1) A stalled car has several people pushing on it, resulting in a net force acting on it.

As such, the car absolutely must...

2) After being kicked, a football is a projectile flying through the air toward the endzone.

Which of the following statements are correct about the magnitudes of the ball's velocity (v) and acceleration (a) at the highest point in its trajectory?

3) Based off the given power of 10 and SI unit, which of the following lengths must be the longest?

Group of answer choices

10¹ cm

10⁸ nm

10³ m

10² mm

10^-4 km

4) You are driving north in your car when you suddenly slam on the brakes. You feel yourself moving forward while the car comes to a stop.

In what direction does the car accelerate?

east

north

west

it is not accelerating

south

5) Fundamental quantities are those that aren't defined in terms of any other quantities and thus are measured in one of the various SI base units.

Which of the following is considered a fundamental quantity?

Group of answer choices

acceleration

time

force

work

speed

6) In science, a ______ is a concise statement summarizing a pattern found in nature that is supported by evidence from many experiments (for example, recognizing that an object's acceleration is always proportional to the net force acting on it).

7) If a mass is known to have an uncertainty of 1% and a volume has an uncertainty of 2%, then the overall uncertainty in density (which is the ratio of mass to volume, found by dividing mass by the volume) is approximately 3%.

Group of answer choices

True

False

8) No matter what, a car that is coasting will eventually come to a stop because Newton's first law tells us that an object must have a force on it to keep moving.

Group of answer choices

True

False

9) A bone is slightly shortened by compression. The relationship between the stress (the compression) and the strain (the amount of shortening) is best described using Young's modulus.

Group of answer choices

True

False

10) Alcohol consumption is known to slow reaction times, which is one reason why drunk driving is so dangerous.

As an example, consider the difference between a sober driver and a drunk driver when it comes to avoiding an accident: the sober driver may take 0.43 s before they hit the brakes whereas the drunk driver may take 1.10 s before they carry out the same action. If the drivers are initially traveling at 67.6 mph, how many meters farther will the drunk driver's car travel before the brakes are applied compared to the distance the sober driver's car travels before the brakes are applied?

Hint: 1 mi = 1609 m

11) A child falls from rest out of their treehouse. Though they fall a height of 3.26 m from the treehouse to the ground, they are not seriously injured: a cushy pile of leaves below the treehouse breaks their fall. If the pile of leaves is compressed a distance of 16.1 cm while bringing the child to a stop, what must be the magnitude of the child's average deceleration (in m/s²) after hitting the leaf pile?

12) A mosquito lands on a man's face to suck his blood. His wife notices this and tries to squish the bug by bringing her hand down at 2.46 m/s toward his face. Unfortunately, the mosquito flies away and she only hits her husband's face. This collision between hand and face brings her hand to a stop in 2.69 milliseconds. What must be the magnitude of the average contact force (in newtons) exerted on her husband's face by her hand if her hand's mass is 0.415 kg?

13) When at rest, a high school athlete's anterior cruciate ligament (ACL) is 57.0 mm long. During strenuous exercise, a stress that is, a force per unit area, F/A - of 5.5910⁶ N/m² is applied to the ligament. If the ligament's material has a Young's modulus of approximately 1.1510⁸ N/m², by how many millimeters should the athlete's ACL stretch due to the applied stress?

14) A wide receiver is running downfield when he is tackled. The sudden impact brings the wide receiver to an abrupt stop, ultimately causing the receiver's brain to slam into the inside of his skull.

a) Based off your knowledge of the physics of motion and forces, would the resulting injury most likely be to the front or the back of the brain, and why?

b) Using force and energy in your explanation, how do football helmets and pads help prevent such an injury?

15) The knee joint is formed by the tibia and femur, but there is more there than just bone: the ends of the bones are covered by a very smooth layer of cartilage, and a slippery fluid - called synovial fluid - is found in the cavity between the bones. A patient suffering from osteoarthritis loses some of the cartilage layer as well as some synovial fluid.

a) In terms of the forces acting at the joint, what is the purpose of this cartilage and synovial fluid?

b) A doctor might recommend weight loss for a patient who wants to avoid surgery for their osteoarthritis. Why would this help compensate for the loss of cartilage and synovial fluid?