What Do Forces Do?
The force that pulls down
Gravity
A tool scientists can use to measure force.
A spring scale
Scientists study patterns of motion to make predictions. Predict means to...
Use what you know to tell what might happen to the object in the future.
What is a permanent magnet?
A magnet that always has magnetic force. The magnetic field CANNOT be turned off and on.
What is an electric force?
A push or pull between objects that have an electric charge.
What can happen when force is put on an object?
What happens to an object that has unbalanced forces acting on it?
The motion of the object will change.
What is an example of a back and forth motion?
Swings
An electromagnet is a magnet that...
can be turned on and off.
What combination of charges will attract each other?
a positive charge and a negative charge
A change in position of an object is called _______
Motion
What happens when two forces push or pull on an object in the same direction? The force becomes _________
stronger in that direction
What are the three main patterns of motion? (100 points per answer)
1. Back and forth
2. In a line
3. In a circle
What will happen if you bring the north pole of one magnet near the south pole of another magnet?
They attract.
What does an imbalance of positive and negative charges cause?
static electricity
Two volleyball players hit a ball back and forth. If they use the same amount of strength, how are their forces different?
They are moving in different directions.
There are six children in this game of tug-of-war. They are split into two teams. At first the rope does not move. Are the forces balanced or unbalanced?
The forces are balanced.
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Where are magnetic forces strongest on a bar magnet?
Near the poles of a magnet. (north and south poles)
What is an example of static electricity?
clothing sticking together after going in the dryer, hair sticking up after rubbing a balloon or going down a slide, balloon picking up paper,
What makes a test fair? There are two possible answers.
1. Only one variable is changed at a time
2. There are multiple trials
A book is resting on a table. Are there forces acting on the book? If so, are the forces balanced or unbalanced.
There are balanced forces acting on the book.
What is the resisting force that happens when two surfaces rub against each other?
Friction
Engineers use magnets to design useful devices. Name one devices that uses either a permanent or electromagnetic magnet.
MRI machines, doorbells, navigational compasses
Explain how static electricity can make you feel a shock.
Electric charge can stick to you and build up in you. You can feel a spark when some of these charges jump away from you.