Forces and Motion

Question 1

What is force?

Answer 1

Force is an external cause that the body experiences as a result of interacting with another body. It is a push or pull effect.

Question 2

What is effect does the result of a force have on

Answer 2

Force can cause an object to either change its state, direction or its acceleration.

Question 3

Is force scalar or vector?

Answer 3

Vector as it has both magnitude and direction.

Question 4

What is the condition for a force to be created?

Answer 4

Two or more things interacting with each other.

Question 5

What is the unit of force

Answer 5

Newton

Question 6

What is a Newton?

Answer 6

1 Newton force is the force required to accelerate a mass of 1kg by 1m/s in the direction of applied force.

Question 7

What is the CGS system?

Answer 7

Centimeter-gram-second unit system

Question 8

What is the unit of force in the CGS system?

Answer 8

Dyne

Question 9

What is the dimensional formula of force?

Answer 9

ML𝑇^2

Question 10

What effects do force have on an object?

Answer 10

Force can Change the Shape and Size of an Object
Force can Change the direction of an Object
Force can Change the Speed of an Object
Force can change the state of Rest or Motion of an Object

Question 11

What is the formula for force?

Answer 11

Force is defined by the product of the mass and acceleration of the object. For a body with mass “m” and the acceleration “a” the force can be calculated as F=ma

Question 12

How is resultant force calculated?

Answer 12

When two individuals apply force in the same direction, the resultant is the sum of two forces.

When force is applied in the opposite directions, the resultant is subtracted.

Question 13

What does the magnitude of a force express?

Answer 13

Its strength

Question 14

When are forces said to be balanced?

Answer 14

When forces are equal and opposite to each other, they can be said to be balanced as the resultant force is zero.

Question 15

What are two different categories of forces.

Answer 15

Contact and non-contact forces

Question 16

What are contact forces?

Answer 16

These are forces that act when an item comes into physical touch with them, i.e muscular forces, friction forces, spring forces

Question 17

What are Non-contact forces?

Answer 17

These are forces which can act without coming into physical touch with an item i.e gravitational, electromagnetic, electrostatics etc

Question 18

What is a muscular force?

Answer 18

Muscular force is a contact force in which force is exerted by the muscles of the body.
For example, jumping, kicking, running, walking, climbing, lifting, and pushing all are exerted by our muscles.

Question 19

What is frictional force?

Answer 19

Frictional Force is a contact force that always opposes the body’s state of motion over another body.

For example, if we stop paddling a bicycle, gradually it gets slows down and stops after covering some distance.

Question 20

What is magnetic force?

Answer 20

Magnetic force is a non-contact force exerted by a magnet on any other magnetic substance. For example, if we bring a magnet near an iron nail then the magnet pulls them towards it since magnets exert force.

Question 21

What is electrostatic force?

Answer 21

An electrostatic force is a non-contact force that can be exerted by a charged object on another object from a distance. For example, when a plastic comb is rubbed in dry hair, then the electrically charged comb attracts a tiny piece of papers

Question 22

What is gravitational force?

Answer 22

The Gravitational force is a non-contact force between two bodies having some mass. It is an attractive force. The force of attraction between the earth and any object is called the force of gravity.

Question 23

What did galileo use experiments to demonstrate?

Answer 23

Galileo used experiments to demonstrate that when there is no external force acting on an object, it moves at a constant speed.

He could observe that a sphere’s speed rises as it rolls down an inclined plane because of its gravitational attraction on it.

Question 24

What is the line of action of a force?

Answer 24

The line of action of a force is the path it takes as it exerts its force on an object.

Question 25

What is the point of application of a force?

Answer 25

the location where it is exerting its force on an object.

Question 26

What is the force of friction?

Answer 26

The force of friction is the force that opposes the relative motion between the surfaces of two objects in contact and acts along the surfaces

Question 27

When is the net force of an object 0?

Answer 27

when all the forces are equal and balanced.

When the body is at rest or constant velocity.

A net force acting on a body, however, can change either the magnitude or the direction of its velocity if all of the forces acting on it result in an unbalanced force, which indicates that the unbalanced force can accelerate the body.
For instance, when a body is exposed to a number of forces and is determined to be at rest, we can conclude that there is zero net force operating on the body.

Question 28

What is newtons’s first law of motion?

Answer 28

A body in the state of rest stays at rest and a body in the state of uniform motion stays at uniform motion until and unless a net external force is applied

we can say that an object which is at rest will continue to stay at rest and an object which is in uniform motion continues to stay in uniform motion until an external force is applied. The first law of motion is also called as Law of Inertia.

Question 29

What is inertia?

Answer 29

The natural tendency of an object to resist a change in its state of rest or in its state of uniform motion is called Inertia.

Question 30

What are the two conditions of newton’s first laws?

Answer 30

For Objects at Rest: If an object is at rest, i.e. there, velocity and acceleration are zero. The object will remain at rest until an external force is applied.
For Objects in Motion: If an object is in a state of uniform motion, i.e. it has an initial velocity. The object will remain in a state of uniform motion until an external force is applied.

Question 31

What is a balanced force?

Answer 31

The force is said to be balanced forces if they nullify one another and their resultant force is equivalent to zero.

Question 32

What is an unbalanced force?

Answer 32

When two opposite forces acting on a body, move a body in the direction of the greater force or forces which bring a motion in a body are called unbalanced forces.

Question 33

Examples of newton’s first law?

Answer 33

A roller coaster uses the principle of inertia. It continues to move in the same direction at a constant speed until the tracks act as an external force that changes its direction.

If you slide a hockey puck on ice, eventually it will stop. This is because of friction on the ice or if it hits something, like a player’s stick or a goalpost.

A book lying on the table remains at rest as long as no net force acts on it.

A marathon runner continues to run several meters beyond the finish line due to inertia.

If pulled quickly, a tablecloth can be removed from underneath the dishes. The dishes remain still unless the friction from the movement of the tablecloth is not too high in magnitude.

Men in space find it more difficult to stop moving because of a lack of gravity acting against them.

Question 34

What is acceleration?

Answer 34

Change of velocity per unit time

Question 35

What is uniform acceleration?

Answer 35

Where the velocity of an object moving along a straight line changes at a constant rate