Force, Energy and Work - 2 Class 6 Worksheet Science

Q1: Fill in the blanks.

(i) A force is a __________ or __________.
Ans: pull or push.
When we push or pull an object, we apply a force to it. A force is a physical interaction that can make an object start moving, stop, change speed or change shape.

(ii) The force of __________ pulls everything down.
Ans: gravity
Gravity is the pull that attracts objects towards the Earth. It is why things fall to the ground when we drop them.

(iii) When a force moves an object, __________ is done.
Ans: work
Work is done when a force makes an object move in the direction of the force. For example, when you push a box, and it moves, you are doing work on the box.

(iv) Coal and petrol have energy stored in them. They are called __________.
Ans: fuels
Fuels are substances that store energy, and they can release this energy through combustion (burning). Coal and petrol are examples of fossil fuels, and they contain stored energy in the form of chemical energy.

(v) A moving football comes to a stop after some time because of the force of __________.
Ans: friction
Friction is the force between the football and the ground (or the air) that slows the ball down and eventually makes it stop.

Q2: True or False.

(i) Things can move without any force acting on them.
Ans: False
Explanation: Objects need a push or a pull to start moving or to change their motion. In everyday life, forces such as pushes, pulls, or friction are needed to make things start, stop or change direction.

(ii) Energy is required to do work.
Ans: True
Explanation: To do work, we must use energy. For example, to lift a book, we use our muscles, which expend energy to move the book against gravity.

(iii) If a moving object comes to a stop, it means some force is acting on it.
Ans: True
Explanation: A moving object usually slows down because of external forces on it. These forces reduce the object's motion and make it stop.

(iv) Energy in food indirectly comes from the Sun.
Ans: True
Explanation: Plants use sunlight to make food, and animals get energy by eating plants or eating animals that ate plants. So the Sun is the original source of most of the energy in food.

(v) The energy of wind can be used to generate electricity.
Ans: True
Explanation: Wind turbines catch the movement of air and change it into electrical energy, which can be used in homes and schools.

Q3: Complete the following sentence by inserting suitable words.

force, movement, energy, source, work, does, petrol

(i) Energy is needed to perform __________. 
Ans: work
Work means moving something by applying a force. To do this, we need energy.

(ii) Capacity of doing work is called __________.
Ans: energy
Energy is what allows us to do work, such as lifting, heating or moving objects.

(iii) The source of energy in a car is __________.
Ans: petrol
In many cars, petrol is used as the fuel. Burning petrol releases energy that makes the car move.

(iv) We apply __________ pushing and pulling.
Ans: force
When we push or pull something, we use a force to change its motion or position.

(v) The Sun is the main __________ of energy.
Ans: source
The Sun provides light and heat, and is the main source of energy for life on Earth.

(vi) A trolley driver __________ work.
Ans: does
When a trolley driver pushes or pulls the trolley and it moves, the driver is doing work on the trolley.

(vii) Force is applied to change the direction of __________ of a body.
Ans: movement
A force can change how an object is moving, for example, by making it turn or stop.

Q4: Name the following.

(i) Energy you get by burning fuels
Ans: heat energy
When fuels burn, their stored chemical energy becomes heat, which can warm rooms or boil water.

(ii) Energy that plants use to make food
Ans: light energy
Plants use light from the Sun to make food by a process called photosynthesis. Light energy becomes stored as plant food.

(iii) Energy that we use to run a fan
Ans: electrical energy
Electricity supplies energy to a fan, which the fan changes into motion (mechanical energy) to move air.

(iv) Our main source of energy; it gives us heat and light energy
Ans: sun
The Sun is the main source of heat and light for Earth and supports life by giving energy to plants and warming the world.