Vocabulary
this is the length and direction that an object has moved from its starting point
displacement
A baby crawls 5 km east, then turns and crawls 3 km south, what is the babies displacement?
5.8 km
what is the formula for speed?
speed= distance / time
If a car is conitnuously going 60 mph, is it true that we can with certainty that the acceleration has not changed? Why or why not?
No, because the direction can still change
This energy is known for the energy stored in an object
potential energy
all three of these, displacement, velocity, acceleration, and force, use magnitude and direction to measure. These are also known as...
vectors
An object moves 3 cm to the right, then 6 cm to the left, then 8 cm to the right. What is the object's final displacement?
5 cm to the right
what is the formula for average speed?
average speed = total distance/ total time
what is the formula for acceleration?
acceleration = final velocity - initial velocity / time
the energy that is present when an object is thrown in the air, and pauses before it descends is known as
gravitational potential energy
the rate at which an object is moving at a given instant in time
instantaneous speed
You walk 1 block to the east, then 1 block north, then 2 blocks east, then 3 blocks north, then 2 blocks west. What is your distance?
9 blocks
A car travels 32 km during the first 2 hours. Then it travels 13 km in the final hour. What is the avergae speed of the car?
15 km/hr
A falling rain drop acceleratre from 10 m/s to 30 m/s in 2 seconds. What is the acceleration?
10 m/s2
When it is raining, it can be fun to slide across the ground. However, you come to a stop. What does the energy transform to and how so?
The kinetic energy transforms into thermal energy due to the friction of the shoes against the ground, law of conservation of energy
this vector is can be changed by its speed or direction
velocity
A person walks 4 m north, then 3 m east. What is the distance and displacement?
Distance = 7 m
Displacement= 5 m
on a graph, you are given the points (4,40) and (3,30). The x axis is time in seconds and the y axis is distance in meters. Find the slope to find the velocity.
10 m/s= velocity
A certain car can accelerate from rest to 27 m/s in 9 seconds. Find the car's acceleration.
3 m/s2
What is the kinetic energy of a 30 kg rock moving at a speed of 10 m/s?
1500 joules
this is the term used to describe the rate at which velocity changes with time
acceleration
A bug walks exaclty half way around the edge of a circular cupcake with a diameter of 5 cm. What is its distance and displacement?
distance = 7.85 cm
displacement = 5 cm
You are given the 2 points (2,10) and (4, 20) on a distance vs time graph. What is the velocity?
5 m/s
When graphing acceleration, the graph can appear curved. What does this positive curved line tell you about the objects acceleration?
it traveled a greater distance than the second before, and during each second, your speed is greater than the second before.
A football is thrown across the field. It has the weight of 4 newtons, and a mass of 0.4 kg. If the football is moving at a speed of 14 m/s. It is thrown 3 m above the ground. What is the mechanical energy of the football?
51 Joules