Work
Lever
Pulley
Wheel and Axle
Lab Report
100
What instrument would be used to measure force?
Spring scale
100
What class(es) of lever always increase output distance and speed?
Class 3
100
When a single fixed pulley is used to lift a load and the effort is 30N, what is the effort required to lift it using a single movable pulley system?
15 N
100
What are two ways the wheel and axle makes work easier when MA is greater than or less than one?
Multiplies effort force/increases load speed and distance.
100
I am section of lab report where you would explain your findings.
Discussion
200
Who does more work - a man who lifts a large box from the ground up into the back of a truck, or a man who puts the same box on a trolley and wheels it up a ramp into the truck?
They do the same amount of work.
200
What class(es) of lever increase my force, so I can move a load with less effort?
1st and 2nd with fulcrum nearer the load.
200
Which pulley system provides only a directional advantage?
Single fixed pulley
200
It takes four athletes to turn the wheel below. How many barbarians would it take if the wheel radius were doubled and the axle radius stayed the same?
2 -- The greater the radius of the wheel, the less effort it takes to turn the wheel. If the wheel radius were doubled, it would take half as many barbarians to turn the wheel.
200
Rob is in charge of waxing the floor at the local mall. He wants to test a new brand of floor wax called Squeaky Clean. Rob waxes 20 floor tiles with Squeaky Clean and 20 tiles with the original wax brand. After one week he counts the number of scratches on the floor. What is the DV?
Number of scratches.
300
What is the relationship between Work, Force, and Distance?
Work is the what you get when a force acts over a certain distance. Object is moving in the same direction as the force.
300
The turkey weighs 100 N. If the strongman pushes on the lever at position 1, what is the smallest effort that he would need to lift the turkey?
Just over 100N
300
What is the direction of pull in a single movable pulley?
Up
300
A group of people are trying to turn a large wheel and axle to grind grain. What can they do to move the wheel with less effort? (2 things)
Increase radius of wheel/decrease radius of axle
300
Shannon wants to see if the amount of time she studies will affect her grades. She normally studies for 30 minutes a night, but decides to double her study time to one hour per night. Over the next three weeks Shannon sees her science grade raise 10%. What is the IV?
amount of time spent studying
400
If you exert a force of 80 Kg, and the object moves 10 meters how much work did you do?
8000J
400
With what force must the lever arm be pushed down to raise the rock?
13.3 N
400
Let's say you had a pulley system with a mechanical advantage of 3. If you want to lift a boulder 10 meters off the ground, how far would you have to pull the rope?
30 m
400
What is the IMA of a wheel and axle system when force is applied to the axle?
Less than one
400
Rebecca wants to see if her kitten prefers new chicken flavored treats over her usual beef flavored treats. She puts 10 chicken treats in one bowl and 10 beef flavored treats in another bowl. She sees how many of each treat her kitten eats and repeats the experiment for 3 days. What is DV?
Number of each type of treat eaten
500
How much work is required to pull a sled 5 meters if you use 60 kg of force?
3000 J
500
A lever is used to raised a 12 kilograms mass with a effort that is only 4 kilograms. What is the mechanical advantage ?
3
500
How can the efficiency of a machine be increased?
Reducing the amount of friction in a machine
500
A wheel has a diameter of 27 cm and an axle radius of 4.5 cm. What is the IMA of the wheel and axle?
3
500
Two different cars are traveling at 60 mph. At a certain point, both cars slam on the brakes. The distance it takes for each car to stop is then measured. What is IV and DV?
IV -- type of car
DV -- breaking distance