Newton's Laws

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