What does the word "contact" from "contact force" mean?
touch; when two or more objects touch
What type of force occurs between a bike's wheel and ground? (besides gravity)
friction
Because of gravity, the moon is pulled towards the earth, and the earth is...
pulled towards the moon (or, towards the sun)
Name two kinds of contact forces.
Tension, Friction, and Spring Force (possibly "object" force)
Name two kinds of non-contact force.
gravity, magnetic, electricity (static electricity), buoyancy
Balanced forces on an object means that, for example, gravity is pulling something down with 25kg of force, and the floor is pushing up with...
25kg of force
A scale measures what? (mass, volume, density)
mass
Gravity is pulling the balloon down AND a tiny little mouse is pulling the balloon down by a string BUT air friction is pulling the balloon up AND flying butterflies are pushing the balloon up. What are all those forces called toegether?
net force
What kind of force only works with metals that have iron?
magnetic force (or, magnet)
Which type of force occurs when something is pulling itself back INTO shape?
spring force
An object in motion tends to...
stay in motion (keep going, etc)
An object at rest (stopped) tends to ...
stay at rest (stay stopped, etc.)
If an object is moving left and its slowing down, it's because of friction. What is friction doing? (pushing the object left; pushing the object right; pulling the object left; pulling the object right)
It's pulling the object right.
You and your dog are both pulling at a toy. The dog is winning. This is an example of ____ forces
unbalanced forces.
