Mixed Review
Energy-Kinetic/Potential
Mechanical Energy
Work / Power
Machines / Efficiency
100

The rate at which work is being done is called ______.

Power

100

Name the Energy that is stored AND Give formula

Potential Energy (mgh)

100

The energy due to the positions of something or the movement of something

Mechanical Energy

100

Name the formula and unit used to measure work

W = F X D

Joules (J)

100

This transfers energy from one place to another or transforms it from one form to another

Machine

200

The product of the net force on an object and the distance through which the object moved is called _____.

Work

200

Name for Energy of motion AND give formula

Kinetic Energy (1/2 m v2)

200

True or False

Mechanical Energy is the total amount of kinetic and potential energy in a system

True

200

Name the formula and unit to measure power

P = w/t   

watts (w)

200
This a simple machine made of a bar that turns about a fixed point

Lever

300

The property of an object or system that enables it to do work 

Energy

300

You lift a 1.8 kg physics book 5m off the floor - calculate gravitational potential energy of the book

(1.8kg) (10 m/s2) (5m) = 90J

300

Calculate TME for a 50 kg skier moving at 2 m/s at the top of a 25m hill

12,600 J

300

Doing the same work over a longer amount of time increases / decreases  the power

decreases

300

__________________ of a machines is the ratio of output force to input force

mechanical advantage

400

Kinetic Energy depends on ______ & _______

mass & velocity

400
Calculate kinetic energy of a .5 kg baseball at a speed of 105 m/s

2756 J

400

Calculate TME of a drone with a mass of 18 kg is flying with a velocity of 10 m/s at a altitude of 17 meters

3960 J

400

A 300 N force is required to push a wagon 20 meters in 10 s.  Calculate how much work in being done

W= f x d

300 N x 20m  = 6000 J

400
A kind of lever that can be used to change the direction of force

Pulley

500

Gravitational Potential Energy depends on _______ & ________

weight & height

500

Energy cannot be created nor destroyed.  However, it can escape a system in the form of _______________

heat energy

500

Calculate TME of a 2 kg remote control car that is moving at a velocity of 7 m/s at it approaches the edge of a cliff that is 1,800 m high

36,049 J

500

You lift a heavy box with a force of 75N a distance of 2.3 m in 1.5 seconds.  Calculate power

F x d / t

75N (2.3m) / 1.5 sec = 115 W

500

Calculate the percent efficiency if a generator has an output of 5000 J  and an input of 5700 J when operating to a full load

87.7%

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