Physics ICSE Class 6 Important Questions Chapter 3 Force
Practice Questions
1. Define –
- Applied force
- Tension
- Frictional force
- Magnetic force
- Gravitational force
Answer:
1. A contact force that is applied to an object by humans, animals, or other objects is called applied force. Example : A player kicking a ball.
2. When a connector is pulled by opposing forces from both the ends, the contact force that acts along the length of the connector is called tension. Example : Pulling a bucket of water from a well with a rope. Tension (force) acts along the rope.
3. When a body moves or tries to move over a surface, the force that resists the motion of the body is called frictional force. It is a contact force which opposes the motion of the object. Example : A moving ball stops after covering some distance.
4. The force of attraction that result’s between a magnet and another object is called magnetic force. It is a non-contact force. Example : A magnets attracts iron nails from a distance.
5. Gravitational force can be defined as a universal force of attraction that exists between any two objects that have mass. Example : Gravitational force of earth attracts all objects towards its centre.
Question 2.
Name few metals which are attracted towards magnet.
Answer:
Iron, nickel and cobalt.
Question 3.
List characteristics of gravitational force.
Answer:
- Gravity is affected by the mass of an object – Greater the mass, greater is the gravitational pull.
- Gravity depends upon the distance between the two objects – Greater the distance, less is the gravitational pull.
- Gravitational force is always attractive in nature.
- It is a non-contact force.
Question 4.
Why does the gravitational force of our body not attract the nearby objects towards us ?
Answer:
Air body has a mass that is too small to produce any effective gravitational force and so their effect is not visible and we are unable to attract the nearby objects towards us.
Question 5.
Why is the gravitational pull of the earth much more on the moon than Venus ?
Answer:
Mass of the earth and Venus are almost same but the earth is much nearer to the moon than Venus is. Hence, the ; gravitational pull of the earth is more on the moon than that of venus.
Question 6.
Name two types of electrical charges in objects.
Answer:
Positive charge and negative charge.
Question 7.
On what principle does a spring balance work ?
Answer:
A spring balance works on the principle that a spring gets stretched or compressed when a force is applied on it. Larger the force, more is the stretch or compression. So, the force is measured by measuring the stretch or compression in the spring.
Question 8.
Fill in the blanks :
1. There is no friction between two objects at …………. that are in contact with each other.
Answer:
There is no friction between two objects at rest that are in contact with each other.
2. The size or strength of a force is called its …………..
Answer:
The size or strength of a force is called its magnitude.
3. determined the laws of motion and defined the universal law of gravity.
Answer:
Sir Isaac Newton determined the laws of motion and defined the universal law of gravity.
4. If two or more forces act along the same direction, the resultant force is equal to the …………. of the magnitudes of all the forces being applied individually.
Answer:
If two or more forces act along the same direction, the resultant force is equal to the sum of the magnitudes of all the forces being applied individually.
5. It two or more unequal forces act on the same object along opposite directions, the resultant force is the …………. of their magnitudes.
Answer:
It two or more unequal forces act on the same object along opposite directions, the resultant force is the difference of their magnitudes.
6. The mutual force of attraction between two bodies due to their masses is called ………… force.
Answer:
The mutual force of attraction between two bodies due to their masses is called gravitational force.
7. ………….. is the force with which a body gets attracted towards the centre of the earth.
Answer:
Weight is the force with which a body gets attracted towards the centre of the earth.
8. The …………… force is the single force acting on a body that produces the same effect as the actual forces acting on it.
Answer:
The resultant force is the single force acting on a body that produces the same effect as the actual forces acting on it.
Question 9.
Name the measuring devices of force.
- Extension spring balance.
- Compression spring balance.
Question 10.
What is electrostatic force ?
Answer:
The force exerted by a charged body is called as electrostatic force.
ICSE Class 6 Physics Important Questions