Investigating Terminal Velocity
When an object falls through a fluid it accelerates until it reaches its terminal velocity. At this speed the forces acting on it are balanced.
My task is to investigate the factors that affect the terminal velocity of a falling object.
· Mass of ball bearing
· Viscosity/density of the fluid
· Surface area of ball bearing
· Texture of the balls surface
I am going to investigate how mass affects the terminal velocity.
I think that as the mass of the ball bearing increases so does the weight of the ball bearing, which requires more friction to balance the ball bearing's weight thus making the terminal velocity increase. …show more content…
The elastic bands were placed on the tube so that there are markers for the timing to be started and stopped on a fixed point.
A group of ball bearings were massed with an electric balance and an average of the ball bearings were taken. These ball bearings were massed so that an average mass could be calculated for each size of the ball bearings, by dividing the total mass of the ball bearings by the number of ball bearings.
The ball bearing was placed on the fluids surface and let to fall through the fluid.
A stop clock was started when the ball bearing reached the first elastic band and stopped when it reached the second elastic band.
The results were repeated three times for an accurate average time and any "strange results" were repeated to improve accuracy.
The results are shown in a table on the next page.
Average mass results
Ball Number of Balls Mass (g) (2dp) Average mass of one ball (g) (2dp)
A 60 1.80 0.03
B 30 3.37 0.11
C 50 22.07 0.44
D 50 44.20 0.88
E 30 61.54 2.05
Terminal Velocity Results
Average mass (g) (2dp) Distance Fallen (cm) (1dp) Time of Fall (s) (1dp) Terminal Velocity (cm/s) (1dp) Trial 1 Trial 2 Trial 3 Average
0.03 60.0 50.4 48.6 48.9 49.3 1.2
0.11 60.0 22.9 20.6 20.8 21.4 2.8
0.44 60.0 10.3 10.2 10.3 10.3 5.8
0.88 60.0 7.1 7.0 6.5 6.9 8.7
The purpose of this assignment is to work out a parachute design and investigate parachute’s drop time. Parachutes are designed to fall slowly so that the person can land safely to the ground, as shown in figure 1. Parachutes are big, but not heavy and have a larger surface area for air resistance like traps the air from escaping out of it. This is because the air pushes the parachute back up, but the force of gravity pulls the parachute to the earth.
In this lab we tested the effect of the air friction on a free fall object using a stopwatch and photogate. One of the objective of the experiment was to get one of the free falling object acceleration to be close to 9.8 meter/second sq. The reason of that objective was to see if the theory of the acceleration of any object in free fall is downward on earth have the magnitude of about 9.8 meter/second sq. or not. To accomplish this we separated this experiment in two part.
which in fact as the radius was shortened the velocity decreased. In this lab there were several sources
Finally, the frequency and the mass of the spinning object (rubber stopper) are inversely proportional to one another specifically that as the mass increases, the frequency decreases.As the spinning mass’s weight increases, it would take more force to rotate it causing it to slow down. These larger time intervals would drastically decrease the frequency as the growing mass would result in a lower frequency.
When the heavier cylinder is placed into the glass, it displaces more water since it will displace water equal to it's weight. Therefore the level of the water rises and the cylinder floats lower.
A soft-sphere experiences a different force within a moving fluid, such as drag, buoyant weight, inertia to motion changes, and electrical interaction forces with nearby pore walls (Sharma & Yortsos, 1987) (Herzig, Leclerc, & Goff, 1970) (Mcdowell-boyer, Hunt, & Itar, 1986). Therefore, these suspended particles in fluid leads to the formation of larger particle aggregates through the collision and adhesion between them and this phenomenon have been called agglomeration. Besides agglomeration, process splitting of large particle aggregates into small aggregate or single particles and called as fragmentation. Most probably these two phenomena’s of agglomeration and fragmentation took place together in a system (Henry, Minier, Pozorski, & Lefèvre, 2013). The physical mechanism that leads to clogging of channel is extremely complicated and still a lot of study is going on to understand its complexcity. The simplest cause of clogging is either particle is entering a smaller size channel as compare to particle size or there is a gradual increase in particles size, which leads to channel blockage (Goldsztein & Santamarina, 2004). Another possibility is arch formation within a channel. Once the particles are in the arching configuration, forces induced by the shear on the arch can hold the particles in place and
This Study done by McCarthy was to find out the force of an impact on a cat when landing on its feet. The formula that McCarthy used was the force (F) equals the mass (m) multiplied by the change in velocity (∆ v/t) which gives you F = m ∆(v/t ). The cat in the experiment weight about 5.37 kg, which would be used as the mass of the cat. McCarthy used a Vernier Force Plate with a plank of wood on top so they could measure force and tension of the cat landing on it. The cat was held in the same place and was dropped from five different heights, each height was tested three times. McCarthy also tested a 3.32 kg medicine ball to test an inanimate object against the cat (McCarthy
A 3 foot (91cm) diameter ball with axle bearings was made. When towed behind a boat it was found that at speeds
(2) Any lesser height, not less than eight inches, resulting in a drop contact velocity equal to the greatest probable sinking speed likely to occur at ground contact in normal poweroff landings.