Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

Username is available taken
show password

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Gr 8 Unit B

Mechanical System Chapter 5

What are the 3 types of levers? Class 1:Fulcrum is in the middle. Class 2: Output is in the middle. Class 3: Input is in the middle.
How do you find the efficiency percentage? Wout/Win x 100% =mass in J/the amount of work used in J =decimal =to percent
How do you calculate the Mechanical Advantage of a simple machine? is output force/input force (output Divided by input)
What are the 6 simple machines? Wedge, Screw, Inclined Plane, Lever, Pulley, Wheel and Axle
How do you increase the efficiency of a simple machine? When you use a pulley, you may hear the pulley squeak sound energy and it may become warm heat, this is the work done by friction. If you reduce the frictional force, you increase the efficiency of a machine. To reduce friction is to add grease or oil.
How do you calculate ideal mechanical advantage for an inclined plane? Length of Ramp/Height of Ramp (Length of Ramp Divided by Height of Ramp)
Why is the output work of a simple machine always less than the input work? The output work is always less than the input work because some of the energy put into using the machine converts into other forms of energy, such as heat, due to friction.
How do you calculate the ideal mechanical advantage of a pulley? The ideal mechanical advantage of a pulley is the amount of support ropes that are being pulled in the opposite direction of the pulley system.
How do you calculate the ideal mechanical advantage when the load is attached to the wheel? radius of wheel/radius of axle
How do you calculate the ideal mechanical advantage when the load is attached to the axle? radius of axle/radius of wheel
How do you calculate the ideal mechanical advantage of a lever? length of the input arm/length of output arm
What is a simple machine? A simple machine is a machine that requires the application of a single force to do work.
What is a mechanism? A mechanism is made up of several different types of machines that work together to perform a specific function.
What is a perpetual motion machine? A perpetual motion machine is a machine that can run forever, however scientists have never invented one that is successful.
What are two examples of a pulley? A elevator, a well, and a flagpole.
What are two examples of a wheel and axle? A door knob, a hose tap, and a bike.
What are two examples of a inclined plane? A wheelchair ramp, a slide, and stairs.
What are examples of a class 1 lever? A seesaw, a pair of scissors, and pliers.
What are examples of a class 2 lever? A wheelbarrow, and a nutcracker.
What are examples of a class 3 lever? A stapler, tweezers, a broom, and a hockey stick.
What are examples of a wedge? A shovel, a knife, and a axe.
What are examples of a screw? A bottle cap, light bulb, and a screw driver.
What is a machine? A machine is a mechanical system that reduces the force required to accomplish work.
What is the input force? The force that is applied to the machine.
What is the output force? The force that the machine applies to the object.
What is the mechanical advantage? The amount by which a machine can multiply an input force.
What is the ideal mechanical advantage? The mechanical advantage of a machine that has no friction.
What is the useful output work? The work a machine is designed to perform.
What is the input? The effort.
What is the output? The load.
What is a fulcrum? The point that does not move.
What is efficiency? The efficiency of a machine is measures in useful work done by the machine compared to the work needed to operate it.
Created by: eforster0592
Popular Science sets




Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
restart all cards