Velocity Vocab and Units
Velocity Problems
Acceleration
Kinematic Equations
Free Fall
Motion Graphs
100
Meters are the units of what?
What is distance or displacement?
100
A school bus takes .530 hrs to reach the school from your house. If the displacement of the bus is 10.1 km east then what is the velocity of the bus?
What is 19km/h
100
This is the acceleration equation.
What is a = v/t
100
A racing car reaches a speed of 42 m/s. It then begins a uniform negative acceleration, using its parachute and braking system, and comes to rest 5.5 s later. Find the distance that the car travels during braking.
What is 120 m?
100
What is the acceleration due to gravity in m/s^2
What is 9.8 m/s^2 or approximately 10m/s^2
100
The slope of a position time graph
Velocity
200
meters/second are the units of this value.
What is velocity.
200
If Ildam rides his bike in a straight line for 15 mins with an average velocity of 12.5 km/h south, how far has he ridden?
What is 3.1 km?
200
A car accelerates uniformly from rest to a speed of 6.6 m/s in 6.5 s. Find the acceleration of the car.
What is 1.01 m/s^2
200
A motorbike accelerates uniformly from a velocity of 6.5 m/s west to a velocity of 1.5 m/ west. If the acceleration was 2.4 m/s^2 east, how fr did it travel during the acceleration?
What is 7.4m.
200
A robot drops a camera off the rim of a 239 m high cliff on Mars where the free fall acceleration is -3.7 m/s^2.
a. Find the velocity with which the camera hits the ground.
b. Find the time required for it to hit the ground.
What is
a. -42 m/s
b. 11 s
200
The slope of a velocity time graph
Acceleration
300
If an object is speeding up, slowing down, or changing direction it is said to be
What is accelerating?
300
Simpson drives his car with an average velocity of 48 km/h to the east. How long did it take him to drive 144 km on a straight highway?
What is 3.00h
300
A car enters a freeway with a speed of 6.4 m/s and accelerates uniformly for 210 seconds, until it reaches, 15 m/s. What is the acceleration of this car?
What is .04m/s^2
300
An aircraft has a lift off speed of 33 m/s. What minimum acceleration does this require if the aircraft is to be airborne after a takeoff run of 240 m.
What is 2.3 m/s^2
300
A flower pot falls from a window 25.0 m above the sidewalk.
How fast is the flowerpot moving when it strikes the ground.
What is 22.1 m/s^2.
300
Describe this motion
Object moves in a positive direction at a constant speed and then stops.
400
This is the difference between velocity and speed.
What is direction?
400
If the average velocity of a duck is zero in a given time interval, what can you say about the displacement of the duck for that interval?
What is his displacement must be zero.
400
As the shuttle bus comes to a stop to avoid hitting a dog, it accelerates uniformly at -4.1m/s^2 as it slows down from 9.0m/s until rest. Find how long it took for it to stop.
What is 2.2s.
400
Two cars are moving in the same direction in parallel lanes along a highway. At some instant the velocity of car A exceeds the velocity of car B. Does this mean that car A's acceleration is greater than car B's. Explain and use examples.
What is No, If the two cars are moving in the positive direction, car A could be slowing down, while car B is speeding up even though car A's velocity is greater.
400
A tennis ball is thrown vertically upward with an initial velocity of +8.0 m/s.
a. What will the balls speed be when it get to the top of it flight?
b. How long will it take to reach its final height?
What is
a. 0 m/s
b. 0.8 s
400
When a position graph curves, and the curve becomes steeper with an increasingly negative slope,
a) describe the changes in speed.
b) determine the direction of acceleration
It is speeding up in the negative direction. Acceleration is in the negative direction
500
All falling objects experience this.
What is acceleration due to gravity?
500
Nathan accelerates his skateboard uniformly along a straight path form rest to 12.5 m/s in 2.5 s.
a. What is Nathan's acceleration?
b. What is Nathan's displacement during the time interval?
What is
a. 5.0 m/s^2
b. 16 m
500
When position graph curves become flatter, how does speed change?
Speed becomes slower.
600
Meters per second per second is the unit of this quantity
Acceleration
600
An athletes swims from the north end to the south end of a 50.0 m pool in 20 s and makes the return in 22.0 s.
a. What is the average speed for the first half?
b. What is the average speed for the second half?
What is the average speed or the round trip?
What is
a. 2.5 m/s
b. 2.27 m/s
c. 0 m/s
600
Suppose a treadmill has an average acceleration of 4.7x10^-3 m/s^s.
a. How much does its speed change after 5 mins.
b. If the treadmills initial speed is 1.7 m/s, what will the final speed be?
What is
a. 1.4 m/s
b. 3.1 m/s
600
Juan hits a volleyball so that it movevs with an initial velocity of 6.0 m/s straight upwards. If the volleyball starts from 2.0 m above the floor, how long will it take before the ball strikes the ground.
What is t = 1.5s
600
Describe the motion based on the velocity time graph.
The object begins at rest, speeds up, maintains a constant speed and then slows down all while moving in the positive direction.