Physics 30

Question 1

Uniform Motion

Answer 1

When an object is moving at a constant velocity,
it has no acceleration.

Question 2

Kinematics

Answer 2

Also called applied kinematics. the theory of mechanical contrivance for converting one kind of motion into another.

Question 3

Uniform (Constant) Acceleration

Answer 3

If an object is accelerating, then its velocity must be changing. For projectile motion near Earth’s surface, when an object flies through the air, the air,
its acceleration is always 9.81 m/s2 down (as long as we can ignore air resistance).

Question 4

Momentum and Impulse

Answer 4

Momentum: Force or speed of movement

Impulse: an impelling action or force, driving onward or inducing motion.

Question 5

Dynamics

Answer 5

the motivating or driving forces, physical or moral, in any field.

Question 6

Newton’s 1st Law

Answer 6

If an object is moving at a constant velocity (uniform motion), then:
* The forces must be balanced ( Fnet
 = 0 )
* The object continues to move due to inertia.

Question 7

Inertia

Answer 7

the property of matter by which it retains its state of rest or its velocity along a straight line so long as it is not acted upon by an external force.

Question 8

Newton’s 2nd Law

Answer 8

If the forces are unbalanced on an object, it experiences uniformly accelerated motion:
* The object will accelerate in the same direction as F
net
* Key equation:
ner = mã where Fner = F, + F,+…

Question 9

Newton’s 3rd Law

Answer 9

When one object exerts an action force on a second object, the second object will exert
an equal but opposite reaction force onto the first.