LINEAR MOTION. Chapter 2. Motion. Everywhere – people, cars, stars, cells, electricity, electrons Rate = Quantity/time How fast something happens. Linear Motion. Motion on a straight path Scalar- Distance and speed Vector – Displacement and velocity. Motion is Relative.
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The longer the time period measured, the more it leads to calculating an average velocity.
Refer the adjoining figure and calculate the distance between the two signals?
Reason:Distance d = df – di
Here, df = 8 m and di = 3 m
Therefore, d = 8 m 3 m = 5 m
Δl = l f – l i
Δt = t f -t i
v = Δl = l f – l i
Δt t f - t i
a – acceleration (m/s^2)
v – velocity (m/s)
t – time (s)
Problem – What is the acceleration of a car the screeches to a stop from 96.54 km/h in 3.7 seconds?
Slope = acceleration
Mean speed = vav = ½ (vi + vf)
Area of a retangle = m/s x s = Meters
s = ½ (vi + vf) t
Problem- A bullet is fired with a muzzle speed of 330m/s down a 15.2 cm barrel. How long does it take to travel down the barrel?
Problem – What is the cheetah’s acceleration if it goes 0 to 72 km/hr in 2.0 seconds?
- How far will it go to be moving 17.9 m/s?
Elapsed Time Instant. Speed (m/sec)
= 10 m/s/s = m/s2
Unit – meter/second/second
V instantaneous = at
vinstantaneous = gt
distance = ½ gravity x time2
d= ½ gt2
Linear - directly proportional
Slope is constant = acceleration
Slope is variable = Speed