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physics final exam grade 9 > lesson 3 > Flashcards

lesson 3 Flashcards

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1
Q

State the effects of force

A

1)It can change the state of rest or motion of the body it can produce motion.

2)It can change the shape and size of the body

3)increase or decrease momentum of a body

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2
Q

Name the 2 kinds of forces and explain each

A

Contact force: These forces are forces applied on a body by physical contact
Non contact forces: these forces are forces acting a body without being in contact with them meaning there is a distance between object applying the force and object being acted upon

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3
Q

Name the different contact forces

A

Different contact forces are: Frictional force, Normal reaction force, Tensional force, force by a spring, force by collision of 2 bodies]

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4
Q

Name the different non contact forces

A

Different non contact forces are: gravitational force, electrostatic force, magnetic force.

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5
Q

What is frictional force

A

Force acting in the opposite direction of the applied force by the surface in contact with the body

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6
Q

What is normal reaction force

A

Force acting on a body normal to the surface on which the body is kept on which is equal to the force applied by a body when kept on a surface.

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7
Q

Tensional force

A

A force develops in a string when a body is attached to the string which acts opposite to the direction of force applied by the body. this force which pulls the body upwards and balances out the weight of the body is called tensional force

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8
Q

what is restoring power

A

the capability of a spring to return to its original shape or form when force is removed. this is the force acting opposite to the force acting on the spring its magnitude is directly proportional to the magnitude of displacement

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9
Q

What is force of action

A

When a body collides 2 forces acts on the bodies, the body which collided with other applies a force called force of action

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10
Q

What is force of reaction

A

The body when acted upon by force of action applies a opposite force at the same instant this force is called force of reaction

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11
Q

what is gravitational force

A

In this universe particles attract each other due to their mass, this force of attraction is called gravitational force

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12
Q

what is weight

A

The force on a body by force of attraction of earth is called force of gravity

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13
Q

What is electrostatic force

A

like and unlike charges attract each other this force of attraction is called electro static force

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14
Q

What is magnetic force

A

Like poles and unlike poles attract each other this force of attraction is called magnetic attraction

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15
Q

What is the general character of non contact forces

A

The magnitude of these forces depend on the distance of seperation between them, if seperation decreases then the magnotude of these forces increases

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16
Q

what did scientist believe before Galelio and what did he prove

A

Before Galelio people believed that the body remains in state of rest until a force acts on it and it remains in state of motion if there is a force acting on it and if the force is removed then the object doesent stay in motion. Galileo proved that body stays in state of rest if its in state of rest and remains in state of motion if its in state of motion unless a opposite force acts on it.

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17
Q

What does newtons first law state

A

A body remains in state of rest if its in state of rest and the body remains in state of motion if its in state of motion in the same direction and speed until a external force acts upon the body

18
Q

what is inertia

A

Tendency of a body to retain its state of rest or state of motion

19
Q

What is force

A

Force is a external cause tends to change state of rest or state of motion

20
Q

The greater the mass _______ the inertia

A

Greater

21
Q

what are the two types of inertia

A

Inertia of rest: a body remains in state of rest until a external force acts on it
inertia of motion: a body remains in state of motion until a external force acts on it

22
Q

Give a example of inertia of rest

A

When a train is in motion and suddenly stops: the feet of people are in contact to the train so when the train stops and upper part of out body which is not in contact remains in state of motion while our lower part of the body which is in contact stops with the train thus due to inertia we jerk forward

hanging carpet being hit with stick causes the dirt to come out: when the carpet is hit there is a change in its state of rest, the carpet changed to state of motion while the dust particle remains in state of rest due to inertia thus the dust particles get removed

23
Q

Give examples of inertia of motion

A

When a cyclists stops pedaling the body does not come to a stop the cycle keeps moving until retardation causes it to stop

when a person jumps out of the train lower part of the body comes in contact with the ground and comes to stop while the upper part of the body remains in motion which causes him to fall

24
Q

what does force to stop a body depend on

A

When two bodies are in motion the force to stop the body depends on the mass and velocity

25
Q

What is linear momentum of the body

A

The linear momentum of a body is its product of mass and velocity

26
Q

when a force acts on a body change in rate of momentum depends on

A

It is equal to mass times acceleration in the body due to t he force considering the mass remains same

27
Q

acceleration in a body is directly proportional to

A

force applied and mass

28
Q

What is K in F = Kma

A

K is a constant its value is so chosen that K is equal to 1 when m= 1 a= 1

29
Q

What is one newton

A

One newton is the force when acts on a body of mass 1kg causes a acceleration of 1m/s-2

30
Q

What is one dyne

A

one dyne is the force which when acts on a body of 1g produces a acceleration of 1cm/2-3

31
Q

What is newtons second law of motion

A

The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied

32
Q

What is newtons second law of motion

A

The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied

33
Q

What is newtons second law of motion

A

The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied

34
Q

What is newtons second law of motion

A

The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied

35
Q

What is newtons second law of motion

A

The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied

36
Q

What is newtons second law of motion

A

The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied

37
Q

What is newtons second law of motion

A

The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied

38
Q

What is newtons second law of motion

A

The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied

39
Q

what is newtons third law of motion

A

It states that for every action there is a equal and opposite reaction

40
Q

the force of attraction depends on

A

It directly depends on mass of the body and inversely proportional to square of distance between them

41
Q

What is universal gravitational constant

A

In the equation F = Gm1m2/r^2 G is constant no matter what the medium is, particle or temperature therefore G is the universal gravitational constant

physics final exam grade 9 (1 decks)

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