29 Questions
What happens to the density of the atmosphere as altitude increases?
It decreases
What is the main reason for the difference in pressure between the top and bottom surfaces of a partially submerged object?
The greater pressure on the bottom surface due to the weight of the fluid above
What is the term for the resultant force upward experienced by a partially submerged object?
Upthrust
What is the difference between distance and displacement?
Distance excludes direction, while displacement includes it
What is the characteristic of the atmosphere that makes it transparent to solar radiation?
Its composition
What does a sharper gradient on a displacement-time graph represent?
Faster speed
What is the difference between speed and velocity?
Speed excludes direction, while velocity includes it
What can be calculated by drawing a tangent on a displacement-time graph?
Velocity
What does the area under a velocity-time graph represent?
Distance travelled
What does a horizontal line on a displacement-time graph indicate?
Stationary
What does a negative gradient on a velocity-time graph represent?
Deceleration
What is the reason for the gravitational attraction between two objects?
The mass of the objects
What is the unit of measurement for weight?
Newtons
What is the relationship between the mass of an object and its gravitational field strength?
The mass of an object is directly proportional to its gravitational field strength
Why does a person's weight change when they move to a different planet?
Because the gravitational field strength on the new planet is different
What is the purpose of a force meter, also known as a calibrated spring-balance?
To measure the weight of an object
What is the value of g on Earth?
9.8 N/kg
What is the unit of force in the equation F = ma?
N
What is the term for the measure of how difficult it is to change the velocity of an object?
Inertia
What is the result when a rocket exerts a force on the gases being ejected?
The gases apply a force equal in magnitude but opposite in direction on the rocket.
What is the distance travelled by a vehicle during the time it takes to react to a hazard?
Thinking Distance
What is the factor that affects the braking distance of a vehicle?
All of the above
What is the unit of momentum?
kg m/s
What is always conserved in a collision or explosion with no external forces?
Momentum
What does Newton's Second Law of Motion state?
Force is equal to the rate of change of momentum
What is the purpose of crumple zones in a car?
To absorb energy and increase the time taken for the car to stop
What is the purpose of seatbelts in a car?
To strap the passengers in and reduce the rate of change of momentum
What is the purpose of airbags in a car?
To increase the time taken for the head to stop moving
Why is braking hard dangerous?
Because it increases the rate of change of momentum, causing a large force on the passengers
This quiz covers the fundamentals of forces in physics, including electrostatic forces, gravitational attraction, normal contact force, and friction. Learn about the interactions between objects and their effects.
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