Newtons Laws
According to Newtons third law forces will always act ________
in pairs
What is the acceleration of a toy car that has a mass of 2kg and a force of 10N is needed to move it?
5 kg/s/s
In which direction does frictional force act on a moving object?
against the object
____ is the speed of an object and the direction of motion.
velocity
Newton first described gravity while watching...
an apple fall from a tree
Newtons _____ law of motion explains why you may lean sideways in a car if the driver turns a corner too quickly.
first
What is the formula for Average Speed?
total distance / total time
This is the change of an object's position.
motion
This occurs whenever an object speeds up, slows down or changes direction.
acceleration
An object that experiences a push or a pull has a(n) __________ exerted on it.
unbalanced force
Which do you think would have greater Inertia: an empty box or a box filled with bricks? Why?
Bricks - it has more mass
A runner moves 24 km in 120 minutes. What is the speed of the runner in minutes?
.2 km/m
The force that pulls any two objects toward each other is ....
gravity
More mass = more inertia
Less mass = less inertia
What law does this help explain?
The golf ball will go further (less mass)
2nd Law
The reason you fly forward when the car brakes is because of ___________. Which explains _____ law.
inertia, first
a car travels from 20mph to 80mph in 3.5 seconds. What is the acceleration rate of the car?
(go 2 places after the decimal)
17.14 mph/s/s
9.8 m/s/s represents this.....
the pull of gravity acting on an object
This is when the force of gravity is balanced with the air resistance acting against it. A falling object is traveling as fast as it can possible go.
Terminal Velocity
This is the sum of all forces acting on an object at rest or in motion.
net force
A camper hoists a 20 kg backpack straight up the side of a 20 m tall cliff. If the camper hoists the backpack from rest and it accelerates to a velocity of 5 m/s² how much force was used to lift the backpack?
100N
What is the mass of a moving object that has has a force of 24.99 Newtons and and an acceleration of 3.5 m/s/s
mass = 7.14
what is the force that acts in a circular motion?
centripetal
_________is the support force exerted upon an object that is in contact with another stable object.
Normal Force
This scientist suggested, objects with different masses experience the same acceleration from gravity and will fall at the same speed.
THIS IS NOT ON TEST!
Galileo