Newton's Laws
Net Force
Motion Graphs
Speed and Velocity
Acceleration
100
Newton's first law is also known as the law of inertia. What is inertia?
An objects tendency to resist a change in motion
100
What is the net force on an object that is at rest?
ON
100
What shape on a distance vs time graph indicates an object is at rest?
horizontal line: The objects position is not changing.
100
What is the difference between speed and velocity?
velocity has a direction
100
If an object is accelerating, what are the three possible things it could be doing?
Speeding up Slowing down Changing direction
200
What equation is used for Newton's second law?
F=ma
200
A box is pushed with 125 N of force to the right, friction and air resistance opposed the rightward force with 25 Newtons. What is the net force on the object?
100 N to the right
200
What does an upward curving line on a distance vs. time graph indicate?
positive acceleration
200
What is the equation for speed?
s=d/t
200
what is the long-form equation for acceleration?
a= (vf-vi)/(tf-ti)
300
Newton's third law explains that if you push on a wall with 100 N of force then the wall will push back with how much force?
100N
300
Draw a Free body diagram for a skydiver that is accelerating towards the ground.
Fair up < Fgrav down
300
On a distance vs. time graph, what units are used for the x axis?
time: seconds
300
given a speed and a distance, how do you find time?
distance divided by speed
300
Starting from rest, A runner reaches her top speed of 15 m/s after running for 3 seconds. What is the runners acceleration?
5 m/s/s
400
How much force does it take to accelerate an 25kg object at 5 m/s/s
F=ma = 25kg x 5 m/s/s =125 N
400
Name all of the forces acting on a ball rolling down a hill
Gravity Normal Air resistance Friction
400
What does the slope of a line on a distance vs. time graph represent?
The speed of the object
400
what is the speed of a car that drove 1500 meters in 5 seconds?
300 m/s
400
What is the acceleration of a car that slows down from 150 m/s to 25 m/s over the course of 5 seconds?
-25 m/s/s
500
What is the acceleration of a 2kg ball thrown with 50 N of force?
25 m/s/s
500
What is the weight of a 10 kg bowling ball?
w=mg = 10kg x 9.8 m/s/s = 98N
500
What does the slope of a line on a speed vs. time graph represent?
acceleration
500
How long will it take to drive 4,500 meters if you are driving at 50 m/s?
90s
500
The Falcon Heavy rocket must reach a speed of about 11,186 m/s to escape Earth's gravity and journey deeper into space. If the rocket can only burn fuel for 2.5 minutes, what is the acceleration Falcon Heavy must achieve to escape Earth's gravity.
74.57 m/s/s
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