science
Grade-7
Easy
Question
Harry makes a list of objects that he generally sees around and categorizes them into two categories, viz., objects under the action of balanced forces and unbalanced forces. Surprisingly, he found out that most objects under the first category are ___ and the second category are ___.
- Stationary, in uniform motion
- In non-uniform motion, in uniform motion
- Stationary, in non-uniform motion
- In non-uniform motion, stationary
Hint:
When unbalanced forces act on a body, they produce a change in its state of rest or of uniform motion
The correct answer is: Stationary, in non-uniform motion
- Balanced force:Forces acting on an object which does not change the state of rest or of uniform motion of it are called balanced forces.
- Unbalanced force:The resultant of two opposite forces acts on an object and brings it in motion. These opposite forces are called unbalanced forces
- When unbalanced forces act on a body, they produce a change in its state of rest or of uniform motion. Unbalanced forces acting on a body can change its speed or direction of motion.
- A stationary object is one which is not moving or changing its position. It is at rest. In that position, all the forces acting on it cancel each other's effect or the sum of the magnitude of all the forces is equal to zero,hence it is balanced force
- So option A is correct
Related Questions to study
science
Find the net force on the rope in the situation given below.
Find the net force on the rope in the situation given below.
scienceGrade-7
science
The figure below shows two boys hanging from a branch of a tree. The weight of the two boys is equal, i.e., 437 N each. What is the net force that they exert on the branch?
The figure below shows two boys hanging from a branch of a tree. The weight of the two boys is equal, i.e., 437 N each. What is the net force that they exert on the branch?
scienceGrade-7
science
An object is pulled from opposite sides with forces, as shown. Find the net force acting on the object by taking the positive reference direction towards the left.
An object is pulled from opposite sides with forces, as shown. Find the net force acting on the object by taking the positive reference direction towards the left.
scienceGrade-7
science
The forces exerted on a tank by two people from opposite directions are shown in the figure below. Find out the net force on the tank, taking the positive reference direction towards the right?
The forces exerted on a tank by two people from opposite directions are shown in the figure below. Find out the net force on the tank, taking the positive reference direction towards the right?
scienceGrade-7
science
Which of the following actions can be done by applying force?
a) Squeezing the toothpaste out of the tube
b) Dragging a heavy load
c) Swirling a stone tied to a string around
d) Lifting heavy luggage
e) Opening and closing a door
Which of the following actions can be done by applying force?
a) Squeezing the toothpaste out of the tube
b) Dragging a heavy load
c) Swirling a stone tied to a string around
d) Lifting heavy luggage
e) Opening and closing a door
scienceGrade-7
science
Observe the diagram below and choose the right description of the force applied to the body from the following options.
Observe the diagram below and choose the right description of the force applied to the body from the following options.
scienceGrade-7
science
Sam kicks a football; it moves 20 m. His son Lee kicks the same football; it moves 17 m. Who applied a greater force? To what kind of force was the football subjected?
Sam kicks a football; it moves 20 m. His son Lee kicks the same football; it moves 17 m. Who applied a greater force? To what kind of force was the football subjected?
scienceGrade-7
science
The net force acting on a body is found to be – 43 N. What do the sign and the number indicate?
The net force acting on a body is found to be – 43 N. What do the sign and the number indicate?
scienceGrade-7
science
When a force acts on an object at rest, it causes it to ___.
When a force acts on an object at rest, it causes it to ___.
scienceGrade-7
science
Leela sees her friends playing by hanging on the branch of a tree and wonders why the branch does not move at all. She then tried hanging herself on the same branch, and the branch still did not move. What could be a possible reason for this?
Leela sees her friends playing by hanging on the branch of a tree and wonders why the branch does not move at all. She then tried hanging herself on the same branch, and the branch still did not move. What could be a possible reason for this?
scienceGrade-7
science
An object is pulled from opposite sides with forces, as shown. Find the net force acting on the object by taking the positive reference direction towards the right.
An object is pulled from opposite sides with forces, as shown. Find the net force acting on the object by taking the positive reference direction towards the right.
scienceGrade-7
science
The forces exerted on a tank by two people from opposite directions are shown in the figure below. Find out the net force on the tank taking the positive reference direction towards the left?
The forces exerted on a tank by two people from opposite directions are shown in the figure below. Find out the net force on the tank taking the positive reference direction towards the left?
scienceGrade-7
science
What is the net force on the body, and in which direction?
What is the net force on the body, and in which direction?
scienceGrade-7
science
The upward muscular and the downward gravitational forces acting on a ball thrown up are shown in the figure below. What is the net force on the ball, and in which direction does it act?
The upward muscular and the downward gravitational forces acting on a ball thrown up are shown in the figure below. What is the net force on the ball, and in which direction does it act?
scienceGrade-7
science
Two students, A and B, push against each other. Initially, they do not move at all. However, after some time, A moves forward, and B moves backward. Which of the following statement (s) describes this condition?
a) Initially, A and B were applying forces of equal magnitude and opposite in direction to each other.
b) Later, A applied lesser force than B.
c) Later, B applied lesser force than A.
d) Initially, the forces were balanced. However, later the forces became unbalanced.
Initially, the forces were unbalanced. However, later the forces became balanced.
Two students, A and B, push against each other. Initially, they do not move at all. However, after some time, A moves forward, and B moves backward. Which of the following statement (s) describes this condition?
a) Initially, A and B were applying forces of equal magnitude and opposite in direction to each other.
b) Later, A applied lesser force than B.
c) Later, B applied lesser force than A.
d) Initially, the forces were balanced. However, later the forces became unbalanced.
Initially, the forces were unbalanced. However, later the forces became balanced.
scienceGrade-7
