P 8 Flashcards

1
Q

What is a scalar quantity ?

A

Scalars are quantities that only have magnitude .

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2
Q

What is a vector quantity ?

A

Vectors have both magnitude and direction

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3
Q

What are the 8 examples of scalar quantities ?

A

Distance
Speed
Mass
Energy
Volume
Density
Temprature
Power

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4
Q

What are 6 examples of vector quantities ?

A

Displacement
Velocity
Weight
Force
Acceleration
Momentum

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5
Q

How can we represent a vector quantity ?

A

We can represent it by using an arrow

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6
Q

When representing a vector what does the length of the arrow represent ?

A

The magnitude of the vector

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7
Q

When representing a vector what does the direction of the arrow represent ?

A

The direction of the vector

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8
Q

What is a force ?

A

A force is a push or a pull that acts on an object .

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9
Q

What are the six main forces ?

A
  1. weight
  2. electrostatic
  3. thrust
  4. air resistance
  5. compression
  6. tension
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10
Q

What are the two types of forces ?

A

Contact and non contact forces

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11
Q

What is the unit for force ?

A

Newtons

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12
Q

What does Newtons third law state ?

A

When two objects interact with each other , the exert equal and opposite forces on each other .

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13
Q

How do you calculate weight ?

A

mass x acceleration due to gravitational field strength

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14
Q

What is an resultant force ?

A

A single force that describes all of the forces acting on an object .

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15
Q

What does newtons first law of motion state ?

A

If forces acting on an object are balanced , the resultant force is zero .

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16
Q

How can a resultant force be calculated ?

A

By adding or subtracting all of the forces acting on an object .

17
Q

What do you do when forces are working in opposite directions when working out resultant forces ?

A

They are subtracted from each other .

18
Q

When working out resultant forces , if their are forces working in the same direction what do you do ?

19
Q

What is tension ?

A

The force experienced by a cable , rope , or string when pulled , hung rotated or supported .

20
Q

What is friction ?

A

The force that arises when two surfaces are in contact of each other .

21
Q

What is the centre of mass of an object ?

A

The point at which its mass can be thought of as being concentrated .

22
Q

For a flat object that is symmetrical , where is its centre of mass ?

A

along the line of symmetry

23
Q

For irregular objects , what equipment do you need to find the centre of mass ?

A

A stand , plumbline , small weight and card .

24
Q

What is the method for an irregular object for the centre of mass ?

A
  1. Put a hole in one corner of the card and suspend the card from the rod .
  2. Use a plumb line to draw a vertical line on the card from the rod .
  3. Repeat the procedure , hanging the card from a different corner .
  4. Wherever the two lines cross , that is the line of symmetry .
25
Q

What does resolving a force mean ?

A

Finding perpendicular components that have resultant force that is equal to the force .

26
Q

8.5 parallelograms to answer a question about resultant forces .