Motion in 1-Dimension (Objects that are moving in the x direction or y direction only!)
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Transcript of Motion in 1-Dimension (Objects that are moving in the x direction or y direction only!)
Motion in 1-Dimension
(Objects that are moving in the x direction or y direction only!)
Variables:
• Time: How long an object does something (sec)
• Distance: How far an object travels (m)• Velocity: How fast an object travels (m/sec)– Vi= Initial velocity
– Vf= Final velocity
• Acceleration: How the speed of an object changes over time (m/sec2)
Acceleration• Acceleration- For most of our problems, you will need to
know the acceleration…
Object falling towards the Earth’s surface a = __________That means that as an object falls towards the Earth, its speed is:
If the object is not falling, we need to calculate the
acceleration using an equation.
The Equations:1. ** 3. 2. 4.
How do I know which equation to use? Is the velocity constant? __________________ If yes- use #1
If not, use any of the other 3 that you have enough information to solve.
Tips for Solving Problems:• Anything down is ______________________________
• Often you know some of the velocities right awayIf an object starts at rest, Vi = __________________
If an object stops, Vf = ________________If you throw an object up, what is its speed at the top?
_____
• If an object is dropped, we know 2 things:Vi = _____________________ a = ____________________
• Time up = Time down (If thrown and caught at same height)(If you throw an object up and it takes 6 sec to land back in your hand,
how long did it take to go up? ________________
Problem 1: Tommy drops a bottle from a height of 1.4 meters. How long will it take to reach the ground?
Given:
Unknown:
Equation:
Problem 2: Pikachu is battling Chimcharm. If Pikachu accelerates from rest at a rate of 1.5 m/s2, what will his final velocity be when he gets 25 meters away?
Problem 3: Megatron is trying to catch up to Optimus Prime after a battle against the Decepticons. He gets on a motorcycle and reaches a velocity of 16 m/s. Suddenly he realizes he is going to hit a brick wall (63 meters away) which he is unable to turn away from. He shuts the motorcycle off and coasts to a stop. Calculate the deceleration he will have to undergo in order to stop just before the wall. (deceleration is just a negative acceleration)
Problem 4: Spongebob (as a caveman) drops a rock off a cliff. If it takes 3.5 seconds for the rock to hit the ground, calculate
a) the velocity at which the rock is traveling just before it hits the ground in m/s and in miles per hour.
• b) the height of the cliff.