Chapter 2 (B - 2.6 to 2.14) - Forces, Momentum, etc

Question 1

Force

Answer 1

pull or push exerted by one object on another

Question 2

Newton’s first law of motion

Answer 2

A stationary object will remain stationary if no external force acts upon it, an object in motion will keep moving at a steady speed in a straight line, without any interference by any other external forces.

Question 3

Balanced forces

Answer 3

Forces that are in balance cancel each other out

Question 4

Terminal velocity

Answer 4

When the air resistance is equal to the weight of the object, and the forces are balanced, it reaches it max speed, which is its terminal velocity

Question 5

Resultant force

Answer 5

The force that is equivalent too two unbalanced forces.

Question 6

force formula

Answer 6

F = ma

Question 7

1 Newton:

Answer 7

The force required to give a mass of 1 kg am acceleration of 1m/s

Question 8

Friction

Answer 8

Force that stops materials from sliding over each other.

Question 9

Static friction

Answer 9

The friction that stops a stationary body from moving.

Question 10

Dynamic friction

Answer 10

The friction that is created between moving objects.

Question 11

Drag

Answer 11

Dynamic friction objects experience as they move through a fluid.

Question 12

Weight formula

Answer 12

weight = m*g

Question 13

Newton’s third law of motion

Answer 13

every action has an equal and opposite reaction.

Question 14

Momentum formula

Answer 14

mv

Question 15

momentum (resultant force formula)

Answer 15

force = change in momentum/change in time

Question 16

impulse

Answer 16

force * time

its the change in momentum

Question 17

eq for final velocity when initial v, acceleration and time are given

Answer 17

final = initial + accelerationxtime

Question 18

eq for final velocity when initial v, acceleration, and displacement are given

Answer 18

final^2 = initial^2 + 2 x acceleration x displacement
v^2 = u^2 + 2as

Question 19

eq for displacement when initial v, time and acce is given

Answer 19

displacement = initial velocity x time + 1/2 acceleration x time^2
s = ut + 1/2 at^2

Question 20

eq for displacement when final v, time and acce is given

Answer 20

displacement = final velocity x time - 1/2 acceleration x time^2
s = vt - 1/2 at^2

Question 21

eq for displacement when final v, initial v and time is given

Answer 21

displacement = half (initial + final) x time
s = 1/2 x (u + v) x t

Question 22

Direction of centripetal force

Answer 22

towards the center

Question 23

what provides centripetal force

Answer 23

friction between the track (thing the obj is rotating on) and the object

eg in a roudn race track
friction between tires and tires

Question 24

Why would an object going flying from a circular motion

eg why would a car go off the track after it speeds up

Answer 24

friction provided for centri petal force is too less for the car and therefore it goes of the track in a tangential manner