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Physics > P3 > Flashcards

P3 Flashcards

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1
Q

What is the equation that links charge flow (Q), current (I) and time (F)

A

Q = I * T

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2
Q

What is the equation for volume?

A

Volume = length x width x height

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3
Q

What is meant by an object freely suspended

A

the object has returned to its equilibrium position after the turning force is taken away.

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4
Q

What are some examples of scalars?

A

Speed, temperature, distance, area, entropy and volume

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5
Q

What are examples of vectors?

A

Velocity, acceleration, displacement, force, momentum and drag

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6
Q

Define resultant force

A

The result of 2 vector forces acting against eachother

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7
Q

Equation for velocity

A

Velocity = speed + direction

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8
Q

Equation for clockwise movement

A

Total clockwise movement = total anticlockwise movement

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9
Q

How can a vector quantity be drawn and what does it show?

A

● As an arrow
● The length of the arrow represents the
magnitude
● The arrow points in the associated
direction

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10
Q

What is a force?

A

A push or pull acting on an object due to an interaction with another object.

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11
Q

What are the two categories that all forces can be split into?

A
  1. Contact forces (objects touching)
  2. Non-contact forces (objects separated)
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12
Q

Give three examples of contact forces.

A
  1. Friction
  2. Air resistance
  3. Tension
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13
Q

Give three examples of non-contact forces.

A
  1. Gravitational forces
  2. Electrostatic forces
  3. Magnetic forces
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14
Q

Is force a vector or a scalar quantity?

A

● Vector
● It has both a magnitude and an
associated direction

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15
Q

Give three examples of vector quantities.

A
  1. Velocity
  2. Displacement
  3. Force
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16
Q

Give three examples of scalar quantities.

A

● Temperature ● Time
● Mass
● Speed
● Distance ● Energy

17
Q

What is weight?

A

The force that acts on an object due to gravity and the object’s mass.

18
Q

What quantities does weight depend on?

A

Weight = mass x gravitational field strength

19
Q

What is the unit used for weight?

A

The Newton (N).

20
Q

What is the unit used for gravitational field strength?

A

N/kg

21
Q

What is meant by an object’s centre of mass?

A

The single point where an object’s weight can be considered to act through.

22
Q

What piece of equipment can be used to measure an objects weight?

A

A calibrated spring-balance or newton- meter.

23
Q

What is the name given to the single force that is equivalent to all the other forces acting on a given object?

A

The resultant force.

24
Q

If an object moves 3 metres to the left and then 3 metres back to its initial position, what is the object’s total displacement?

A

● The object has zero displacement
● Displacement is a vector quantity so it also
involves direction
● The object starts and ends at the same point

25
Q

State the equation linking distance, speed and time. Give appropriate units.

A

Distance = Speed x Time Distance (m), Speed (m/s), Time (s)

26
Q

Newton’s 3rd law

A

When 2 objects interact with eachother they exert equal and opposite forces on eachother

27
Q

Newton’s 2nd law

A

In order to make an object move from rest, the forces must be unequal

28
Q

What is inertia?

A

The tendency of an object to continue in its state of rest or uniform motion.

29
Q

What is an alternative name for the turning effect of a force?

A

A moment

30
Q

State the equation used to calculate the moment of a force. Give appropriate units.

A

Moment of force = Force x Distance Moment (Nm), Force (N), Distance (m)

31
Q

What distance measurement is used when calculating a moment?

A

The perpendicular distance from the pivot to the line of action of the force.

32
Q

If an object is in equilibrium, what can be said about the moments acting on the object?

A

The clockwise moments are equal to the anticlockwise moments.

33
Q

What three parts make up a lever system?

A
  1. Load 2. Effort 3. Pivot
34
Q

Give an example of when a lever may be used to multiply a force.

A

A wrench, which has a long handle so that the force applied by the user is multiplied.

35
Q

What determines the moment of a gear wheel?

A

The size of the wheel.

Physics (3 decks)

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