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Physics F3 > Forces > Flashcards

Forces Flashcards

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1
Q

What is a force?

A

A force is a push or a pull.

It is a vector quantity.

It is measured in Newtons.

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2
Q

What are forces represented by?

A

Forces are represented using an arrow.

The length of the arrow represents the size of the force, and the arrowhead represents the direction.

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3
Q

A longer arrow represents a…

A

larger force

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4
Q

A shorter arrow represents a…

A

smaller force

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5
Q

What are the two types of forces?

A

Non-contact forces and Contact Forces

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6
Q

What are Contact Forces?

A

Contact forces need a physical contact to get created.

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7
Q

What are examples of contact forces?

A

Friction, Tension, Normal Reaction Force, Upthrust (Buoyancy Force), Thrust.

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8
Q

What are non-contact forces?

A

Non-contact forces get created due to fields (magnetic, electronic, gravitational).

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9
Q

What are examples of non-contact forces?

A

Weight (Gravitational Force)
Magnetic Force
Electrostatic Force

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10
Q

What’s normal reaction force?

A

When we keep an object on a surface, the weight of the object presses the surface down. The surface is giving a reaction on to the object according to Newton’s 3rd law.

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11
Q

What is Newton’s third law?

A

For every action (force) in nature, there is an equal and opposite reaction.

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12
Q

What is point of action?

A

Point of action of a force is from a point at the bottom of an object which is in contact with the surface.

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13
Q

Normal reaction should always be marked…

A

perpendicular to the surface.

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14
Q

What is friction?

A

Friction always opposes the motion. Frictional force always creates heat energy.

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15
Q

Friction is marked along…

A

the surfaces which are in contact.

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16
Q

Friction also gets created when…

A

an object is moving inside a fluid (liquid/gas)

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17
Q

Friction inside fluids is also known as…

A

drag force/air resistance/ water resistance/viscous force

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18
Q

What are examples of friction in fluids?

A

When a hot air balloon is acting up, so the air resistance is acting down.

When a parachutist is falling down, so the air resistance is acting up.

19
Q

What is tension?

A

Tension gets created when the object is being stretched. Tension acts inwards from the two ends of the object. It’s like a rope is pulling back the person who is pulling it.

20
Q

What is upthrust?

A

Upthrust acts upwards on an object that is fully/partially immersed in a fluid (gas or liquid).

21
Q

What is buoyancy point?

A

The point from which the upthrust is acting.

22
Q

Upthrust always acts…

A

vertically upwards.

23
Q

What is weight/gravitational force?

A

Weight is the force acting on an object due to gravity. Weight depends on gravitational field strength.

24
Q

Gravitational field strength…

A

is different on different planets. Higher the mass of the planet, higher the field strength.

25
Q

Gravitational field strength is also known as what?

A

Gravitational acceleration?

26
Q

What is the centre of gravity?

A

Weight always acts from the point known as the centre of gravity.

27
Q

Weight always acts in which direction?

A

Vertically down.

28
Q

What’s the equation for Weight?

A

Weight = Mass * Gravitational Field Strength

W = m * g

29
Q

What are the effects of forces on objects?

A

A force can change the speed, direction and the shape of an object.

30
Q

What is a resultant force?

A

A single force which can give the same effect as several forces added together.

31
Q

What is a balanced force?

A

If the resultant force on an object is 0, the object is said to be balanced.

32
Q

What should two forces have to be balanced?

A

The same magnitude, should act in opposite directions, and same line of action.

33
Q

What are unbalanced forces?

A

If there is a value for the resultant force, the forces are unbalanced. The amount of unbalanced force is equal to the resultant force.

34
Q

What is Newton’s First Law?

A

When the forces on an object are balanced, the object will remain at rest or move with a constant velocity along a straight line.

35
Q

What does Newton’s first law reveal?

A

It reveals that there are two situations when the forces on an object are balanced:

-When they are at rest/stationary

-When they are moving at a constant velocity.

36
Q

Unbalanced forces acting on an object cause it to…

A

accelerate/decelerate

This means that the velocity of the object changes with time.

37
Q

What is Newton’s 2nd Law?

A

Newton’s second law states that the acceleration of an object is directly related to the net force and inversely related to its mass

Therefore: f = m * a

38
Q

The magnitude of the object’s acceleration is …… to the magnitude of the resultant force.

A

directly proportional

39
Q

The magnitude of the object’s acceleration is …. to the mass of the object.

A

inversely proportional

40
Q

Resultant force is measured in what?

A

Newtons (N)

41
Q

Acceleration is measured in?

A

m/s^2

42
Q

Mass is measured in…

A

kilograms

43
Q

What’s the difference between mass and weight?

A

Mass is the amount of matter an object contains while weight is the force acting downwards on an object due to gravity.

Physics F3 (2 decks)

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