CONCEPTUAL rnyana PRACTICE PAGE

Chapter 7 EnergyConservation of Energy

KE=O

1. Fill in the blanks for the six systems shown.

0- = 30 KM/h U = 60 kM/h

PE=OJ

PE=O=§vKE=503

Name . Date

CONCEPTUAL hySic PRACTICE PAGEChapter 7 EnergyWork and Energy

1. How much work (energy) is needed to lift an object that weighs 200 N to a height of 4 m?

ago :1 _

2. How much power is needed to lift the ZOO-N object to a height 0“ m in 4 a?

zoo N

3. What is the power output of an engine that does 60 000] ofwotk in 10 s?

000 W

4. The block of ice weighs 500 newtons.

a. How much force is needed to push it up the incline W = F' d = A5?

(neglect fn‘ction)?F'd = [Or-«A.

250 N F'(n=$'°v:{3

b. How much work is required to push it up the incline F ._. 2?

compared with lifting the block vertically S m?

5. All the ramps are S m high. We know that the 103 of the block at the bottom of the ramp will be

equal to the loss of PE (eonservation of energy). Find the epeed of the block at ground level in eachcase. E": El. .. A" “.0444 SOAL

Ian/w em" .1( all Lao

“H, 594 spud.

kg?! 25