Newton's First law
What is the property of an object that makes it hard to change motion?
Inertia
The force due to gravity is called...
Weight
What contact force opposes the motion of objects
friction
A push or pull that one body exerts on another
Force
How many laws of motion did Newton write?
3
An unbalanced force can change what two things about an objects motion?
Speed and Direction
What is the force of attraction between two masses?
Gravity
If a 65 kg student exerts a net force of 100 N on a 100 kg desk, what is the magnitude of the force that the desk exerts on him?
100 N
Forces that are not equal are called
Unbalanced force
For every action there is an equal and opposite reaction force
Newton's third law of motion
An object that is still will only change if acted upon by what
Unblanaced force
The equation for Newton's second law is...
F=ma
You and a friend are pulling on a rope in opposite directions as hard as you can. What is the "equal and opposite force" to the force of your hand pulling on the rope described by Newton's Third Law?
The rope pulling your hand
What happens if the net force acting on an object is zero
The object's movement will not change
An object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by a net force
Newton's First Law
An object with a lot of inertia is likely to do what
Resist change in movement
If a net force of 24 N is applied to an object with a mass of 6 kg, then what will the resulting acceleration be according to Newton's second law of motion?
4 m/s2
A student weighing 600 N stands on a scale in an elevator. If the scale reads 800 N, the elevator must bedoing what?
Accelerating upwards
What happens if the net force is any nonzero number
The object will accelerate/change motion
The acceleration of an object is directly proportional to the net force acting on it and inversely proportional its mass
Newton's 2 law
An object is moving at a constant speed and there are balanced forces acting on it. What will happen to the object?
Continue at the same speed
An object is moving in a circle at a constant speed.It is experiencing an unblanced force.
True or False
True
A man shoots a rifle and the force of the shot results in recoil. The magnitude of the force on the rifle is __________ the magnitude of force on the bullet, and the magnitude of acceleration of the rile is __________ that of the bullet.
the same... smaller than
How do you calculate Net Force
You find the sum of all forces acting on the object
Which scientist did Newton study before writing his laws?
Galileo