Energy And Work

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Q1. A push or a pull is called:
Force is any action that can change the state of motion of an object. We apply force when we push, pull, lift or throw something.
Q2. The energy we get from food is called:
Food contains chemical energy which is released inside our body. This energy helps us to grow, work and play.
Q3. Which type of energy is stored in a stretched rubber band?
Potential energy is stored energy that is waiting to be used. A stretched rubber band has potential energy that changes to kinetic when released.
Q4. The energy of a moving object is called:
Kinetic energy is the energy possessed by an object that is moving. A rolling ball or a running child has kinetic energy.
Q5. A lever works on a fixed point called:
Fulcrum is the fixed point on which a lever turns. It is the support around which the lever moves.
Q6. In a lever, the turning point is also called:
Pivot and fulcrum both mean the fixed point where the lever turns. Both words are used for the same thing in simple machines.
Q7. The force applied to a lever to move an object is called:
Effort is the force that we apply on the lever to lift or move something. It is our pushing or pulling action on the lever.
Q8. The weight that is lifted by a lever is called:
Load is the object or weight that we want to lift or move. It is the resistance that the lever overcomes.
Q9. A seesaw is an example of:
A seesaw is a simple lever that moves up and down on a fixed point. It is the most common example of a lever that children use.
Q10. Scissors are an example of:
In scissors, the fulcrum is in the middle between the load and the effort. The pivot point is at the centre where the blades cross.
Q11. A nutcracker is an example of:
In a nutcracker, the load (nut) is in the middle and effort is applied at the ends. The fulcrum is at one end of the lever.
Q12. A fishing rod is an example of:
In a fishing rod, the effort is applied in the middle and load is at the tip. The fulcrum is at the handle end of the rod.
Q13. A simple machine used to lift heavy loads with a rope is:
Pulley has a wheel with a groove and a rope that runs over it. It helps lift heavy objects easily by changing the direction of force.
Q14. A ramp used to roll things up is called:
Inclined plane is a flat sloping surface like a ramp. It makes it easier to move heavy objects up or down.
Q15. A wheel with teeth is called a:
Gears are wheels with teeth that fit into each other. They are used to transfer motion from one part to another in machines.
Q16. A sharp wedge is used to:
Wedge is a simple machine with a sharp edge used for cutting. Examples include knives, axes and nails.
Q17. An inclined plane is also called a:
A ramp is a sloping surface that is easier to walk or roll things on. It is another name for an inclined plane.
Q18. A screw is a simple machine that has:
Screws have spiral ridges called threads that help them grip. They are used to hold things together firmly.
Q19. A knife is an example of a:
A knife has a sharp sloping edge which is a wedge. It helps us cut fruits, vegetables and other things.
Q20. A flag hoisting uses which simple machine?
Pulley helps pull the flag up with the help of a rope. The wheel turns and makes it easy to raise the flag.
Q21. The force that pulls everything towards the earth is:
Earth’s gravity pulls all objects towards its centre. This is why things fall down when we drop them.
Q22. The force you use when you push a door is:
Muscular force is the force exerted by our muscles. We use this force when we push, pull, lift or throw things.
Q23. The force that slows down moving objects is called:
Friction is the resistance between two surfaces rubbing against each other. It slows down moving objects like a rolling ball.
Q24. A magnet attracts iron objects due to:
Magnetic force is the force that attracts iron and steel objects. Magnets have two poles and pull things made of iron.
Q25. A moving car stops when brakes are applied because of:
Brakes create friction between the brake pads and wheels. This friction slows down and stops the moving car.
Q26. Lightning is a form of:
Lightning is a natural spark of electrical energy in the sky. It is caused by the movement of electric charges in clouds.
Q27. Energy from the sun is called:
Solar energy comes from the sun in the form of light and heat. We use solar panels to convert this energy into electricity.
Q28. Energy from moving air is called:
Wind energy is produced by the movement of air. Windmills capture this energy and convert it into electricity.
Q29. Energy from flowing water is used to generate:
Flowing water has a lot of kinetic energy. Dams use this energy to spin turbines and produce electricity.
Q30. The energy produced by burning wood is:
Burning wood releases heat energy. This heat is used for cooking food and keeping us warm.
Q31. A stretched bow has which type of energy?
A stretched bow stores potential energy in its bent parts. When released, this stored energy turns into kinetic energy and shoots the arrow.
Q32. A moving bicycle has:
A moving bicycle is in motion, so it has kinetic energy. The faster it moves, the more kinetic energy it has.
Q33. The energy in our muscles comes from:
Our muscles get energy from the food we eat. The chemical energy in food is converted into muscular energy for movement.
Q34. A simple machine that has a wheel and a rope is:
A pulley has a grooved wheel with a rope passing over it. It makes lifting heavy objects much easier.
Q35. A seesaw has its fulcrum in the:
In a seesaw, the fulcrum is exactly in the middle. This makes it balanced and fun for two people.
Q36. Which machine helps us to cut vegetables?
A knife is a wedge that has a sharp edge. This sharp edge helps us cut vegetables easily.
Q37. A bottle cap is an example of a:
A bottle cap has threads like a screw. It twists and holds the bottle tightly.
Q38. A staircase is an example of a:
A staircase is a series of inclined planes. It makes it easier to go up and down a building.
Q39. Force of friction is useful when we:
Friction between our shoes and the road helps us walk. Without friction, we would slip and fall.
Q40. The energy from dead plants and animals is called:
Biomass energy comes from dead plants and animal waste. It is burned to produce heat and electricity.
Q41. A doorknob is an example of a:
A doorknob has a wheel (the knob) attached to an axle (the rod). Turning the wheel makes the axle turn and opens the door.
Q42. The fulcrum in a nutcracker is at the:
In a nutcracker, the fulcrum is at one end where the handles are joined. The nut is placed in the middle.
Q43. Which lever has effort in the middle?
In a third order lever, the effort is applied in the middle. The load is at one end and fulcrum at the other.
Q44. A screw is used to:
Screws have threads that grip into wood or metal. They are used to join and hold things tightly.
Q45. Which force helps a magnet to stick on a fridge?
Magnet sticks to a fridge because of magnetic force. The fridge is made of iron which magnets attract.
Q46. Rubbing hands together produces:
When we rub our hands, friction between the palms produces heat. This is why our hands feel warm.
Q47. Which lever has load in the middle?
In a second order lever, the load is placed in the middle. The fulcrum is at one end and effort at the other.
Q48. Energy from the sun is used in:
Solar panels capture sunlight and convert it into electricity. They are used to power lights and appliances.
Q49. The turning effect of a lever is called:
Torque is the turning or twisting force of a lever. More effort or longer lever gives more torque.
Q50. Which type of force is used when a bull pulls a cart?
The bull uses its muscular force to pull the cart. Its strong muscles help it move heavy loads.
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Q51. Heat energy from the sun is used to:
The sun provides heat for many useful things. It dries clothes, cooks food in solar cookers and helps plants grow through sunlight.
Q52. A gear system is found in:
Bicycles have gears that help us ride on different terrains. Gears make pedalling easier on hills and faster on flat roads.
Q53. The energy of running water is used in:
Dams use the kinetic energy of flowing water. This water spins turbines to produce electricity.
Q54. A trolley bag uses which simple machine?
A trolley bag has wheels that make it easy to pull. The wheel and axle help it roll smoothly on the ground.
Q55. Which force is used when we kick a football?
Our leg muscles provide the force to kick a football. This muscular force makes the ball move.
Q56. Energy cannot be created or destroyed; it can only be:
Energy only changes from one form to another. For example, chemical energy in food changes into muscular energy.
Q57. A pair of tongs is an example of which lever?
In tongs, the effort is applied in the middle between the fulcrum and load. The fulcrum is at the joined end.
Q58. Which machine uses the principle of inclined plane?
Stairs work like an inclined plane to go up. They make climbing easier than going straight up.
Q59. Electricity in our homes is a form of:
Electricity is electrical energy that powers our lights and appliances. It is generated at power stations.
Q60. A wheel and axle is found in:
A wheel and axle is used in many things. Bicycles, cars, and doorknobs all have this simple machine