Cada pergunta deste Quiz é cronometrada.
What can a force do?
Change the shape of an object
Make an object disappear
Change an object's state of rest or motion
Create energy
What is the unit of force?
Pascal, Pa
Newton, N
Siemens, S
Becquerel, Bq
True or false? Every force has an equal and opposite force.
True or false? The resultant force is the product of all forces acting upon an object.
Which of these situations could occur if the resultant force was zero?
The object would remain stationary
The object would accelerate
The object would decelerate
The object would move at constant speed
Which of these situations could occur if the resultant force was not zero?
How many laws of motion did Newton create?
One
Two
Three
True or false? Force, mass and acceleration are linked by the equation F = ma.
What could you do to increase the acceleration of an object?
Increase the force
Decrease the force
Increase the mass
Decrease the mass
True or false? The thinking distance is the sum of the stopping distance and the braking distance.
Which factors increase thinking distance?
Adverse road conditions
Tiredness
Speed
Poorly maintained vehicle
Influence of alcohol or drugs
Which factors increase braking distance?
True or false? The gravitational field strength on Earth is roughly 100N/kg.
What force is exerted on objects falling in a fluid?
Fluid force
Friction
Drag force
What is the terminal velocity of an object?
The speed of an object just before it lands on the ground
The speed of an object which is guaranteed to damage it or kill it (if it is alive)
The speed of an object at which weight and drag force are balanced
True or false? An elastic object stays permanently deformed, even when the forces deforming it are removed.
True or false? Hooke's law states that the extension of a spring is directly proportional to the force applied, providing that the limit of proportionality is not exceeded.
What does k stand for in F = ke?
Force applied, N
Extension, m
Spring constant, N/m
True or false? Using a wind deflector increases the amount of fuel needed.
True or false? Speed cameras measure the time it takes for a car to travel over a set distance and then the speed is calculated.
