Speed, Distance, Time
This is the formula used to calculate speed.
speed = distance ÷ time
This is the definition of acceleration.
The rate of change in velocity over time.
This is the term for a testable prediction in an experiment. Usually an if... then... statement.
Hypothesis
Convert 167cm to meters.
1.67m
What are the two acceptable units for speed?
m/s and km/h
If a car travels 150 km in 3 hours, this is its average speed.
50km/hr
If a car speeds up from 0 to 60 km/h in 10 seconds, this is its acceleration in km/h/s.
This variable is deliberately changed in an experiment.
Independent Variable
A toy car travels 1.2 m in 2 minutes. What is its average speed?
0.6m/s
In a distance time graph, what does it mean when the line is flat?
The object is stationary
This is the time it takes to travel 60 km at 20 km/h.
3 hours
This is the SI unit of acceleration.
m/s2
This is the variable that is measured or observed.
Dependent Variable
A person walks 300 meters in 5 minutes. What is their average speed in m/s?
1 m/s (300 ÷ 300 seconds)
What is the formula used to calculate speed of an object when using light gates?
A runner covers 400 meters in 50 seconds. This is their speed in m/s.
A cyclist slows down from 15 m/s to 5 m/s in 5 seconds. This is their acceleration.
-2 m/s2
This is the term for factors kept the same to ensure a fair test.
Control Variables
A car decelerates from 25 m/s to 500 cm/s in 4 seconds. What is its acceleration?
–5 m/s²
An object travels through light gates spaced 5 cm apart in 0.02 seconds. What is the speed of the object in m/s?
2.5 m/s (0.05 ÷ 0.02)
A train travels at 90 km/h for 2.5 hours. This is the total distance covered.
225 km
This line on a graph shows a constant acceleration over time.
a straight upward diagonal line
An experiment aims to investigate the effect of number of wheels on a vehicle's speed. What are the variables?
Independent:
Dependent:
1 Control:
Independent: Number of wheels on the vehicle
Dependent: Vehicle speed (m/s)
1 Control: vehicle weight, launch height, etc
A car accelerates from 100 cm/s to 30 m/s in 5 seconds. What is its acceleration?
4 m/s²
The difference between instantaneous speed and average speed.
Instantaneous speed is the speed at a specific moment; average speed is total distance divided by total time