Help please Please read each question and the options carefully, select the best response or write your short answer.

1. What name is given to this principle?

A conservation of mass

B energy principle

C mass-energy theorem

D conservation of energy

2. Mechanical work done on a falling object causes what energy transformation?

A from kinetic energy to gravitational potential energy from thermal energy to gravitational potential energy

B

C D from gravitational potential energy to kinetic energy from gravitational potential energy to thermal energy

3. Which option gives the correct information for a falling object?

A maximum kinetic energy and maximum gravitational

potential energy is achieved at the same time

when kinetic energy is maximum, gravitational

B

potential energy is minimum minimum kinetic energy and minimum gravitational C

potential energy is achieved at the same time when kinetic energy is minimum, gravitational D

potential energy is minimum

4. Which equation is used by the light gate (photogate) to calculate the speed?

A 5 cm / elapsed time

B 5 m/ elapsed time

C D elapsed time / 5 cm elapsed time / 5 m

5. The main reason we repeat our measurements is

to decrease the reliability

ABCD to increase the precision

to increase the reliability

D to decrease the precision