Force, Energy and Work - 2 Class 6 Worksheet Science

Q1: Fill in the blanks.

(i) A force is a __________ or a __________.
Ans: pull or a push.
A force is a physical interaction between two objects that can cause a change in their motion or shape. When we push or pull an object, we apply a force to it.

(ii) The force of __________ pulls everything down.
Ans: gravity
Gravity is a fundamental force that attracts all objects with mass towards each other. It is responsible for the force that pulls objects towards the Earth's surface.

(iii) When a force moves an object, __________ is done.
Ans: work
Work is done when a force is applied to an object, and the object moves in the direction of the force. The amount of work done is equal to the force applied multiplied by the distance the object moves in the direction of the force.

(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 a force that opposes the relative motion between two surfaces in contact. When a football rolls on the ground, it experiences friction with the ground, which gradually slows it down and brings it to a stop.

Q2: True or False.

(i) Things can move without any force acting on them.
Ans: False
According to Newton's First Law of Motion, an object will remain at rest or move with a constant velocity (constant speed and direction) unless acted upon by an external force. So, for an object to move, a force is required.

(ii) Energy is required to do work.
Ans: True
Yes, to perform work on an object, energy is required. Work is the transfer of energy from one object to another by applying a force and causing displacement in the direction of the force.

(iii) If a moving object comes to a stop, it means some force is acting on it.
Ans: True
According to Newton's First Law of Motion, an object in motion will stay in motion unless acted upon by an external force. So, if a moving object comes to a stop, it means some force is acting on it, causing it to decelerate and eventually stop.

(iv) Energy in food indirectly comes from the Sun.
Ans: True
The Sun is the ultimate source of energy for most living organisms on Earth. Plants use sunlight during photosynthesis to convert it into chemical energy, and then animals (including humans) obtain this energy by consuming plants or other animals.

(v) Energy of wind can be used to generate electricity.
Ans: True
Yes, the kinetic energy of wind can be harnessed to generate electricity using wind turbines. Wind turbines capture the energy of the moving air and convert it into electrical energy, which can be used to power homes and industries.

Q3: Complete the following sentence by inserting suitable words.

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

(i) Energy is needed to perform __________. 
Ans: work
As mentioned earlier, work involves the transfer of energy from one object to another. To perform work on an object, energy is required.
(ii) Capacity of doing work is called __________.
Ans: energy
Energy is the ability or capacity to do work. It exists in various forms such as kinetic energy, potential energy, thermal energy, electrical energy, etc. 

(iii) The source of energy in a car is __________.
Ans: petrol  
In a conventional car, petrol (gasoline) is used as a fuel. When petrol is burnt in the engine, it releases energy, which is converted into mechanical work to move the car.

(iv) We apply __________ pushing and pulling.
Ans: force
We apply force when we push or pull objects. Pushing involves applying a force away from our body, while pulling involves applying a force towards our body. 

(v) The Sun is the main __________ of energy.
Ans: source
The Sun is the primary source of energy for life on Earth. It provides light and heat energy, which is essential for various processes, including photosynthesis and the Earth's climate. 

(vi) A trolley driver __________ work.
Ans: does
When a trolley driver pushes or pulls a trolley, they are applying force to move the trolley. As a result, work is done on the trolley, and energy is transferred to it.

(vii) Force is applied to change the direction of __________ of a body.
Ans: movement 
Force can change the motion of an object, including changing its speed, direction, or both. When a force acts on an object, it can cause the object to accelerate, decelerate, change direction, or come to a stop.

Q4: Name the following.

(i) Energy you get by burning fuels
Ans: heat energy
When fuels like coal, petrol, or natural gas are burned, the chemical energy stored in them is converted into heat energy. (ii) Energy that plants use to make food
Ans: light energy
Plants use light energy from the Sun during the process of photosynthesis to convert carbon dioxide and water into glucose (a form of chemical energy).

(iii) Energy that we use to run a fan
Ans: electrical energy
The energy used to run an electrical fan is electrical energy. It is supplied through the electrical power grid and converted into mechanical energy in the fan.

(iv) Our main source of energy; it gives us heat and light energy
Ans: sun
The Sun is the primary source of energy for life on Earth. It provides heat energy through its radiation and light energy, which is essential for various processes on our planet.