P5
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What is a contact force
A force that occurs when two objects are physically touching each other
Give an example of a contact force
Friction
What is a scalar quantity
Magnitude but no direction
Give an example of a scalar quantity
Speed,mass
What is a vector quantity
Direction and magnitude
Give an example of a vector quantity
Weight,velocity
What is acceleration
The rate at which something Increases speed
What is it measured in
M/s2
How can you calculate it
Final velocity-initial velocity /time
What is the equation for work done
Work done(J)=forcexdistance
What is work done the same as
Energy transferred
What is mass measured in
Kg
What is weight measured in
Newtons
What is the difference between mass and weight
Weight changes depending on gravitational field,it’s a vector quantity Mass does not change and is ascalar quantity
What is the equation for working out mass
Mass=density x volume
Would your weight be the same on the moon
No,as the moon has a different gravitational pull
On a Distsnce time graph,what do the flat sections,the increasing sections and the decreasing sections mean
Flat=stationary Increasing=moving away from original Decreasing=returning for original
What is the difference between speed and velocity
Speed is only magnitude where as velocity is speed and direction
What is terminal velocity and what happens to the forces when an object reaches it
Terminal velocity is when a falling object reaches it’s maximum speed.The forces acting upon it are balanced and equal
Unbalanced forces cause
Deceleration and acceleration
Balanced forces cause
Stationary or constant speed
What are the typical speeds for walking running cycling car train plane
Walking-1.5 Running-3 Cycling-6 Car-25 Train-80 Plane-500
On a Velocity time graph what do the increases flat and decreases mean
Increases-acceleration Flat-moving at a constant velocity Decrease-decelerating
What 2 things add to make stopping distance
Thinking time+brake time