Gravity 1
Gravity 2
Weight and Mass
Balanced vs Unbalanced
Friction
100
The pull of gravity is always toward the ____ of the planet
What is core
100
The more the _____ the more the gravity.
mass
100
True or False. Mass is a measure of the amount of matter in an object and is measured with a spring scale.
What is false
100
Balanced forces have a net force of _____ N.
What is zero
100
The strength of friction is affected by the _____ of the surfaces and the strength of the force squeezing them together.
What is roughness
200
The force of gravity is measured in this unit in the SI system.
What is Newtons
200
The more the ______ the less the gravity.
What is distance
200
If somehow the mass of the Earth doubled, your weight would ______.
What is double
200
A wrecking ball hanging from a crane in mid air and not moving is an example of _______ forces.
What is balanced
200
_____ friction is a force that resists the movement of two surfaces sliding together.
What is kinetic
300
Gravity balances both sides of a see-saw when the _________ on both sides is equal.
What is torque
300
True or False. There would ALWAYS be more gravitational attraction between two bowling balls than two feathers.
What is false
300
True or False. There is no relationship between weight and mass.
What is false.
300
Give an example of something experiencing balanced forces (pick one person in your group to speak for the group).
Answers will vary.
300
True or False. Friction is only helpful, never harmful.
What is False.
400
The force of gravity always ____ and never ____.
What is pulls and pushes
400
Your weight is determined by your ______ and the ______ of the planet you are on.
What is mass
400
True or False. The reason astronauts in the space station are weightless is because there is no gravity.
What is false
400
A net force of greater than ____ will cause something to change its speed, direction, or both. This is called a(n) _______ force.
What is >0 and unbalanced
400
Friction between surfaces causes heat, so wheels, ball bearings, and ______ are used to reduce it.
What are lubricants
500
If the distance between the earth and the moon were to increase 7 times, how many times less would be the force of gravity between them?
49 times less
500
The equation for Newton's law of universal gravitation is _______.
What is
500
If Pluto has a mass of 0.08 of the Earth, this would be the weight of a 100 pound person there.
What is 8 pounds
500
In which direction is the net force on an object with a force of 113N north, 112N east, 87N south, and 209N west.
What is northwest.
500
True or False. The amount of surface area of two surfaces in contact always affects the friction force between them.
What is false