Force
Motion and Waves
Measurements
Work
Machines

100

What is force?
Force is a push or pull.

100

If you push a book across a table and it moves to the right, which direction are you moving the book?
To the right

100

What measures how far something travels?
Distance

100

What is work?
Work is the use of force to move an object over a distance.

100

What is a simple machine?
A machine with few or no moving parts to which you only apply one force

200

What is the force that pulls objects toward Earth?
Gravity

200

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Your team wins an additional 200 points!

200

What is the measurement of how long something takes?
Time

200

Give an example of doing work. Give an example of NOT doing work.
Work = motion. Anything that doesn't move isn't work.

200

What type of simple machine is a seesaw? A doorknob?
A lever, a wheel and axle

300

What is net force?
Net force is the total (or sum) of all the forces acting against an object.

300

What enables waves to move matter? Their speed, their weight, their wavelength, or their energy?
Their energy

300

What are the measurements needed to find the speed of an object?
Distance and time

300

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Your team has earned 300 extra points!

300

What are the parts of a lever? Give 2 examples of levers.
A lever is a bar that pivots on a fixed point (the fulcrum). Examples: seesaw, a broom, a mop

400

If a baseball and bowling ball are thrown with the same amount of force, why does the baseball travel farther?
The baseball is lighter and has less mass, so it takes less force to move. It is more difficult to move a bowling ball than a baseball. Since a bowling ball is heavy and has a lot of mass, it cannot be moved as easily.

400

What is wavelength?
Wavelength is the distance between one point on a wave to the same point on the next wave. Ex: crest to crest, trough to trough, etc.

400

What two things are needed to measure how much work has been done?
Force and distance

400

If you push against a heavy door as hard as you can, and it doesn't move, are you doing work? Why or why not?
You are not doing work. Work is only done when you move something. If the door didn't more, you didn't do work.

400

Why does it take less force to turn a screw into wood than to drive in a nail?
The threads on the screw help it to travel a greater distance. It is easier to turn than to push.

500

Imagine that you and your brother are both pushing on a table with the same amount of force, in opposite directions. Why isn't the table moving?
You and your brother are pushing in opposite directions and canceling out each other's force. The net force on the table is zero, so the table will not move.

500

You are playing basketball. What two things (scientific terms) affect the motion of the ball?
Motion is affected by mass and force. The greater the force, the farther the ball will go. If the ball had a different mass, the same amount of force would move it a different distance.

500

What is the relationship between speed, distance, and time?
Speed is the distance an object travels in a certain amount of time. Speed relates distance to time. If two airplanes travel for the same amount of time, but one travels 500 km and the other only travels 200 km, we can tell that the speed of the first plane was greater than the second, because the first plane went a greater distance in the same amount of time.

500

How do machines make work easier?
They lessen the amount of force needed to do a job.

500

What are two ways you could move a heavy box onto a platform, using two different simple machines?
You could push the box up a ramp, which is an inclined plane. You could attach the box to a pulley and pull down on a rope to lift the box.