Speed/Velocity/Acceleration
What is the formula for calculating speed and acceleration?
s=d/t
a=Vf-Vi/time
What unit is force measured in?
Newtons (N)
Action-Reaction pairs have to do with which Newton's Law?
Newton's Third Law
There are two line on a speed graph. How could you tell which lines has a higher speed?
The line with a higher speed will be steeper
(steeper slope)
What is the definition of a force?
Force is a push or pull
Explain how rockets work in terms of Newton's Third Law.
The rocket's thrust is the action; the movement of the rocket is the reaction.
Describe the difference between speed and velocity and give an example for each.
Speed is how fast an object is moving and velocity is speed in specific direction
Ex: 2 m/s, 2 m/s North
When you calculate the net force, how do you decide if you add or subtract the individual forces?
If the same direction, add. If opposite directions, subtract.
A ball rolls but comes to a stop. Does this disprove Newton's First Law?
No, Newton's first law says things continue moving UNLESS there is another force in the way. And friction is stopping the ball.
Draw the shape of each of these graphs: - Constant speed - Walk and Stop - Acceleration - Deceleration
On Paper
Let's say two middle school classes are having a tug of war. The net force turns out to be zero. Describe what is happening with the pulling forces of each class.
The two classes are pulling in the same force so the net force is zero. There is no movement.
What is Newton's First Law of Motion? And then give one example where we can see this law happening.
Object in motion will stay in motion and object at rest will stay at rest unless acted upon by a nonzero net force (or outside force).
Sketch a distance-time graph for a journey along the motorway where the driver stopped once for petrol.
On paper
Calculate the strength and direction of the net force and describe which direction the object will move
<---------- ---------->
60N 100N
100N - 60N = 40 N to the right
According to Newton's Second Law, what would happen if two same size cars collided, but one was going 70 miles per hour and the other was going 100 miles per hour?
The faster car would do more damage to the slower car because more acceleration results in more force.