Definitions
A push or a pull is
force
A force on 7N is applied in one direction. Another force of 4N is applied in the OPPOSITE direction. What is the net force?
3N
A car travels 400m in 20s. How fast is it going?
20m/s
A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the slope, its speed is 22 m/s. What is its average acceleration?
6m/s2
What is Newton's First Law of Motion?
An object at rest stays at rest unless acted upon by a nonzero net force
The combination of forces acting on an object
net force
A force of 4N is applied in one direction. A force of 4N is applied in the SAME direction. What is the net force?
8N
If you drove 50m in 10 s, what is your speed?
5m/s
A car advertisement states that a certain car can accelerate from rest to 70 km/h in 7 seconds. Find the car’s average acceleration.
10m/s2
What is Newton's Second Law of Motion?
force=mass x acceleration
A place or object used for comparison to determine if something is in motion
reference point
A force of 6N is applied in one direction. A force of 3N is applied in the SAME direction. What is the net force?
9N
You arrive in my class 45 seconds after leaving match, which is 90 meters away. How fast did you travel?
2m/s
A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. What is the lizard’s average acceleration?
2m/s2
What is Newton's Third Law of Motion?
For every action, there is an equal and opposite reaction.
The distance an object travels per unit of time
speed
A force of 2N is applied in one direction. A force of 5N is applied in the SAME direction and then a force of 4N is applied in the opposite direction. What is the net force?
3N
A plane travels 395,000m in 9000s. What was its speed?
43.8m/s
A ball is dropped from the top of a building. After 2 seconds, it’s velocity is measured to be 19.6 m/s. Calculate the acceleration for the dropped ball.
9.8m/s2
What is Newton's Law of Gravitation?
Every object in the universe attracts every other object in the universe
The rate at which velocity changes
acceleration
A force of 7N is applied in one direction. A force of 4N is applied in the same direction, and then a force of 2N is applied in the opposite direction. What is the net force?
9N
It takes Serina 0.25 hours to drive to school. Her route is 16km long. What is Serina's speed on the way to school?
64km/hr
A cyclist accelerates from 0 m/s to 8 m/s in 3 seconds. What is his acceleration ? Is this acceleration higher than that of a car which accelerates from 0 to 30 m/s in 8 seconds?
2.6m/s2 No because the other acceleration is 3.75m/s2
Using Newton's Second Law, calculate this equation: An object with a mass of 8.0kg accelerates 4.0m/s2 when an unknown force is applied to it. What is the amount of force?
32N