Speed Flashcards
What is speed measured in
Metres per second
How do you calculate speed
Speed = Distance ÷ Time
What is meant by the average speed
Total distance ÷ Total time
What is meant by instantaneous speed
Speed at a certain time
What is relative motion
The difference between the speeds of two moving objects, or of a moving and stationary object
What does a distance time graph look like
Distance on the Y axis
Time on the X axis
What does a curved line show on a
distance-time graph
Speed is changing / Accelerating
What is gas pressure
The force exerted by gas particles when they collide with a surface
State 2 ways you can increase gas pressure
Increase the temperature
Decrease the volume
What does it mean for a gas to be compressed
Squashing the particles into a smaller place
What is atmospheric pressure
Pressure caused by the collision of air molecules that produce a force on an area
What happens to the atmospheric
pressure if you go higher up? Why?
It decreases because gravity pulls the particles down
What happens to the atmospheric
pressure if you go to sea level? Why
It increase as there are more particles as gravity pulls them down
Explain why a lower atmospheric pressure higher up can be bad for people
Less oxygen so climbers cannot breathe
What is liquid pressure
The pressure produced by collisions of particles in a liquid
Can you compress a liquid
No they are uncompressable
Why are dams thicker at the bottom than at the top
Liquid pressure is lower down as there is more water above it pushing down
What happens to the amount of liquid pressure if you go deeper into the liquid
It increases
Why do some objects float
The upthrust is greater than the weight
Why do some objects sink
The weight is bigger than the upthrust
