Unit 5- Work, Energy, Power, Momentum, Impluse

What is Work?

What is the formula?

what are its Units?

Is it a Scalar or a Vector?

• Work is how much energy (J) is applied to something

• W = Fd

• The Units for work is Joules (J) cus Fd = Nm

• Work is a SCALAR

How can you tell if no work is done?

If the displacement is 0 (lifting something up and bringing it back down to initial point)

What are the 3 conditions for Work?

1. A force must be exerted on an object (F)

2. The object must be displaced by the force (Δd)

3. At least part of the force must be in the same direction as displacement

What is Work Proportional to?

Work is basically proportional to the two Units in its formula:

W = FD

W is proportional to F (force)

W is proportional to D (displacement)

Who do you calculate Work for when something is pulled at an angle?

Basically find the horizontal (x-axis) Force/movement of the pulled object

—> Will depend if it is Force or Displacement based on the Q

Name all metric conversion prefixes and symbols from 10^1 to 10^12(yes you need to go that high)

*WHAT ARE THE SYMBOLS FOR EACH???*

10^1 = deca (da) - remember this

10^2 = hecto (h)

10^3 = kilo (k)

10^6 = mega (M) - becomes a capital letter

10^9 = giga (G) - becomes a capital letter

10^12 = tera (T) - becomes a capital letter

Note: all units from 10^3 to 10^12 follow computer storage (kilobyte, megabyte, gigabyte, terabyte)

Name all metric conversion prefixes and symbols from 10^ -1 to 10^ -12

*WHAT ARE THE SYMBOLS FOR EACH???*

10^ -1 = deci (d)

10^ -2 = centi (c)

10^ -3 = mili (m)

10^ -6 = micro (μ)

10^ -9 = nano (n) - haha like ipod na-no

10^ -12 = pico (p)

What is Momentum?

What is the formula?

what are its Units (what MUST you not forget)?

Is it a Scalar or a Vector?

• Momentum a quantity of movement of smth

• P = mv, yes P is used to rep Momentum

• the Unit is kg x m/s

  • DO NOT mistake this for accelerate and write N

• Momentum is a VECTOR

What is Impulse?

What is the formula?

what are its Units?

Is it a Scalar or a Vector?

• Impulse is the change in Momentum (ΔP)

• impulse is ΔP = P_f - P _i

• The units are kg x M/s (same as Momentum)

• Impulse is a VECTOR (will be in same direction as Force given in the Q)