Balanced and Unbalanced Forces

Q.

Difference between balanced and unbalanced force.

Q.

Derive the three equations of motion.

Q.

An object experiences a net zero external unbalanced force. Is it possible for the object to be traveling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If not, provide a reason.

Q. An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity?

Q. What is the first law of motion?

Q. What is the different between non-uniform velocity and acceleration?

Q.

The two forces equal in magnitude but acting opposite in direction on a body are called unbalanced forces.

1. False

2. True

Q.

What is the effect of force on (1) a rigid body, (2) non rigid body

Q.

When balanced forces act on a body, the body is:

1. Moving with variable speed.

2. Accelerating

3. Moving with variable velocity

4. Either at rest or moving with constant velocity.

Q.

___________ is a force, which always opposes the motion of one body over the other body in contact with it.

1. Frictional force

2. Normal force

3. Gravitational force

4. Reaction force

Q. Choose the correct statement(s):
Statement 1: Unbalanced forces can change the direction of motion of a body.
Statement 2: A balanced force is required to accelerate the body.
Statement 3: An object moves with a uniform velocity when balanced forces are acting on it or if there is no net force acting on it.
Statement 4: Balanced force cannot bring an object at rest to motion.

1. Only statement 1

2. Statements 1, 3 and 4

3. Only statement 2

4. Statements 1, 2 and 3

Q.

What are equal and opposite forces acting on a body which do not change its state of rest or uniform motion called?

1. Balanced Forces

2. Unbalanced forces

3. None of the above

4. Parallel forces

Q.

A body is imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then

1. The body may necessarily change direction

2. The body is sure to slow down

3. The body will necessarily continue to move in the same direction at the same speed

4. None

Q.

A force of 20 N acts on a body of mass 4 kg for 5 s when it is initially at rest. Calculate the velocity acquired by the body and change in momentum of the body. [3 MARKS]

Q.

What is the effect of force when spring is compressed?

Q.

Two force of $12N$ and $8N$ act upon a body. The resultant force on the body has a maximum value of

1. $4N$

2. $0N$

3. $20N$

4. $8N$

Q.

When a horse exerts a force on cart , the cart exerts an equal and opposite force on the horse. Then how come the horse can manage to pull the cart ?

Q. In a tug of war, two teams are pulling a rope, but still the rope is not moving either side. So the forces are:

1. Unbalanced forces
2. Balanced forces
3. Gravitational forces
4. Electrostatic forces

Q.

When a sailboat moves with the force of wind, the kind of force acting on the sail boat is :

1. Gravitational force

2. Frictional force

3. Mechanical force

4. Electric force

Q.

There is some water in the beaker placed on the pan of a spring balance. If we dip our finger in the water without touching the bottom of the beaker, then how does the reading of spring balance change?

1. The reading decreases

2. The reading increases twice

3. The reading remains unaffected

4. The reading increases

Q.

Two spring balances pull each other in opposite directions. If the reading of one spring balance is 2 N, the reading shown by the second spring balance will be:

1. 3.5 N

2. 2.0 N

3. 3.0 N

4. 2.5 N

Q.

A number of forces acting on a body do not cause any change in its state of rest or of uniform motion. The forces are:

1. Unbalanced

2. Inclined

3. Balanced

4. Parallel

Q.

Two spring balances hooked and pull each other in opposite directions. If the reading of one spring balance is 2 N, the reading shown by the second spring balance will be:

1. 4.0N

2. 2.0N

3. 3.0N

4. 2.5N

Q. The vector sum of all the individual forces acting on a body is defined as the net force.

1. True
2. False

Q.

The force of friction between the surface of a floor and the surface of the box in contact with the floor is 500N. How much minimum force has to be applied on the box in order to move the box on the floor with constant velocity?

1. 100 N

2. 500 N

3. 50 N

4. 1000 N

Q. Which among the following is a self-adjusting force?

1. Rolling friction
2. Kinetic friction
3. Static friction
4. All of these

Q. Situation: A ball is moving down a slope with a steady speed. If it is moving with steady speed then the forces acting on the ball are balanced.
Question: Now if the force is balanced then there should be no net movement by the ball then why the ball is moving?

Q.

Forces acting on body are said to be balanced if.

1. Sum of forces is zero.

2. Direction of forces is the same.

3. Magnitude and direction of force is same.

4. Gravitational force acts on it.

Q.

Jaikishan and Arun are pushing each other as shown in the given figure. Jaikishan’s push is weaker than that of Arun. As a result, they move in the direction shown in the figure.

Jaikishan and Arun move in the given direction because of:

1. Tension force

2. Unbalanced force

3. Gravitational force

4. Balanced force

Q. A ball is moving over a horizontal smooth surface with a constant velocity. What type of forces are acting on the ball?