Lecture 1: Translational Motion Flashcards
1
Q
Displacement vs distance
A
- Displacement: distance final-distance initial
1a. Movement relative to starting point - Distance is total movement of person
2
Q
Velocity vs speed
A
- Speed= total distance/time
- Velocity=displacement /time=(xf-xi/t)
2a. Average velocity=displacement/time
2b. Instantaneous velocity =displacement/specific time
3
Q
Acceleration
A
- Acceleration=(vf-vi)/t
4
Q
Displacement vs time graph
A
- Y axis=displacement, x axis=time… slope gives average velocity (v=d/t)
1a. Instantaneous velocity is found via the slope of the tangent
5
Q
Velocity vs time graph
A
- Y axis velocity and x axis is time
1a. Slope gives us acceleration (a=v/t)
1b. Area under the graph gives us the displacement (velocity x time)
6
Q
5 equations of constant acceleration (uniform motion)
A
- No d: v2=v1 + at
- No v2: x=v1t + (1/2)at^2
- No a: x=((v2-v1)/2)t
- No t: v2^2=v1^2 + 2ax
- No v1: x=vt - (1/2)at^2
7
Q
Key words that’ll give hints
A
- “From rest”: vo=0
- “Brought to a rest”: v2=0
- “Reaches max height”: Vy=0
- If object is falling: a=10m/s^2
- Object falling from rest: v2=sqrt(2gh)
8
Q
Projectile motion
A
- V initial
1a. Vox=vo(cos0)
1b. Voy=vo(sin0) - Acceleration
2a. Ax=0m/s^2
2b. Ay=-10m/s^2
9
Q
Kinetic vs potential energy
A
- Kinetic: increases with speed
- Potential: increases with height
10
Q
Newtons 3 laws
A
- Newton’s first law: Fnet=0 when v is constant
- Newton’s second law: Fnet=ma when acceleration occurs
- Newtons third law: there is always an action-reaction pair
11
Q
Mass vs weight
A
- Mass: m=kg
- Weight: F=mg=N
12
Q
Newtons law of Gravitation
A
- Fg=(Gm1m2)/r^2
1a. G=7 x 10^—11 Nm^2/kg^2
13
Q
Weight on a slope
A
- Down slope=mgsin0
- Downward on box= mgcos0
14
Q
Normal force
A
- Opposes F=mg
1a. Called apparent weight
15
Q
Tension
A
- Pulling force in a cable
