Forces Change Motion
My brain hurts
Newton, the Physics Sheriff
Mr. Reed, mad scientist
Math in Science
100
What is Motion?
Motion is a change in position over time.
100
What is "net" force?
The overall force acting on an object when all forces are combined.
100
What is Newton's first Law of Motion?
States an object at rest remains at rest, and an object in motion will remain in motion with the same velocity, unless acted upon by an unbalanced force.
Also called the law of inertia.
100
The larger the (blank) the greater the (blank).
Force, acceleration
100
Mass = ?
force/acceleration
200
What is a force?
A push or a pull
200
What is a "balanced" force?
Balanced Force is when the net force on an object is 0. Has same effect as no force at all. Cannot change an object's speed or direction
200
What is "inertia?"
The resistance of an object to a change in the speed or the direction of its motion.
The greater the mass the greater the inertia
200
If the force acting upon an object is increased, what happens to the object’s acceleration?
Acceleration increases
200
Force = ?
mass x acceleration
300
What is Contact force?
When one object pushes or pulls another object by touching it.
300
What is an "unbalanced" Force?
An unbalanced force will change an object's motion. One force is greater than another.
300
What is inertia? How is the inertia of an object related to its mass?
An object's resistance to having its state of motion changed. The greater the mass, the greater the inertia.
300
How does the mass of an object affect its acceleration?
With constant force, the greater the mass, the less the acceleration.
300
Acceleration = ?
force/mass
400
What is Gravity
The Force of attraction between two masses.
400
Explain the difference between balanced and unbalanced force.
Balanced forces do NOT change an object's motion. Unbalanced forces exert net force and can change an object's motion.
400
Once a baseball has been hit into the air, what forces are acting upon it? How can you tell that a force is acting upon it?
Gravity, friction, as shown in the chnage in speed and direction.
400
When an object moves in (blank), its force and acceleration is directed towards the (blank) of the circle.
circles, center
400
What force keeps an object moving in a circle? In what direction does this force act?
Centripetal, the center
500
What is Friction?
Force that resists motion between two surfaces that are pressed together.
500
What is the relationship between force and motion described by Newton’s first law?
An object's state of motion does not change unless acted upon by an unbalanced force.
500
Newton’s second law of motion states...
The acceleration of an object increases with increased force and decreases with increased mass.
500
What is the force that keeps an object moving in a circle?
Centripetal force
500
What force is needed to accelerate an object 5 m/s² if the object has a mass of 10 kg?
F = ma = 10kg x 5 m/s2 = 50 N