PS Unit 1 - Force & Motion
2nd
"A net force acting on an object causes the object to accelerate in the direction of the net force." This is Newton's ____ Law.
1st
"An object will move at a constant velocity unless an unbalanced force acts upon it." This is Newton's ____ Law.
20 kg
A 500 N force is applied to a 25 m/s2 object. The mass of the object is ____.
-7m/s2
A car goes from 16 m/s to 2 m/s in only 2 s. What is the car's acceleration?
negative, positive
A car slowing down as it is approaching a red traffic light has a ____________________ acceleration; when the light turns green, the car's acceleration is ____________________.
9 m/s
A car travels a distance of 99 meters in 11 seconds. What is the average speed of the car?
Since the hose is at rest, it tends to stay at rest.
A firefighter feels the hose pushing backwards onto him as he uses it to put out a fire. What is the most likely cause of this?
15 km/hr
A group of bike riders took a 4 hour trip. During the first 3 hours, they traveled a total of 50 km, but during the last hour they traveled only 10 km. What was the group's average speed for the entire trip?
zero
A horizontal (flat) line on a velocity vs. time graph shows ____ acceleration.
800 N up
A man weighing 800 N is standing on a chair. In order to support the man, what force is the chair exerting?
-6 m/s2
A skateboarder is traveling 12 m/s down a hill. The skateboarder crashed and slid to a stop in 2.0 seconds. What was the rider's acceleration?
480 mi
A speed boat travels with an average speed of 120 mi/hr. The speed boat travels for 4 hrs. How far does the speed boat travel?
The rock and feather fall at the same rate.
A student drops a feather and rock at the same time from Mrs. Anthony's window. If air resistance wasn't a factor, what should she observe?
reference point
An indicator that orients you when describing motion is called the ________.
40 N
Calculate the force on an object that has a mass of 10 kg and an acceleration of 4 m/s2
-10.0 m/s2
Find the acceleration of a car that goes from 55 m/s to 5 m/s in 5.0 s.
11 s
How long will it take an object traveling at 10 m/s to reach a distance of 110 meters?
greater than
If a dog slips out of his house and very quickly runs one mile to chase squirrels at the park and then runs back home, his distance is _____ his displacement.
zero
In this velocity vs. time graph, the person at point B has ________ acceleration.
Car 1
The graph represents the change in velocity of four cars over a period of 10 hours. Which line represents the car with the smallest acceleration?
terminal velocity
The highest velocity a falling object will reach is ______.
masses and the distance between them
The size of the gravitational force between two objects depends on their ____.
instantaneous speed
The speed you read on a speedometer is ____.
air resistance
The upward force on an object falling through the air is ____.
speed and direction
The velocity of an object must include both a ____________________ and a ____________________.
a pencil
Which item has the least inertia?
The swimmer pushes backwards on the water and the water pushes with an equal but opposite force back on the swimmer.
Which of the following best describes how a swimmer moves through the water?
the object is slowing down
Which statement about the movement of an object with negative acceleration could be true?
