Balanced and Unbalanced forces
Balanced forces are equal in magnitude and opposite in direction,causing no acceleration. Unbalanced forces are not equal, resulting in a net force and acceleration.
What is Friction and what is used to measure friction?
A force that acts on objects when they move.
A newtonmeter used to measure friction between two surfaces.
What is Aristotle's view?
He believed objects moved when and external force is applied and slows down when the external force is removed.
What is the force that holds the climber when the rope is stretched?
Tension
What should data be presented in?
Data should be presented in tables with clear headings including the measurements and the units. (e.g. Weight(N) and Extension(cm)).
If an object is moving at a constant velocity, are the forces balanced or unbalanced?
Balanced. an object in motion stays in motion with the same speed and in the same direction.
Describe microscopic roughness?
A surface that appears smooth is uneven when viewed under a microscope.
What was Galileo's Question and what did he do?
Galileo wondered what would happen when there is no friction. So, he did a thought experiment.
What is the difference between elastic material and plastic material?
Elastic material: They return to their original length after the force is removed.
Plastic material: The material does not return to their original length after being stretched.
What is the formula for calculating ONLY extension?
Original length - New length after adding the weight
What happens to an object's motion when an unbalanced force is applied?
What is the Effect of friction on Motion?
If your pushing force is greater then friction, the object will accelerate as forces are unbalanced.
Galileo did a thought experiment instead of experimenting in a lab,Why?
This is because friction will always exist between 2 surfaces.
What are springs used for and why?
Springs are used in spring balances, trampolines and car suspension. This is because they can store energy, absorb shock, maintain force or control motion.
What is mean extension?
Measurement repeated three time usually to make the data more accurate and reliable.
How does a boat stay floating?
The weight of the boat is canceled out by the up thrust.
What is Lubrication?
A layer or oil or wax in between two surfaces makes it easier for them to slide over each other.
Galileo imagined a ball rolling down and then up various slopes, what are the slopes and what happened?
Equal slopes: The balls would reach the same height it started from.
Longer second slopes: the ball rolls to its original height.
Flat surfaces: The ball would continue to roll at a steady speed as it cannot reach its original height.
What is the elastic limit?
If the spring is stretched too much, it reaches a point where it becomes permanently extended.
What variable can you get from Weight and Extension?
Continuous variable
What is the resultant force/ net force when it is balanced and unbalanced. (asking answers for both balanced and unbalanced).
For balanced, the resultant force/net force is ZERO
For unbalanced, the resultant force/net force is not ZERO.
Give me 2 advantages and disadvantages each for friction.
Advantages: Allows vehicles to brake safely and allows you to walk without slipping.
Disadvantages: Causes Wear and Tear and Produces Unwanted Heat and Energy Loss.
(these are examples)
After this for 100 years, what did Issac Newton put in his First Law of Motion?
What is Inertia?
When a external force is applied on a stationary object, the object will continue to move straight at a steady speed.
Inertia is property of objects refusing changes to their motion.
What is Hooke's Law?
The extension that is proportional to the force, so if the force doubles then the extension doubles.
What are Anomalous Results and how do you solve it?
Data points that does not fit best for the line of best fit and you can fix this by checking your data twice and redoing the experiment.