tools, with few or no moving parts, that make work easier
What are simple machines?
100
a magnet that is powered my electricity
What is electromagnet?
200
The force that causes objects to fall to the earth
What is gravity?
200
a change in motion, a change in direction, or both.
What is acceleration?
200
If the same force was applied, would an apple or a watermelon travel farther?
What is an apple?
200
List the 6 simple machines.
What are a lever, a wedge, a screw, an inclined plane, a pulley, and a wheel and axle?
200
A magnet that is created by rubbing a magnetic material over a strong magnet until the magnetic material's atoms are aligned for a short time after the strong magnet is removed is call a _____________.
What is temporary magnet?
300
When forces on an object cancel each other out, the forces are said to be ____________.
What is balanced?
300
A car travels 90 miles in two hours. The speed the car was going is ___________.
What is 45mph?
300
If a ball is rolling ang there are no forces acting on the ball, then __________________.
What is the ball will keep on rolling?
300
When a force moves an object over a distance, _______ is being done.
What is work?
300
If two magnet are lined up with the north pole of one magnet next to the north pole of another magnet, the magnets will _________.
What is repel each other?
400
Friction is a __________ force.
What is contact?
400
If two cars are traveling at 70 mph on the interstate and one is heading toward Knoxville and the other is headed toward Memphis. They have ____________ velocities.
What is different?
400
The tendency of an object to resist a change in its state of motion wether it is moving or at rest is __________.
What is inertia?
400
Levers are rigid bars that pivot around a point. The point where the lever pivots is called the __________.
What is fulcrum?
400
When atoms are all aligned in the same direction, a ________ is formed.
What is a magnet?
500
Air resistance is a form of_________.
What is friction?
500
A car had to stop at a red light. The car was going 40 miles per hour before it slowed down to a stop. The car slowed down in 4 second. The car was accelerating at __________.
What is -10mph/s?
500
An object has a mass of 30kg. The object is accerlerating at 10 m/s/s. The force applied to the object is ________.
What is 300 N?
500
Two simple machines that make the compound machine scissors.
What is a lever and a wedge?
500
In what two ways can we change the strength of an electromagnet?
What is wrapping more coils around the core or using a stronger battery?