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
Answers
Answer:
> question number: 1
a)interaction.
b)magnetic force.
c)atmospheric pressure
d)magnitude.
e)shape,speed,direction of motion
f) muscular force
g)opposite to that of motion
h)pressure.
> question number: 2
a)zero
b)it is easy to cut with the former then with the latter.
c)the round piece of the cloth on there head increases the area on which the force will act
> question number: 3
Effects of force are as followed:
1) A force can move a stationary object.
2) A force can stop a moving object.
3) A force can change the speed of a moving object.
4) A force can change shape and size of an object.
> question number: 4
a) gravitational force
b) frictional force
c) electrostatic force
> question number: 5
a) frictional force
> question number: 6
a) mass of an object.
> question number: 7
a) Gravitational force
> question number: 8
a)Greater.
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