40 Questions
What are the two most significant factors that affect the magnitude of the drag force?
The speed of the object and the object's cross-sectional area.
What is the relationship between the drag force and the speed of an object?
The drag force is proportional to the square of the speed.
What is the result of the drag force increasing until it is equal in magnitude to the weight of an object?
The object reaches terminal velocity.
What is the effect of drag forces on the net force acting on an object during free fall?
The drag forces reduce the net force acting on the object, resulting in a decrease in acceleration.
What is the relationship between the acceleration of an object and the net force acting on it?
The acceleration of the object is proportional to the net force acting on it.
What is the SI unit for force, and how is it related to the commonly used unit, the Newton?
The SI unit for force is kgms-2, and one Newton is defined as the force that will give a mass of 1kg an acceleration of 1 ms-2.
What is the formula for weight, and how does it relate to the acceleration due to gravity?
The formula for weight is W = mg, where m is the mass of the object and g is the acceleration due to gravity.
What is the difference between friction and drag, and how do they occur?
Friction is the force that arises when two surfaces rub against each other, while drag is the resistive force on an object travelling through a fluid.
What is terminal velocity, and how is it related to the drag force?
Terminal velocity is the maximum velocity an object can reach as it falls through a fluid, and it is related to the drag force, which opposes the object's motion.
What is the difference between free fall and the acceleration due to gravity?
Free fall is the motion of an object under the sole influence of gravity, while the acceleration due to gravity is the rate of acceleration of an object in free fall.
What is the formula for pressure at the base of a column of fluid?
𝑝𝑝 = ℎ𝜌𝜌𝜌𝜌𝐴𝐴
What is the principle stated by Archimedes in relation to a body immersed in a fluid?
The upthrust exerted on a body immersed in fluid is equal to the weight of the fluid that the body displaces.
What is the condition for an object to float in a fluid?
The weight of the object is equal to the weight of the fluid it displaces.
What is the term for the upward force experienced by an object submerged in a fluid?
Upthrust
When resolving forces acting on an object into their horizontal and vertical components, what must be true about the net force in each direction?
The net force in each direction must be 0.
What happens to an object if the upthrust acting up is smaller than the weight acting down?
The object will sink.
What is the point on an object where the entire weight of the object appears to act?
The centre of mass.
How can a plumb line be used to determine the centre of mass of an object?
A plumb bob is suspended from a string directly in front of the object, and a straight line along the string is drawn on to the object. The object is then suspended from another point, and another line is drawn. The intersection of these lines is the centre of mass of the object.
What can be used to determine unknown forces or distances in a system in equilibrium?
Letters to represent unknown forces or distances, along with Pythagoras' theorem and the sine and cosine rules.
What is the significance of the centre of mass in an external gravitational field?
The centre of mass and centre of gravity coincide.
What is the definition of density, and what is its SI unit?
Density is defined as the mass per unit volume, and its SI unit is kgm-3.
How is the volume of an irregular solid object measured?
The volume of an irregular solid object is measured by placing it in water inside a measuring cylinder, and the change in volume when the object is fully submerged is equal to the volume of the object.
What is the definition of pressure, and what is its unit?
Pressure is defined as the normal force exerted on a surface per unit cross-sectional area, and its unit is Nm-2 or Pascal (Pa).
What is the formula to calculate the pressure at the base of a column of fluid?
The formula is p = hρg, where p is the pressure, h is the height of the fluid column, ρ is the density of the fluid, and g is the acceleration of free fall.
What is the relationship between the weight of a fluid and the pressure it exerts?
The pressure exerted by a fluid is due to the weight of the fluid, and the two are directly proportional.
How does an object moving through a fluid experience a force opposing its motion?
It experiences a drag force, which is a frictional force that opposes motion.
What is the significance of resolving forces into components parallel and perpendicular to a slope?
It is often easier to resolve the forces into components acting parallel and perpendicular to the slope, rather than horizontally and vertically, to calculate the net force.
What is the relationship between the net force and acceleration of an object under constant force?
The net force is proportional to the acceleration of the object, as described by F = ma.
How is the weight of an object related to the acceleration due to gravity?
The weight of an object is the product of its mass and the acceleration due to gravity.
What is the state of motion where an object no longer accelerates, and the drag force equals the weight?
Terminal velocity.
What is the net force acting on an object when it reaches terminal velocity?
0
How does the distance travelled by a ball bearing in a viscous fluid change as it approaches terminal velocity?
The distance travelled between each time interval becomes the same
What is the purpose of the pulley system in the experiment to determine terminal velocity?
To increase the accuracy of the experiment
What is the formula to calculate the moment of a force?
M = F × d
What is the effect of the drag force on an object's acceleration during free fall?
It opposes the acceleration due to gravity, slowing down the object
How does the weight of an object affect its terminal velocity?
The weight of the object affects the magnitude of the drag force required to reach terminal velocity
What is the significance of the timer in the experiment to determine terminal velocity?
It allows for the measurement of time intervals
How does the velocity of an object change as it approaches terminal velocity?
It remains constant
What is the relation between the drag force and the velocity of an object during free fall?
The drag force increases with velocity
What is the purpose of the ticker timer in the experiment to determine terminal velocity?
To produce 50 dots per second on the tape, which travels at the same speed as the ball bearing
Quiz on forces in action, covering resultant force, mass, acceleration, and the formula F = ma. Also, learn about the SI unit and Newton's definition of force.
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