Definitions
The turning effect produced by a force
What is torque?
Energy due to motion.
What is kinetic energy
How much kinetic energy does a 2 kg discus have if its velocity is 20 m/s?
m = 2kg, v = 20 m/s; KE=? KE=1/2mv2
400 J
A weightlifter is attempting a biceps curl with a 200 N barbell. The moment arm of the barbell about the elbow joint is 40 cm. What torque is created by the barbell about the elbow joint?
What is 80 Nm
The biggest organ in the human body.
What is skin
The product of force and the amount of displacement in the direction of that force
What is work?
Potential energy from an object’s position relative to the earth.
What is gravitational potential energy
Bill lifts a 1000 N barbell 1.5 m in 1.0 s, while Bob lifts a 1400 N barbell 2.0 m in 2.0 s. Whose lift was more powerful?
Bill's lift
A weightlifter is attempting a biceps curl with a 200 N barbell. The moment arm of the barbell about the elbow joint is 40 cm. The moment arm of the elbow flexor muscles is 4 cm. How much force must be produced by these muscles to hold the 200 N barbell in static equilibrium?
What is 2000 N
Animal has one of the highest blood pressures.
What is a giraffe
The capacity to do work.
Energy caused by the deformation of an object.
What is strain energy
Which bowling ball has more energy, a 5 kg ball rolling at 4 m/s or a 6 kg ball rolling at 3 m/s?
5kg ball moving 4 m/s
What is the net torque when you are holding a 10 lb weight 1 ft from your elbow (producing a clockwise torque) and your biceps is generating a 50 lb force with a moment arm of 3 in. (producing a counterclockwise torque)?
Proper units for Torque can be N*m but also ft*lbs!
What is 2.5 ft·lb
This animal's tongue wraps around its brain to prevent it from getting concussions when looking for food.
What is woodpecker
The rate of doing work.
What is power?
The perpendicular distance between the line of action of the force and a line parallel to it that passes through the axis of rotation.
What is moment arm
At the top of a giant swing on the gymnastics high bar, Candy’s velocity is 1 m/s, and she is 3.5 m high. If Candy’s mass is 50 kg, what is her total mechanical energy at this instant? Remember, total mechanical energy is sum of potential and kinetic energy.
v = 1 m/s, h = 3.5 m, m = 50 kg; Sum of E?
KE=1/2mv2 and PE = mgh
1742 J
The Achilles tendon inserts on the calcaneus (the heel bone). If the force generated by the muscles attached to the Achilles tendon is 3000 N and the moment arm of this force about the ankle joint axis is 5 cm, what torque is created by these muscles about the ankle joint?
F = 3000N, r = 5 cm or 0.05 m; T = F*r
T = 3000N(0.05m)
T = 150 Nm
This animal is sometimes fed a magnet to catch metal hardware like barbed wire, fencing, etc before it continues passing through the rest of its digestive tract.
What is a cow
Two kinds of forces applied directly through the center of gravity of an object and not directly through the center of gravity of an object. (Provide two kinds of forces)
What is centric and eccentric forces?
The capacity of an object to return to equilibrium or to its original position after it has been displaced.
What is stability
A 600 N volleyball player lands from a spike attempt and immediately jumps up to try for a block. When she first contacts the ground, her velocity is 3 m/s downward, and then as she leaves the ground for the block her velocity is 4 m/s upward. Her kinetic energy at first contact is...?
275 J
Cole is trying a biceps curl and attempting to lift a 150 N dumbbell. The moment arm of this weight about his elbow joint is 25 cm. The force created by the elbow flexor muscles is 2000 N. The moment arm of the elbow flexor muscles is 2 cm. Is Cole able to lift the weight with this amount of force in his flexor muscles?
40.0 Nm > 37.5 Nm
Tm > Tw
Cole is able to lift the weight.
Animal that can regenerate its heart tissue after injury.
What is Zebrafish