Falling objects eventually reach terminal velocity – where their resultant force is zero. Stopping distances depend on speed, mass, road surface and reaction time.
When will a skydiver be falling at terminal velocity?
When air resistance is greater than weight
When air resistance is equal to weight
When air resistance is less than weight
Why does opening a parachute slow down a skydiver?
Increased surface area increases air resistance
Increased surface area decreases air resistance
Increased surface area decreases weight
Which word describes the forces on an object moving at a constant speed?
If a resultant force acts on an object, what happens to its motion?
There is no change in speed
The object accelerates in the opposite direction to resultant force
The object accelerates in the same direction as resultant force
Which of these statements about Newton's Third Law of motion is correct?
The forces are always contact forces
The forces act on the same object
The forces act on two different objects
Why might an air track be used in the acceleration experiments?
To reduce friction
To ensure the glider travels in a straight line
To be able to attach the pulley
Which of these is not a hazard in the acceleration experiments?
Burns from hot apparatus
Electrical fault with the equipment
Masses falling to the floor
What is the relationship between acceleration and force?
Acceleration is directly proportional to force
Acceleration is inversely proportional to force
Acceleration is not proportional to force
What is the relationship between acceleration and mass?
Acceleration is directly proportional to mass
Acceleration is inversely proportional to mass
Acceleration and mass are not proportional
Which of these would not increase braking distance?
The road being icy