Force, Work, and Energy
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Types of Forces: Friction and Gravity
SubtopicTypes of Forces: Friction and Gravity under Force, Work, and Energy for Grade 4 CBSE.
Preview questions (no answers)
- 1.
Friction always acts to _____ the motion of an object.
A.Help
B.Start
C.Slow down or oppose
D.Speed up
- 2.
If you drop a feather and a heavy metal ball at the same time in a place with no air, which force pulls them both down?
A.Friction
B.Magnetic force
C.Gravity
D.Muscular force
- 3.
What would happen if there was no friction between our feet and the ground?
A.We would walk faster
B.We would not be able to walk and would slip
C.We would fly
D.Nothing would change
- 4.
Which of these is the pull that the Earth exerts on every object on it?
A.Friction
B.Magnetism
C.Gravity
D.Energy
- 5.
What would happen to a ball thrown upwards in space, far away from any planets or stars?
A.It would immediately fall back to the person.
B.It would move in a straight line forever (or until it hits something).
C.It would start orbiting the person.
D.It would catch fire due to friction.
- 6.
Which force prevents a ladder from sliding down when it is leaned against a wall?
A.Gravitational force
B.Frictional force
C.Magnetic force
D.Muscular force
- 7.
If we want to make a heavy box slide more easily across a floor, we should:
A.Make the floor rougher
B.Sprinkle some powder or oil on the floor
C.Increase the weight of the box
D.Remove the wheels from the box
- 8.
A student notices that a wooden block starts to move only when they pull it with a force of . What is the most likely value of the frictional force just before the block starts moving?
A.B.C.D. - 9.
Why are the bottoms of space-capsules shaped like a blunt heat-shield rather than being pointed like a needle?
A.To make them fall faster toward the ocean.
B.To create a 'cushion' of air that helps manage the intense friction and heat during re-entry.
C.To increase the weight of the capsule.
D.To prevent gravity from pulling them too hard.
- 10.
If you hang a weight on a spring, the spring stretches. If you move this entire setup to the Moon, what will happen to the stretch of the spring?
A.It will stretch more because the Moon has no air.
B.It will stretch less because the Moon's gravitational pull is weaker.
C.It will stretch the same amount because the mass of the weight is the same.
D.It will not stretch at all because there is no gravity on the Moon.
Download the worksheet for Force, Work, and Energy - Types of Forces: Friction and Gravity to practice offline. It includes additional chapter-level practice questions.
Simple Machines in Daily Life
SubtopicSimple Machines in Daily Life under Force, Work, and Energy for Grade 4 CBSE.
Preview questions (no answers)
- 1.
Energy obtained from flowing water is called:
A.Solar energy
B.Hydro energy
C.Wind energy
D.Sound energy
- 2.
Which of these is a source of geothermal energy?
A.Wind
B.Sun
C.Internal heat of the Earth
D.Flowing water
- 3.
A bottle cap is often removed using a tool that acts as a lever. Which part of the lever is your hand providing?
A.Fulcrum
B.Load
C.Effort
D.Rod
- 4.
Lifting a school bag is an example of work done against which force?
A.Friction
B.Magnetic force
C.Gravity
D.Elastic force
- 5.
A zipper on a jacket consists of two rows of teeth and a slider. The slider works on the principle of which simple machine?
A.Lever
B.Wedge
C.Pulley
D.Screw
- 6.
If we want to reduce friction between two moving metal parts, we should:
A.Make the surfaces rough
B.Apply sand between them
C.Apply a lubricant like oil
D.Increase the pressure between them
- 7.
Which of these is the ultimate source of almost all energy on Earth?
A.Coal
B.The Sun
C.Electricity
D.Wind
- 8.
A pair of kitchen tongs is a simple machine used to pick up food items. If the tool pivots at Point A, the user squeezes it at Point B, and the food is held at Point C, which of the following correctly identifies the roles of these three points as parts of a lever?
A.Point A: Effort, Point B: Fulcrum, Point C: Load
B.Point A: Fulcrum, Point B: Effort, Point C: Load
C.Point A: Load, Point B: Effort, Point C: Fulcrum
D.Point A: Fulcrum, Point B: Load, Point C: Effort
- 9.
What kind of machine is a 'Chisel' used by a carpenter?
A.A wheel and axle
B.A wedge
C.A pulley
D.A screw
- 10.
Which of these is a way to reduce friction between two surfaces?
A.Making the surfaces rougher.
B.Adding a layer of sand between them.
C.Using ball bearings between the moving parts.
D.Increasing the weight of the object.
Download the worksheet for Force, Work, and Energy - Simple Machines in Daily Life to practice offline. It includes additional chapter-level practice questions.
Renewable and Non-renewable Energy Sources
SubtopicRenewable and Non-renewable Energy Sources under Force, Work, and Energy for Grade 4 CBSE.
Preview questions (no answers)
- 1.
Work is done when a force moves an object through a certain:
A.Time
B.Distance
C.Weight
D.Temperature
- 2.
Which of these is a renewable source of energy that comes from the heat inside the Earth?
A.Solar energy
B.Geothermal energy
C.Coal
D.Natural Gas
- 3.
When we use a hammer to drive a nail into wood, what are we doing?
A.Applying force
B.Creating gravity
C.Producing light
D.None of these
- 4.
If you throw a ball up in the air, why does it come back down?
A.Because of air pressure
B.Because of gravity
C.Because of friction
D.Because of muscular force
- 5.
Energy obtained from the rise and fall of ocean water is known as:
A.Solar energy
B.Tidal energy
C.Wind energy
D.Geothermal energy
- 6.
Which of the following can a force NOT do to an object?
A.Change its shape
B.Make it move
C.Change its color
D.Stop its motion
- 7.
Which of these is NOT a source of energy?
A.Wind
B.Water
C.Stone
D.Sun
- 8.
If all the coal on Earth is used up, why can't we just make more coal immediately?
A.Because the temperature of Earth is now too high.
B.Because coal formation requires millions of years under specific conditions.
C.Because we have forgotten the chemical formula for coal.
D.Because coal can only be made from volcanic ash.
- 9.
In which of the following processes is the Sun's energy stored as chemical energy?
A.Evaporation of water from oceans.
B.Photosynthesis in green plants.
C.Heating of the Earth's atmosphere.
D.Formation of rainbows.
- 10.
Which of these statements about friction is correct?
A.Friction always helps the motion of an object.
B.Friction only acts between two liquids.
C.Friction produces heat.
D.Friction is a non-contact force.
Download the worksheet for Force, Work, and Energy - Renewable and Non-renewable Energy Sources to practice offline. It includes additional chapter-level practice questions.