Physics Applications
You and your friend are pulling a rope in a tug of war. You are pulling with 100N of force, and your friend is pulling with 110N of force. What is the net tension in the rope?
110N
an observation
What is the force that a rope can exert?
What is tension.
Who developed the 3 laws of motion?
4 or 4:1
A system
What is that force that resists motion?
friction
What is Newtons first law?
Objects in motion stay in motion, and those at rest stay at rest, unless acted upon.
Gil lifts 40kg 1m in 2 seconds. How powerful is Gil?
He is really powerful.
He lifts with 20 joules of power.
What is significant difference?
The difference between two test groups where the difference lies outside the estimated error for those two groups.
the state of an object where the net force is zero.
What is Newton's third law?
For every action, there is an equal and opposite reaction.
A machine uses 20 Joules of energy and produces 15 joules of power. What is the efficiency of the machine? Represent in percent.
75% efficient.
What are the steps to the scientific method?
Observation
Question
Hypothesis
Test
Conclusion
What two quantities do you need to include when describing a force?
Strength (or magnitude) and Direction
The tendency of an object to resist a change in motion is called what?
Inertia
The are equally powerful.
What is a possible explanation that can be tested?
a hypothesis
What is the law of conservation of energy state?
Energy can never be created or destroyed but only transformed into another form.
Total energy in the universe is constant and set.
When the acceleration of an object increases it indicates which two variables possibly change?
Force increases or mass decreases. (or friction decreases).