Flash Cards 1

Question 1

Speed equation

Answer 1

𝑠=𝑑/∆𝑡

Question 2

Velocity equation

Answer 2

𝑣=∆𝑥/∆𝑡

Question 3

Acceleration equation

Answer 3

𝑎=∆𝑣/∆𝑡

Question 4

Describe the relationship between the
direction of the displacement and
velocity vectors for any object in
motion.

Answer 4

The displacement and velocity vectors are ALWAYS in the same direction; ie: +Δx & +v or - Δx & -v

Question 5

Describe the relationship between the
direction of the velocity and
acceleration vectors for an object that
is speeding up.

Answer 5

The velocity and acceleration vectors are in the same direction; ie: +v & +a or -v & -a

Question 6

Describe the relationship between the
direction of the velocity and
acceleration vectors for an object that
is slowing down.

Answer 6

The velocity and acceleration vectors are in the opposite direction; ie: +v & -a or -v & +a

Question 7

Which 5 variables should you always list
out when solving motion problems with
kinematic equations?

Answer 7

𝒕=
𝒗𝟎=
𝒗𝒇=
𝒂=
∆𝑥=

Question 8

Force

Answer 8

any push or pull on an object resulting from the object
·vector quantity with both magnitude and direction
·unit: Newtons (N)

Question 9

gravitational force (Fg)

Answer 9

the attractive force between any two objects with mass; the force that causes the acceleration due to gravity
·Fgravity = mg (where g is the acceleration due to gravity -9.8 m/s2)

Question 10

weight

Answer 10

The magnitude of the gravitational force

Question 11

non-contact forces

Answer 11

interactions between objects that are not touching

Question 12

contact forces

Answer 12

interactions between objects that are touching

Question 13

friction force (Ff)

Answer 13

the force opposing the relative motion of an object
typically the kinetic friction force
𝐹𝑓=𝜇𝐹𝑁

Question 14

drag Force (Fdrag)

Answer 14

the force opposing the relative motion of an object as it moves through a gas (such as air) or a liquid

Question 15

air resistance (Fair)

Answer 15

type of drag force, specifically referring to the friction force opposing the motion of an object as it moves through the air

Question 16

kinetic friction (Ff)

Answer 16

the force exerted by a surface opposing the motion of an object as it moves across it
𝐹𝑓=𝜇𝑘𝐹𝑁
𝜇𝑘 is the coefficient of kinetic friction

Question 17

static friction

Answer 17

the force exerted by a surface opposing the motion of a stationary object that is trying to move (ie: there is an applied force but the applied force is too small to overcome the friction force)

Question 18

normal force (FN)

Answer 18

the supporting force exerted upon an object that is in contact with another stable object.
“normal” means perpendicular so this fore is perpendicular to the surface the object is touching

Question 19

tension force (Ft)

Answer 19

the force exerted on an object by the tension in a string, rope, cable or wire when it is pulled tight

Question 20

net force (Fnet)

Answer 20

The sum of all forces acting on an object. 𝐹𝑛𝑒𝑡=𝑚𝑎