A drill bit is an example of which type of machine?
|D)||wheel and axle|
On what point does a lever pivot?
What is a sign that work is being done?
What happens to the amount of power expended when you are climbing stairs and then climb faster?
|B)||It stays the same.|
A ramp in a building is an example of which machine?
Name the four simple machines.
|A)||inclined plane, lever, wheel and axle, and pulley|
|B)||wedge, lever, pulley, and wheel|
|C)||plane, lever, screw, and wedge|
|D)||screw, lever, wedge, and plane|
What does a screw consist of?
|A)||a wheel and axle in a vertical position|
|B)||an inclined plane wrapped around a cylinder|
|C)||a wedge wrapped around a pipe|
|D)||a lever wrapped around a pole|
What is the mechanical advantage if 50 J are put in and 200 J are produced?
Using an inclined plane allows you to apply __________.
|B)||the same force|
|C)||a lesser force|
|D)||a greater force|
When you climb stairs and then walk down a hallway, in which direction is the work done?
|C)||along the hallway|
|D)||in the opposite direction that you walk|
Which of the following do you think a wheel and axle is most closely related to?
The efficiency of all machines is __________.
|A)||more than 100 percent|
|B)||exactly 100 percent|
|C)||impossible to calculate|
|D)||less than 100 percent|
Using several pulleys together is known as a __________.
|C)||wheel and axle|
What happens to the total amount of work done when you use a machine compared to not using a machine?
|A)||It stays the same.|
|B)||It goes to zero.|
Which simple machines are found on a hammer?
|A)||wedge and plane|
|C)||plane and lever|
|D)||screw and pulley|
Which is an example of work being done in a scientific sense?
|A)||carrying a box|
|B)||pushing against a stationary box|
|C)||lifting a box|
A 5,000 N block was lifted 10 m. How much work was done?
A chisel is an example of which machine?
|A)||wheel and axle|
What is the scientific formula for work?
|A)||W = F x d|
|B)||W = F + d|
|C)||W = F - d|
|D)||W = F/d|
The unit for work is a joule, which is equal to __________.
|B)||N - m|
|C)||N + m|
|D)||N x m|