Definition unit 1
Force
A push or a pull that is capable of changing an object's state of motion
Velocity
The speed of an object in a given direction
Newton's second law of motion
displacement/time
velocity
Acceleration of gravity
9.81m/s2
Mechanical Equilibrium
A state where no physical changes occur. The net force is zero.
Acceleration
The rate at which velocity is changing
Newton's third law of motion
For every action there is an equal and opposite reaction
acceleration
The horizontal acceleration of a projectile
0
Newton's first law of motion
An object at rest tends to stay at rest and an object in motion tends to stay in motion unless an outside force acts upon it
Vector quantity
A quantity that needs both magnitude and direction
Elastic collision
A collision in which objects are not deformed and do not generate heat
1/2 acceleration x time2
distance
How many sigfigs in .023030
5
Weight
The force, caused by the acceleration of gravity, acting on the mass of an object
Free fall
Motion under the influence of gravitational force only
Terminal velocity
The speed at which the acceleration of a downward falling object is zero because friction balances the weight
mass x velocity
momentum
How many sigfigs in the product of 45.63 x 21.0
3
Inertia
The property of matter that resists a change in motion
Projectile
An object that moves through the air or through space acted on only by gravity
Law of conservation of momentum
In the absence of an external net force, the momentum of a object or system of objects will remain unchanged
Force x time
impulse
How many sigfigs in the sum of 107 + 100
1