Physical science test
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Law of force and acceleration
The acceleration of an object is decedent upon two variables
Law of Inertia
An object at rest stay at rest and object in motion stay in motion unless acted on by outside force
Law of action/reaction
For every action there is an equal and opposite reaction
How can newtons law apply in a car crash?
Third law applies When a car hits with the same force as the other car action and reaction occurs
Which of newtons law applies to the rocks that gets stuck while the other plate is subducting into the mantle?
Acceleration
Which law causes the land to bulge up above the subducting plate?
Action and force
Which law causes tsunami to occur when earth quakes take place in the water?
Law of inertia
1st law
• only force has the ability to change motion • net force determine how an object moves • change in motion comes from unbalanced forces • Inertia is the property of an object that resists changes in motion
2nd law
• Acceleration is the result of unbalanced forces • A large force equal a larger acceleration • Acceleration is inversely proportional to mass • Force and motion comets through acceleration • Acceleration is proportional to force • Net force affects motion • Formula : force divided by mass
3rd law
Action and reaction is equal in force More mass result in less acceleration D=MV Force only comes in action (action pair) Momentum=mass
What are variables of motion?
The variable of motions are • position • velocity • speed
Why is friction between moving parts of machines undesirable?
It waste energy that could otherwise be used to perform work, make heat!
What do we do to reduce that friction?
applying lubricant such as oil
An example of motion
Rolling down a hill
An example of simple movement
Walking in a line
An example of complex movement
A ball being thrown in the air
Position
Where an object is located
Speed
Precisely how fast an object is moving Formula:Distance/Time
Acceleration
Precisely how fast an objects speed is changing
Distance
Velocity/time
Time
Distance / Speed
Exact number
Any number obtain by counting or given by definition
Approximate number
Any number obtain by a process of measurement
Accuracy of an approximate number
Number is judge by number of significant digits