29 Questions
What is the force that opposes the motion between the surfaces of the book and the table?
Frictional force
What force must be acting on a moving object opposing its motion?
Frictional force
Why does a vehicle slow down when brakes are applied?
Due to application of frictional force by brakes
Why is it difficult to walk on a smooth and wet floor?
Due to increase in frictional force
What is the reason for a moving ball on the ground to stop after some time?
Application of frictional force
What device is used for measuring the force acting on an object?
Spring balance
Which force causes slipping when stepping on a banana peel?
Frictional force
What happens to the reading on the spring balance when a piece of polythene is wrapped around the brick?
It increases
In the above activity, where is the force of friction acting?
Between the surface of the brick and the floor
What does the distance covered by a pencil cell moving down from a point A on an inclined plane depend on?
The nature of the surface on which the cell moves
What causes friction between two surfaces?
Irregularities on the two surfaces locking into one another
What happens to the force of friction if a rough surface is involved?
The force of friction is greater
What does wrapping a piece of jute bag around a brick demonstrate?
Different materials can affect the force of friction differently
What is stretched when a force is applied to a spring balance?
The coiled spring
What is a force?
A push or a pull
What does the distance moved by an object in unit time indicate?
The object's speed or velocity
What makes an object slow down or go faster?
Force applied on the object
How do fielders stop a ball hit by a batsman?
By applying a force on the ball
What can actions like kicking, hitting, pushing, and pulling be used to describe?
Tasks related to force
What happens to a moving ball on the ground when a force is applied to it?
It may slow down, speed up, or change direction
What is the term used in science for a push or pull on an object?
Force
In the context of motion of objects, can you infer that to move an object, it has to be pushed or pulled?
Yes, it always has to be pushed and pulled
What is the action called in science when an object is lifted?
Lifting
What type of force is exerted when a magnet attracts a piece of iron?
Attractive force
In the scenario of a man standing behind a stationary car, will the car move due to his presence?
No, unless he applies a force
In Fig. 8.3 (a), what do both girls appear to be doing to each other?
Pushing each other
Who is exerting the force in Fig. 8.2 (b) to make the car move?
The man
What happens when similar poles of two magnets repel each other?
Pushing each other
What is the term used in science for the action of drawing a bucket of water from a well?
Pulling
Test your knowledge on the concept of friction and its effects on objects in motion. Explore why vehicles slow down when brakes are applied, why moving objects eventually stop, and why slipping occurs on certain surfaces like a banana peel.
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