Question Answers For All Chapters – General Science Class 6
Force and Types of Force
Exercise
1. 1. Choose the term to fill in the blanks.
Answer – (a) Force has to be applied to change the direction of a moving object.
(b) When an elephant drags a wooden log over the land, the forces that are applied on the log are muscular force, gravitational force, and frictional force.
(c) A ball was set rolling on a large table. If its motion is to be changed, a force will have to be applied on it.
(d) The force of friction always acts against the motion.
2. Match the following:
Answer – (i) An ox pulling a cart → (c) Muscular force
(ii) Lifting a heavy iron object with a crane → (b) Mechanical force
(iii) Weighing with a spring balance → (d) Gravitational force
(iv) Applying brakes to a bicycle → (e) Frictional force
(v) Picking up pieces of paper with a plastic scale → (a) Electrostatic force
3. One or more forces are acting in the following examples. Name them.:
Answer – (a) An object falling from a tall building → Gravitational force
(b) An aeroplane flying in the sky → Muscular force, mechanical force, gravitational force, and frictional force
(c) Squeezing sugarcane juice with a squeezer → Muscular force and frictional force
(d) Winnowing food grain → Muscular force and air resistance
4. Explain in your own words giving one example each.
Answer – Muscular force: The force applied by muscles. Example: Lifting a school bag.
Gravitational force: The force by which the Earth pulls objects toward itself. Example: A falling apple.
Mechanical force: The force applied by machines. Example: A washing machine spinning clothes.
Electrostatic force: The force exerted by electrically charged objects. Example: A rubbed balloon attracting paper pieces.
Frictional force: The force that opposes motion. Example: A bicycle stopping when brakes are applied.
Magnetic force: The force exerted by a magnet. Example: A magnet pulling iron nails.
5. Why?
Answer – (a) Machines are oiled from time to time → To reduce friction and make them work smoothly.
(b) An object thrown upwards comes down after reaching a point → Because of the gravitational force of the Earth.
(c) Powder is sprinkled on a carrom board → To reduce friction and help the striker move smoothly.
(d) The ramp at a railway station has a rough surface → To increase friction and prevent people from slipping.
6. In what way are we different?
(a) Muscular force and mechanical force.
Answer – Muscular force is applied by muscles, while mechanical force is applied by machines.
(b) The force of friction and gravitational force.
Answer – Frictional force opposes motion, while gravitational force pulls objects toward the Earth.
7. Write answers to the following questions in your own words.
(a) What are the things that can be done by applying force ?
Answer – Moving objects, stopping objects, changing the direction of objects, and changing their shape.
(b) What is meant by weight ?
Answer – Weight is the force of gravity acting on an object.
(c) Which machines run on muscular force ?
Answer – Bicycle, hand pump, sewing machine (manual), and manual grinding stone.
8. Solve the following crossword puzzle.
Answer – Down:
- Muscular – Force needed to push a scooter that has failed.
- Magnetic – Force used to pick up scattered pins.
Across:
- Magnet – Pulls an iron nail towards itself.
- Mechanical – Force used when a farm is plowed with a tractor.
- Gravitational – The force that causes raindrops to fall to the ground.
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