Calculating Work and Power
Joel does 12 J of work in 2 seconds as he lifts a box off of the floor. How much power does Joel use on the box?
What is 6 W?
What is work?
Pg 87
A ramp, or inclined plane, is a flat, sloped surface.
What is Inclined Planes?
Pg 107
The fulcrum is between the input force and the output force.
What is a first class lever?
Pg 104
Squeezing the handles of a pair of scissors.
What is Input work to Output work?
Pg 96
Sasha does 15 J of work in 4 seconds as she lift a chair off the floor. How much power does Sasha use on the chair?
What is 3.75 W?
What is force?
Pg 87
Is an axle attached to the center of a wheel and both rotate together.
What is Wheel and Axle?
Pg 106
Has output force between the input force and the fulcrum.
What is a second class lever?
Pg 104
Hitting a nail with a hammer.
What is Input force to Output force?
Pg 96
A student pushes a box across the floor, using 9 W of power in 6 seconds. How much work does the student do?
The rate at which work is done.
What is power?
Pg 91
The point about which a lever pivots.
What is fulcrum?
Pg 104
The input force is between the output force and the fulcrum.
What is a third class lever?
Pg 104
The ratio of a machine's output force produced to the input force applied.
what is mechanical advantage?
Pg 99
Eli lifts his little brother 1.0 m off the ground using a constant force of 15.5 N. How much work does Eli do?
What is 15.5 J?
Lifting your backpack.
What is upward force?
Pg 90
A sloped surface that moves.
What is a wedge?
Pg 108
The part of your body that holds the head that acts like a first class lever.
What is the neck?
Pg 106
A machine is the ratio of the output work to the input work.
Pg 99
Mary applies a constant force of 25 N as she pushes a desk. In total, she does 75 J of work. How far does she push the desk?
What is 3 M?
Pulling a wheeled suitcase.
What is force at an Angle?
Pg 89
A inclined plane wrapped around a cylinder.
What is a screw?
Pg 108
The part of body that you pick up things with that acts like a third class lever.
What is a Arm?
Pg 106
Riding a bike to school.
What is a machine?
Pg 95