newtons 1st law
True or false: An object in motion will continue in motion at a constant speed unless acted on by a net external force.
False
True or false: The acceleration of an object depends on all the forces on it, both internal and external.
False
what is Newton's third law?
For every action, there is an equal and opposite reaction.
What is Isaac Newton known for? (2 things)
Isaac Newton is known as the “Father of Physics”. His formulation of the three laws of motion.
What is friction ?
The action of one surface rubbing against another
Why heavier objects require more force than lighter objects to move or accelerate them?
An object with more mass moving at the same acceleration as a lighter object would require more force to change its speed or change its direction. *The formula F=m x a is from Newton’s second law
what is not an example of Newton's 3rd law? Sitting on a bus(stops, getting pushed), swimming (pushing water), rowing a boat
Sitting on a bus
who was aristotle and what was his claim?
he was a philosopher in the 24,000’s and his claim was that objects need a force to keep moving at a constant velocity.
Is a force needed to keep an object in motion?
A force is NOT needed to keep an object in motion.
Find the force : Sarah rides a bike at an acceleration of 5m/s 2 and has a mass of 80kg. How much force is Sarah putting to her bike to move at this rate? (Hint: F=MxA)
400 N
How are rockets launched into space? (Use Newton's 3rd law)
Newton's 3rd law proves that when a rocket pushes out fire with an amount of force, the rocket will move in the opposite direction, with the same amount of force. This causes the end result to shoot up into the air.
What was Galileo’s belief and how did he help Newton? (2 things)
He helped conclude Newton's belief that objects in motion tend to stay in motion. He also was the first to imagine a world with NO friction.
How does Newton’s first law explain what happens in a car crash?
When a car crashes, there is no unbalanced force acting on the person, so the people continue moving forward.
What does the “~” symbol mean ?
it means proportional to
what is a net force?
a net force is a combination of if all the forces acting on an object
What is inertia?
Inertia is the tendency of an object to resist any change in motion.
Sanvi is controlling a 50,000 kg helicopter which is accelerating at a rate of 4m/s 2. How much force does Sanvi put to move at that rate? ( F=m x a)
200,000 N
How does the third law affect a game of Tug of War?
One of the team pulls the rope towards them with an amount of force and the other team is doing the same thing on their rope. The same amount of force is applied from the ground to the people as they are putting on the ground