Work, Power, Energy Unit Review

Work

100

Unit of Work, which is a transfer of energy 

What is Joules? (J)

200

Product of Force and Displacement in the direction of the Force

What is Work?

300

Work done by force of gravity when 25 N object falls a distance of 3.5 m

What is 88 J?

400

The work that boat does on the water skier over 12 seconds when a water skier, moving at a speed of 9.30 m/s, is being pulled by a tow rope that makes an angle of 37.0° with respect to the velocity of the boat. The skier is moving in the same direction as the boat. The tension in the tow rope is 135 N.

What is 1.20 x 10⁴ J

Power

100

Rate of Doing Work

W/t

What is Power?

200

Unit of Power

What is Watt (W)?

Machines

100

Ratio between output(resistance) Force and input(effort) Force

F_o/F_i

What is Mechanical Advantage? (MA)

200

Ratio between input distance over output distance
d_i/d_o 

What is Idea Mechanical Advantage (IMA)?

300

Force (parallel) required to slide 25kg box to the top of the ramp which is 18m long and 4.5m high

What is F = 61 N?

Energy

100

Kinetic Energy and momentum is conserved

What is elastic collision?

200

In a closed, isolated system, the total energy does not change.

What is Conservation of Energy?

300

Location at which potential energy is chosen to be zero

What is reference level?

400

Kinetic Energy of a 5.00 g bullet travelling at 370 m/s

What is 3.42 x 10² J?

500

Final velocity of the interlocked cars sliding forward after a compact car 575 kg moving at +15m/s rear ends another car 1575 kg, originally  moving at +5m/s. (Assume no friction)

What is 7.7m/s ?

Energy 2

100

Momentum is always conserved

What happens when a collision occurs?

200

Kinetic Energy is converted to another form of energy, but momentum is conserved.

What is inelastic collision?

300

Potential Energy of 640 N person climbing up to a height of 5.0 m

What is 3.2 x 10^3 J?

500

(Continuation from Energy 1)

Kinetic Energy difference in the collision

What is -2.1 x 10⁴ J?