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Grade 3 Science, Forces
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Gravity pulls you to the ground with a lot of force. That also means...
you are pulling it to you. (two objects with mass move towards eachother)
Please give an example of friction.
Rubbing our hands together; using brakes on your bike...or even the contact between the wheels and the ground (etc.)
Please give an example of spring force.
A bouncing ball; a spring in a pinball machine; a rubber band springing back.
Please give an example of tension force.
A string pulled tight can pull another object.
You and your dog are both pulling at a toy. The dog is winning. This is an example of ____ forces
unbalanced forces.
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.
An object at rest (stopped) tends to ...
stay at rest (stay stopped, etc.)
An object in motion tends to...
stay in motion (keep going, etc)
Which type of force occurs when something is pulling itself back INTO shape?
spring force
Which type of force happens when an object is pulled OUT of shape?
Tension
What kind of force only works with metals that have iron?
magnetic force (or, magnet)
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
A scale measures what? (mass, volume, density)
mass
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
Name two kinds of non-contact force.
gravity, magnetic, electricity (static electricity), buoyancy
Name two kinds of contact forces.
Tension, Friction, and Spring Force (possibly "object" force)
Because of gravity, the moon is pulled towards the earth, and the earth is...
pulled towards the moon (or, towards the sun)
What type of force occurs between a bike's wheel and ground? (besides gravity)
friction
What does the word "contact" from "contact force" mean?
touch; when two or more objects touch