0ASSIGNMENT: 1
Force And Pressure:
Q1) Fill in the blanks:
a. A force arises due to __________ between two objects.
b. An example of a non-contact force is __________.
c. The pressure exerted by air around us is known as __________.
d. Strength of the force is expressed by its __________.
e. Application of force can change the __________, __________ and __________ of an object.
f. Force exerted by our muscles is called __________ force.
g. Direction of force of friction is always __________ to the direction of motion.
h. Force per unit area is called ___________.
Q2) Complete the following sentences:
a. If two equal forces act in the opposite directions on an object, the net force acting on it is __________.
b. It is easier to cut with a sharp knife than with a blunt one because ________________________ ____________________.
c. Porters place a round piece of cloth on their heads, when they have to carry heavy loads because __________________________________________________.
Q3) Give four effects of force. Write one example of each.
Q4) Name:
a) The force exerted by all matter on all other matter
b) The force which tends to slow down objects or keep them from moving
c) The force with which a charged body attracts an uncharged body.
Q5) An example of a contact force is
1) Magnetic force
2) Frictional force
3) Gravitational force
4) All of these
Q6) A Force cannot change the
1) Speed of an object
2) Mass of an object
3) Shape of an object
4) The direction of a moving object
Q7) The pull of the earth is a force called
a) Gravitational force
b) Frictional force
c) Electrostatic forces
d) None of these
Q8) If a force is applied on a smaller area of contact, the pressure exerted by it is
1) Greater
2) Lesser
3) The same
4) None of these
