Class 5 Science Frictional force – Notes Question Answers
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Multiple choice questions (15*1=15)
1.) Which of the following force is responsible for earth pulling things towards it?
a) Magnetic force
b) Gravitational force
c) Frictional force
d) Tension force
Answer: b) Gravitational force
2.) Which of the following surfaces generally has more friction?
a) Smooth and polished
b) Rough and irregular
c) Wet and slippery
d) Hot and dry
Answer: b) Rough and irregular
3.) What is the unit of measurement for friction?
a) Meters
b) Newtons
c) Kilograms
d) Watts
Answer: b) Newtons
4.) Which force helps you walk on the ground without slipping?
a) Magnetic force
b) Gravitational force
c) Frictional force
d) Tension force
Answer: c) Frictional force
5.) When we rub our hands together, what type of friction takes place?
a) Static friction
b) Rolling friction
c) Static friction
d) Air resistance
Answer: c) Static friction
6.) How can you increase friction between two surfaces?
a) Make the surfaces smoother
b) Add oil between them
c) Making the surface rough
d) Reduce the surface area in contact
Answer: c) Making the surface rough
7.) We apply grease in machineries to:
a) Increase friction
b) Reduce friction
c) Increase speed
d) Increase weight
Answer: b) Reduce friction
8.) Which of the following is an example of rolling friction?
a) Sliding a book across a table
b) Pushing a car with flat tires
c) Riding a bicycle
d) Skating on ice
Answer: c) Riding a bicycle
9.) What is the primary purpose of using oil or grease on moving parts?
a) To increase friction
b) To reduce friction
c) To make them shiny
d) To make them magnetic
Answer: b) To reduce friction
10.) Which type of surface offers less friction for ice skating?
a) Smooth ice
b) Rough ice
c) Wet ice
d) Wooden floor
Answer: a) Smooth ice
11.) Which force opposes the motion of a car on a road?
a) Gravitational force
b) Frictional force
c) Magnetic force
d) Elastic force
Answer: b) Frictional force
12.) What happens to friction when we slide a heavy box on a carpet?
a) Friction increases
b) Friction decreases
c) Friction remains the same
d) Friction becomes magnetic
Answer: a) Friction increases
13.) What force allows you to grip a pencil and write without it slipping from our hand?
a) Magnetic force
b) Gravitational force
c) Frictional force
d) Tension force
Answer: c) Frictional force
14.) Which factor doesn’t affect the frictional force between two objects?
a) The weight of the objects
b) The roughness of the surfaces
c) The temperature of the environment
d) The shape of the objects
Answer: c) The temperature of the environment
15.) What type of friction occurs when an object is in motion?
a) Static friction
b) Rolling friction
c) Kinetic friction
d) Magnetic friction
Answer: c) Kinetic friction
Write where the friction is happening for the following activity? (5*1=5)
Activity | Where is the friction? |
a. Running | |
b. Writing | |
c. Moving car | |
d. Skating | |
e. Rolling football |
Answer:
- Between our feet and ground
- Between pen and sheet
- Between road and tire
- Between ice and blades of skate
- Between football and field
State True/False in the following sentences (5*1=5)
1.) Frictional force always opposes with the motion of the objects.
Answer: True
2.) Rough surfaces have less friction than smooth surfaces.
Answer: False
3.) Walking is an example of frictional force in daily life.
Answer: True
4.) Oil and grease reduce friction between surfaces.
Answer: True
5.) Frictional force doesn’t get affected by the weight of the object.
Answer: False
Short answer questions (5*1=5)
1.) Why a rolling ball does stops after some time?
Answer: Friction slows down the motion of a rolling ball and eventually brings it to a stop.
2.) Definition of friction.
Answer: Friction is the action that opposes the motion between two objects or surface come in contact.
3.) Why do we fine difficulty while walking on wet road?
Answer: we find difficulty while walking on wet road as the friction of a wet road is very less, so out shoes cant get a proper grip and we tend to slip while walking.
4.) Why shoe soles are made rough?
Answer: the shoe soles are made rough because the grooves increase the friction between the road and the shoe and provide better grip and stability while walking.
5.) Give one example of frictional force in daily life.
Answer: Drilling nails in a wall to put photo frame is an example of frictional force used in daily life.
Descriptive answer questions (5*2=10)
1.) Explain frictional force with example.
Answer: Frictional force is the force that generated when two objects get in contact with each other and opposes motion. Example: applying brake to stop a car on road.
2.) Write the methods how we can increase and decrease friction
Answer: We can increase friction by making any surface rougher to make it less slippery and we can decrease friction by using oil and grease to make surfaces slide smoothly.
3.) Why rubbing our hands together produce heat?
Answer: When we rub our hands together friction happens and this frictional force converts the energy from kinetic energy to thermal energy, so we feel warmth in our palms.
4.) Why do we need special shoes for hiking?
Answer: Special shoes have grips underneath it which increases friction with the ground providing better stability while hiking in the mountains.
5.) Why friction is important in our daily life?
Answer: Friction is very important because it enables us to walk, run, write, drive car, push objects, hold things, light matchsticks by providing necessary traction.
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