Balanced/ Unbalanced Forces
Force that causes an object to move?
Unbalanced Force
What is a non contact force? (provide Definition)
A force that one object can apply to another object without touching it
What is a contact force? (Definition)
A force that acts between objects that are touching each other.
What is the measure of the force of gravity?
Weight
A force that pulls metals towards a magnet?
Magnetism or Magnetic Force
What is an example of a balanced force?
examples may vary;
ex: holding books
What forces are non-contact forces?
1) Gravity
2) Magnetic Force
3) Electrical force
What two forces that we learned about are contact forces?
Applied force, friction
The larger the mass of an object, the greater the gravitational pull.
True/ False/None
True
You are pushing a wheelbarrow. What happens to the wheelbarrow's motion if more mass is added?
*The motion will remain the same
*The motion will increase.
*The motion will decrease.
*The motion will change directions.
*The motion will decrease.
Demonstrate/act out an example of an unbalanced force.
examples may vary;
ex: Holding a balloon and then someone pushing into me - dropping it.
____ is acting all around us, what is it?
Gravity
Why does a ball stop rolling?
Friction
The weight of an object _________ as it moves away from the center of Earth.
(Increase, decrease, stays the same, Triples, Doubles, Quadruples)
Decreases
Read the following two statements:
l. Mass is measured in grams.
ll. Weight is measured in Newtons.
Which is correct about the above statements?
(I, II, Both, Neither)
Both are correct
What is the net force of a box that is being pushed 1200N upwards and 800N downwards? (Please include a number and explanation of which direction)
400N Upwards
Two poles that are the same will ________ each other.
Repel
Which of the following describes a contact force?
the moon orbiting the earth
a leaf falling to the ground from a tree
a ball getting hit at bat
iron filings being pulled up by a magnet
a ball getting hit at bat
On which planet would your mass be the greatest?
(Earth, Sun, Jupiter, Venus, Pluto, Mars, Saturn, None)
None
Your mass would always stay the same
Which phrase best describes a gravitational force?
A. a force that spins objects
B. a force that pulls objects toward each other
C. a force that can make objects both attract and repel each other
D. A force that acts only when two objects are in contact with each other
B. a force that pulls objects toward each other
Look around the room, what do you see that is using a balanced force? Explain why?
ex: a chair - because there are forces being exerted on it that cause it not to move
The two factors that affect gravity are:
Mass and distance
The action of one surface or object rubbing against another is called?
Friction
An object is moved from earth to the moon that has different gravity. Why does the object's mass stay constant, while its weight changes?
A. Mass does not change because it is a constant force.
B. Mass does not change because it is resistant to acceleration
C. Mass does not change because it adapts to the change in gravity.
D. Mass does not change because the amount of matter stays the same.
D. Mass does not change because the amount of matter stays the same.
10, 11, 9, 9, 6, 3
8