43 nencs TEST CHPS. 10&11 TRUE/FALSE ta an object is not in the direction the ob

Question

43 nencs TEST CHPS. 10&11 TRUE/FALSE ta an object is not in the direction the object is moving, the work multiplying the force tmes the cosine of the angle of the force times the distance moved. 2. The mechanical advantage of a machine is always greater than 1. 3. Machines decrease the amount of work done in performing a task 4. An ideal machine has an efficiency of 100%, therefore its work 5. If a lever has a mechanical advantage of 4.0, the lever m 6. Energy cannot be changed from one form to another 7. Mechanical energy is the difference between kinetic energy and gravitational potential energy output equals work input. multiplies the effort force 2.0 times in a system. 8. Elastic potential energy is associated with an object's height above the gr ound or some other reference level. 9. An inelastic collision is one in which the total amount of kinetic energy after the collision is greater than the total amount of kinetic energy before the collision. 10. According to Einstein, mass can be converted to energy PROBLEMS. SHOW ALL WORK ROUND ANSWERS TO THE PROPER NUMBER OF SIGNIFICANT FIGURES 11. Alle exerts a force of 186 N on a lever to raise a 2.70 x 10° N object to a height of 29.0 cm. hf the efficiency of the lever is 83.3%, how far does Alie move her end of the lever? 12. You pull your dog on a sled through the snow. You pull on the rope at an angle of 27 from the horizontal and exert a force of 75 N on the rope. The sled move horizontally a distance of 950 m. How much work did you do on the rope? 13. A 1600 kg car moves with a velocity of 19.5 m/s. Calculate the power required to reduce the velocity to 3.20 m/s in 11.0 seconds.

Explanation / Answer

1) True

2) False

MA can be greater than, less than or equal to 1.

3) False

4) True

5) False

It multiplies 4 times.

6) False

Energy can be changed from one form to another.

7) False

It is the sum, not the difference.

8) False

The description is for gravitational PE. Elastic PE depends on the
amount of stretching.

9) False

The final KE is lesser than the initial KE.

10) True

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