Work Review

Work Review

Multiple Choice

Work is measured in terms of

• Joules

• kg

• N

• m/s

Work

The energy transfer of an object in terms of force and displacement

Measured in Joules

Work Angles

• Force and Displacement are along the same axis in the same direction W=Fd

• Force and Displacement are opposite W=Fd(cos 180^o)

• If Force and Displacement are perpindicular to one another then W=0

Multiple Choice

Who is doing Work

• man

• boxes

Multiple Choice

The Work of the box is

• +

• -

• 0

Inclined Plane

• F _parallel = sliding force due to gravity

• F_f = force of friction (opp of direction)

• F_a= applied Force

• W_net= W_Fp +/- W_Ff +/- W_Fa

Multiple Choice

A 50 Kg box is sliding down a hill with a 2.4 N frictional force at an incline of 37^o. The box travels 9m before coming to a rest. What is the net Work done on the box?

• 2655 J

• 21.6 J

• 2633 J

• 26.3 J

Kinetic Energy

• Energy in motion

• KE=1/2mv²

Work

• The change in KE

•  $\Delta KE=\frac{1}{2}m_fv_f^2\ -\ \frac{1}{2}m_iv_i^2$