Show:
Gravity
Friction
Forces
Motion
All
100
What is the force of the Earth that pulls everything towards the center of the Earth?
Gravitational force
100
What are the two types of friction?
Kinetic friction and Static friction.
100
What is the difference between mass and weight?
Mass is the amount of matter in an object, but weight measures how much something weighs, and it changes when gravitational force does. Mass does not.
100
What is the name of the scientist that developed the three laws of motion?
Sir Isaac Newton.
100
People measure their weight, and any object's weight in kilograms or pounds. What unit of measure should they actually be using?
Newtons.
200
What is the gravitational force of the moon compared to that of the Earth?
⅙ (times smaller)
200
What is Friction?
A force that opposes motion between two surfaces that are in contact.
200
If gravitational force increases, then does distance increase, or decrease?
It decreases.
200
What is motion?
It's the action of changing one's location or position (object's or body's position).
200
If an object that had a mass of 70 grams was in space, then why would it's weight be 0 kilograms, but mass remain the same?
Because an objects mass never changes, even if the weight does. Mass is the amount of matter an object has. Even if an object is in space, it will still have the same amount of matter as it did on Earth.
300
The law of universal gravitation describes the relationship between ___,____, and ____.
Gravitational force, mass, and distance.
300
What lubricants do machines and engines use to reduce their friction?
Grease and Oil.
300
How does mass affect gravitational force?
It causes the gravitational force to increase.
300
What is Newton's second law of motion?
2- If you pull an object, or push it, then it causes acceleration, or a change in the objects speed/direction.
300
What kinds of substances can we use to reduce the amount of friction on an object's surface?
Lubricants.
400
Why don’t you see the effects of gravity?
Because the mass of the objects is too little to cause a force large enough to move objects towards each other.
400
What is Friction caused by?
It's caused by the hills and valleys on the surfaces of two objects touching each other.
400
When Newton saw the falling apple, what kind of force(s) did he conclude caused it to fall?
Unbalanced forces.
400
What is Newton's third law of motion?
3- That for every single action, there is an equal reaction, and an opposite reaction.
400
What kind of scale do you use to measure an object's mass?
A triple beam balance.
500
In what year did Sir Isaac Newton find the answer to the two very puzzling questions? What were those questions?
In 1665, and the two questions were “Why do objects fall toward Earth, and what keeps planets moving in the sky”?
500
If a car rolls across a smooth surface into an extremely rough surface, will it go farther than if it rolled over the extremely rough surface first?
Yes it would because the rough surface would immediately stop the car and cause friction right away.
500
Which planet has the greatest gravitational force?
Jupiter.
500
What is Newton's first law of motion?
1- That an object which stays still, always stays still, and that an object that moves, always keeps moving, unless an unbalanced force changes the motion (or lack of motion).
500
What is the property of matter that causes it to resist changes in speed/direction?
Inertia.