Physics Module 2 Exam

A free falling object has the velocity-time graph shown. What is the object's displacement between 2.0 and 4.0 s? Acceleration is constant

(Displacement = area under curve) +60m

A free-falling object's motion can be described by the velocity-time graph shown. Approximately what is the object's position at 4.0 s

(Find displacement) 80 m

At what point on the position-time graph show is the object at rest

(Slope aka velocity is 0) F

Fiona drives 18 meters east and 24 meters south. What is the magnitude of her displacement

(Use Pythagorean theorem, displacement finishes the shape) 30 meters

A boy drops a ball from an observation tower. The ball hits the ground in 5.0 s. What is the ball's velocity at the time of impact?

(Use Vf = Vi + at) 49 m/s

A car travels at uniform acceleration over a time interval of 20.0 s. It's initial velocity is 11.0 m/s and it's final velocity is 33.0 m/s. What distance did it travel during this time

(Use d = 1/2 (Vf + Vi)t) 440 m

How long does it take an acorn to hit the ground after dropping from the branch of a tree 12.5 m high

(Use d = Vi(t) + 1/2(a)t^2) 1.6 s

An object is allowed to fall freely near the surface of an unknown planet. The object falls 72 meters from rest in 4.0 seconds. The acceleration due to gravity on that planet is

(Use d = Vi(t) + 1/2at^2) 9 m/s^2

A net force of 10 N causes an object to accelerate at 2.00 m/s^2. What is the mass of the obect

(Use f=ma) 5.00 kg

Cheryl runs a race on a circular 400.0 m track. She starts running east of the starting line and stops 20.0 m west of the starting line. Her time is 8.0 x 10^1 s. What is her average speed

(Use v = d/t) 4.8 m/s

A ship travels northward at 20 km/h for 4 h. What distance did the ship travel in kilometers

(Use v = d/t) 80 km

Which portion of the velocity-time graph shown indicates a = 0 m/s^2

(Velocity is constant) B

At what point on the position-time graph shown is the object's instantaneous velocity smallest

(Velocity is slope in position-time) F

What is the car's velocity between 240 s and 300 s

(When acceleration is 0, velocity is) Constant

An object moves +5.5 m. What indicates the direction

+

Which of the following is a change in displacement over time

Average velocity

Which of the following is a vector describing how fast an object moves over a long time interval?

Average velocity

How do you find average velocity

Average velocity = displacement/time

Acceleration is

Change in speed and/or direction

A straight line with a negative slope on a velocity-time graph indicates which of the following?

Constant acceleration away from the reference

Karen runs sets in basketball practice. She starts from a line, runs 2.0 m, returns to the line, runs 4.0 m, returns to the line, runs 6.0 m, and on returning stops 1.0 meter in front of the starting line. What is her distance and displacement

Distance = 23 m, displacement = +1 m

Vector sum of 15 m, East and 9 m, West is 24 m, East True or false

False (opposite directions)

Which of the following is most appropriate to follow motion in one dimension

Graph with x and y axis

What are the set of equations called that can be used to quantify motion in the case of uniform acceleration

Kinematic equations

Which of the following is a scalars quantity? Mass Acceleration Force Velocity

Mass

The speedometer of a car moving to the east reads 55 mph. It passes another car that moves to the west at 55 mph. The cars have the same

Speed

For the velocity-time graph shown, which statement describes what happens to the velocity between approximately 10s and 11s

The lander's velocity decreases away from the reference

Which of the following best describes an object at constant velocity

a = 0

The slope of a velocity versus time graph gives

acceleration

Which of the following best describes an object at rest relative to a reference point

v = 0, a = 0