Define a vector
A quantity with both size and direction, e.g. a force
Define a scalar
A quantity with size only.
Is displacement a scalar or vector quantity?
Vector
Is distance a scalar or vector quantity?
Scalar
If I ran 400m around an athletics track, what would be my displacement?
0m (I have finished where I started).
How do we represent vectors in diagrams?
As arrows, arrow have size and direction.
What is Newton's 3rd law?
Every force has and equal and opposite reaction force.
An ice hockey player pushes another ice hockey player. What will happen to the motion of both players?
Both players will move backwards due to Newton's third law.
How does a jet engine create forward thrust?
The turbine pushes air backwards. The backward force has an equal and opposite reaction, pushing the plane forwards.
How does a runner create forward thrust?
The runner pushes back on the blocks/ground. The backward force has an equal and opposite reaction, pushing the runner forwards.
If the forces on an object are not balanced, what will be happening to the object's motion?
The object will be accelerating or decelerating
If the forces on an object are balanced, what will be happening to the object's motion?
The object will be moving at a constant velocity or stationary.
What is the name of the single force on an object, which is a combination of all of the forces acting on that object?
The resultant force
The forces on this car are balanced. There is no resultant force. Therefore the car is stationary [True/false]
False, the drag force shows the car is moving at a constant velocity
Which team is winning this tug-of-war?
Blue team (Resultant force = 3N in the blue direction)
Which team is winning this tug-of-war?
Red team (resultant force = 49N in the red direction)
