If I ran 400m around an athletics track, what would be my displacement?
0m (I have finished where I started).
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.
Is distance a scalar or vector quantity?
Scalar
Is gravity a contact or non contact force?
Non contact
What is Newton's 3rd law?
Every force has and equal and opposite reaction force.
Is displacement a scalar or vector quantity?
Vector
Define a scalar
A quantity with size only.
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)
Is friction a contact or non contact force?
Contact
How can the drifting astronaut get back to the shuttle (has no thrusters in their suit)
Throw the hammer away from the shuttle, the equal and opposite force will send them back to the shuttle.
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
Define acceleration
Acceleration is the rate of change of velocity
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
Is Energy a scalar or vector quantity?
Scalar (only has size)
What is the resultant force on this trolley and in which direction?
20N right
How much does Karen weigh? (g = 10N/kg)
650N
Define a vector
A quantity with both size and direction, e.g. a force
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.
Is the magnetic force a contact or non contact force?
Non contact
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
When two like charges approach, they feel a force of attraction or repulsion?
Repulsion
What is the resultant force on this trolley and in which direction?
0N
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.
How do we represent vectors in diagrams?
As arrows, arrow have size and direction.
What is the resultant force on this trolley and in which direction?
30N right
What is Newton's 2nd Law?
F = m x a
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.
What causes the Earth's tides?
The gravitational pull of the moon