Force Basics
What is a force?
A push or a pull
What is mass?
The amount of matter in an object
What is the name of the force that resists motion across a surface?
Friction
What is the force of attraction and repulsion caused by the structure of atoms in a material?
Magnetism
What is motion?
Any movement or change in place/position.
Brandon is just watching TV. Is he applying a force to the TV?
What is the force of gravity pulling on an object?
Weight
What type of friction makes it hard to start moving an object?
Static friction
What side of the magnet is attracted to the north pole of another magnet?
The south pole
What causes motion?
Unbalanced forces
Wendy wonders if people with red hair are more likely to like vegetable than people without red hair. What part of the discovery process is this?
Ask a question
What affects how much gravity a planet or star has?
It's size. Bigger planets and stars have more gravity.
Sliding friction
Yes. In class, many magnets were able to hold more washers than a single magnet.
What do we measure motion with?
Speed
True or false: Force requires direct contact
False
What happens to a person's weight on the moon?
It decreases because there is less gravity
What does it mean that something is a factor that affect friction?
It changes how much friction there is
True or false: All metal objects are affected by a magnetic field
False. Some metals such as aluminum foil are not.
What is the formula for speed?
Distance / time
Name the 4 difference forces that we have discussed in class. You MUST name all of them to receive points.
Gravity, weight, friction, magnetism
If you named mass you do NOT get points
If you thought gravity and weight were the same and counted them as one you DO get points.
What happens to a person's mass on the moon?
It stays the same. Mass is not affected by gravity because the amount of matter in an object does not change when gravity changes.
Describe an experiment that you could do to find out if speed affects friction. Include HOW you will know if speed affect friction.
Measure the force it takes to pull an object across the SAME surface at DIFFERENT speeds. If the force needed to pull the object at a slower speed is different than the force needed to pull the object at a faster speed, then speed affects friction.
What do you call the region where a magnet can exert a force?
Magnetic field
What is inertia?