure in all directions.
Q8. Why does the shape of tooth paste tube change when we
Ans. The shape changes because our finger applies
force on the tube.
Q9. What can bring change in state of motion of an object?
force may bring a change in the state of motion of an object.
Q10. Which force can be used to gather iron pins scattered on
force can be used to gather iron pins scattered on the floor.
Q11. Which force do the animals apply while moving, chewing and
doing other activities?
Ans. Muscular force
Q12. Which force is responsible for raising our body hair when
we try to take off a terylene or polyester shirt in the dry weather?
Ans. Electrostatic force
Q13. Write one example where force changes the speed of a moving
Ans. Speed of moving a rubber tyre or a ring increases
whenever it is pushed.
Q14. Why does a boat come to rest when we stop rowing it?
Ans. Friction between water and the boat brings it to a
stop once we stop rowing.
Q15. Write any two application of atmospheric pressure in our
Drinking straw and Dropper work on the existence of atmospheric pressure.
Q16. Explain why, snow shoes stop you from sinking into snow.
Ans. The snow shoes have large, flat soles so they
exert less on the soft snow and stop the wearer from sinking into it.
Q17. What happens to the springs fixed to the seat of a bicycle
when we sit on it?
Ans. When we sit on the seat of a bicycle, the force
exerted by the body weight compresses the spring and changes its shape.
Q18. Give one practical application of magnetic force.
Ans. The closing of door of refrigerator works on the
application of magnetic forces.
Q19. Give one example from daily life where force changes the
shape of an object.
The shape of dough changes on pressing with a rolling pin to make chapatis.