Question

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
Q9 Define Pressure. Explain why shoulder bags are provided with broad straps and not thin
strap.
Q 10) A ball rolling on the ground comes to rest after some time. Name the force involved.
Q 11) Explain the following types of forces. Give one example where each of these could be
found operating:
a. Magnetic force c) Electrostatic force
b. Gravitational force d) Frictional force

Answer 1

Q6)When a certain amount of force is applied on any object that exerts the pressure that is able to compress the substance,then force is able to change the shape