**Evans SPH 3U1**

**Physics Grade 11**

**Unit 1: Kinematics**

**Note 1: Intro to Kinematics **

Reference: Chapters 1.1, 1.2

**Definitions:**

**Mechanics**
- study of the motions of objects and the forces that act on them

**Kinematics**
- study of the motion of objects

**Dynamics**
- study of the forces acting on moving objects

**Statics
**- study of forces acting on objects at rest

Let's look at Kinematics:

**Uniform
Motion** - movement in a straight line at constant speed.

**Non-Uniform
Motion** - movement involving changes in speed and/or direction

**Scalar
Quantity** - a physical quantity described by a number and a
unit. (i.e. speed, time, work, length)

**Vector
Quantity** - a physical quantity described by a number, a unit
and a direction. Proper vector notation has an arrow above the symbol (
). Examples are displacement, velocity,
force, acceleration.

**Distance**
- the length of the path an object travels

**Position
**- the distance and direction of an object from a reference
point (
).

**Displacement**
- the change in the position of an object ()

**Example
1:** A students runs five 10 metre laps. What is the distance
she travelled? What is the displacement?

**Example
2:** A student trvels 100. m [E}, 50. m [S] and then 50. m[N].
What is a) the distance travelled?

*b)
the displacement?*

**Speed
**- the distance travelled divided by the time (scalar)

**Velocity**
- the rate of change of position (vector)

**Average
Speed** - total distance traveled divided by the total time
taken.

**Average
Velocity** - the displacement (i.e. change of position) divided
by the time interval.

*See
Example 1 page 8*

Do following examples in group circular solving:

**Example
3:** What distance will a plane travel during 30 seconds if the
speed it is traveling at is 360 km/h?

**Example
4: **A rabbit rungs 92m[E] in 12 seconds, 143m[N] in 18 s,
55m[S] in 9.0 s, rests for 10s, runs 27m[W] in 5.0 s. What is the
average speed of the rabbit?

**Example
5:** A duck travels with uniform motion from a position of 2.0
km[N], to a position of 7.0 km [N], to a position of 20 km south in
0.50 h. Find the duck's

*a)
distance*

*b)
speed*

*c)
displacement*

*d)
velocity*

**Example
6:** The turtle and the hare have a race around a track. The
distance around the track from the start/finish line is 200m. The hare
finishes in 40 s and the turtle in 7.8 hours. What is the average
velocity of each animal?

**Assign
directions properly / Understand negatives in kinematics (Chpt 1.3, 2.2)**

**Analyze
negative Velocity. **

Pg 13 #2,3,4,5bd,6