Speed Flashcards
Write down the equation used to calculate the speed of an object.
Speed = distance / time
How is the speed equation rearranged to find the distance travelled by an object?
Distance = speed x time
How is the speed equation rearranged to find the time taken for an object to travel a given distance?
Time = distance / speed
A car travels 20 metres in 5 seconds. Calculate the speed of the car.
4 m/s
A bike is travelling at 2m/s for 7 seconds. How far does it go?
14 m
A walker travels 30 metres in 1 minute. What is her average speed?
0.5 m/s
Two cars are travelling towards each other at 20m/s. What is their speed relative to each other?
40m/s
A bus is travelling at 15m/s and a car is travelling at 25m/s in the same direction. What is the speed of the car relative to the bus?
10m/s
What does a distance-time graph show?
The distance travelled by an object over time.
What does a straight line on a distance-time graph represent?
A constant speed.
What does a horizontal (flat) line on a distance-time graph represent?
A stationary object.
How would you show an object that is speeding up on a distance-time graph?
A steepening curve.
What does the slope of the line on a distance-time graph represent?
The speed of the object.
The steeper the line on a distance-time graph, the ________ the object is moving.
Faster
How would you show an object that is speeding up on a distance-time graph?
A curve that is levelling off.
True or false: Air resistance and water resistance are non-contact forces.
False.
Air resistance and water resistance are both types of _________.
Drag
Give two factors that can increase the drag acting on an object.
The speed of the object and the surface area of the object.
Explain explain why the drag force on an object increases with the object’s speed.
The object collides with the air particles more frequently and with more force.
Describe how the drag force on an object can be reduced.
Streamlining reduces the drag force. The air flows smoothly around the object, reducing drag.
