Newton's Laws
What is Newton's First Law?
An object in motion stays in motion, an object at rest remains at rest unless acted upon by an outside force
What is the unit for time?
Seconds, hours
What is a force?
A push or pull
What is the force placed on a baseball that has a mass of 0.25kg and is accelerated at 4m/s/s?
1N
How do you calculate mass based on Newton's 2nd Law?
m=F/a
What is Newton's 2nd Law?
F=ma
What is the unit for distance?
Meters, kilometers
What is gravity?
the downward force on an object by a more massive object towards that objects center of mass
What is the velocity of a bicycle that travels a distance of 20km in 1 hour?
20km/hr
You and some friends are racing shopping carts. One cart has a friend in it that has a mass of 50kg and the other cart has a friend with a mass of 62kg. Which cart has more inertia?
The cart with the 62kg friend
What is Newton's 3rd Law?
For every action force, there is an equal but opposite reaction force
Why are units important? Why do we use them?
They give meaning to numbers, otherwise numbers are meaningless
What is mass?
The amount of matter in an object
What is the acceleration of a turtle sliding down a slide if his velocity is 2m/s and it takes 2 seconds?
1m/s/s
You push against a door with a force of 10N but the door won't open. The door has a weight of 100N. What force does the door push back on you?
10N
What is inertia and how is it measured?
The tendency of an object to remain in motion or remain at rest. It is measured by the objects mass.
What is the unit for velocity?
meters per second
What is weight?
The amount of force an object is exerted on based on gravity
What is your weight on earth if you have a mass of 10kg?
980N
How would the acceleration of an object change if the mass stayed the same but the force on the object increased?
The acceleration would increase
Explain why Newton's 1st Law is called The Law of Inertia?
Because it is stating that an object wants to continue to move or stay at rest and the only thing that will change that is an outside force. The larger the mass, the greater force will need to be applied.
What are the units for acceleration?
meters per second per second
What is velocity?
Speed in a given direction
An apple falling from a tree strikes the ground 3s after it falls. What was the apples velocity on impact?
29.4m/s
How does Newton's 3rd Law apply to rockets?
The thrust force from the engines points towards the ground creating lift of the rocket in the opposite direction