Forces
Which characteristic of a force makes it a vector quantity?
Direction
What is the better measure of a discus throw: distance or displacement?
During a curling game, your team pushes a stone down the ice where it collides with a stationary stone near the target. Is the collision mainly elastic or inelastic?
Elastic
What term describes the rate of force application?
Power
A bar and weight plates are 100 kg. An athlete begins a squat with the bar on his shoulders (1.50 m from the floor). He lowers into a squat position until the bar is 0.50 m above the floor, then returns to the starting position. How much total mechanical work is done from start to finish?
0 (no displacement)
Which component of a contact force acts parallel to the surfaces in contact?
Friction Force
What type of motion is typically observed in sports?
General Motion
The Law of Inertia relates to which of Newton's Laws of Motion?
First Law of Motion
Work done on an object by an external force causes a change in what variable?
Energy
Where did I attend undergrad?
Transylvania University
Forces that do not act along the same line but do act through the same point are called what?
Concurrent forces
Which of the following statements correctly describes the motion of a softball thrown from first base to second base?
a. It is not affected by gravity
b. Its horizontal velocity is greater at the start of the throw than when it reaches second base
c. There is no horizontal acceleration
d. The softball does not change position
c. There is no horizontal acceleration
Compared to your body weight, how much force do you have to apply to start a pull-up?
Force > Body Weight
Positive work is the result of what type of muscle contractions?
Concentric
An 80 kg athlete training for a Spartan Race climbed a 15 ft (4.57 m) cargo net then dropped down onto mats at the base of the net.
How much potential energy did he have at the top of the cargo net?
3586.5 J
200 kg*m/s^2 is equal to how many Newtons?
200 N
Before the start of a 100-meter dash, a sprinter runs a quick practice sprint away from the finish line. As he is slowing down after finishing the practice sprint, is his acceleration positive, negative, or 0?
Positive (double negative - direction and speed are both negative, which makes acceleration positive)
What would the coefficient of restitution be if you drop a golf ball from 6 feet and it bounces to a height of 44 inches?
0.78
What kind of energy is related to deformation of an object?
Strain energy
An 80 kg athlete training for a Spartan Race climbed a 15 ft (4.57 m) cargo net then dropped down onto mats at the base of the net.
What was his velocity at the moment just before he made contact with the mats?
9.47 m/s
If a scale shows that an individual has a mass of 200 pounds, what is that individual's weight?
890 N
A sprinter accelerates uniformly from rest to 10 m/s in 4 seconds. Then, he speeds up to 12 m/s for 3 seconds. What is the sprinter’s acceleration in these 3 seconds?
0.67 m/s^2
Jimmy, a 80 kg basketball player, lands on his feet after completing a slam dunk and then immediately jumps up again to celebrate his basket. When his feet first touch the floor after the dunk, his velocity is 4 m/s downward; when his feet leave the floor 0.40 s later, as he jumps back up, his velocity is 3 m/s upward. What is the impulse exerted on Jimmy during this 0.40 s?
560 N*s
Impulse = FΔt
FΔt = mΔv
80 kg (3 m/s - (-4 m/s)) = 560 N*s
If the total energy of a ball is 100 J at the peak of its flight, what will the total energy of the ball be after it falls 10 meters and hits the ground?
100 J
What is my wife's name?
Hannah