Speed
What does speed measure?
Distance traveled over time
A book is at rest unless acted on by an outside force. What law?
Newton's 1st law
Velocity is speed with this?
Speed in a specific direction.
When is there is no acceleration?
Object is going a constant speed and direction or object is at rest.
What is the formula to find distance using speed and time?
distance= speed x time
What 2 quantities do we need to calculate speed?
distance and time
An objects force is equal to mass x acceleration. Which law?
Newton's 2nd law
Calculate the velocity of a boat moving northward at 40 km over 2 hrs.
40/2= 20 km/hr north
The car slows in south direction from 50 mph to 30 mph in 10 minutes. What is its acceleration in mph?
30-50/0.167 hr= -119.8 mph2 south
Whatis the formula for finding time using speed and distance?
time= distance/ speed
What is the speed of a frog that hops 5 meters/ 3 minutes?
1.67 m/min
Every action has an equal and opposite rection. Which law?
Newton's 3rd law
Calculate the velocity of a baseball going 100 meters in 3 seconds east.
100/3= 33.33 m/s east
Name three situations of acceleration
Speeding up
Slowing down
Changing directions of motion
How many seconds has a bird walked if they are going 15 meters with a speed of 5 meters/ min?
15/ 5 meters/min= 3 min x 60 sec= 180 sec.
A bird flies 35 km in 7 hrs. What is its speed in km/hr?
35/7= 5 km/ hr
A person continues to move forward in a car that suddenly brakes short. What law?
Newton's 1st law
Find the velocity of a rocket traveling north at 17500 km in 4 minutes. Find the answer in km/ sec.
17500km /240 sec= 72.9 km/ sec north
A car is heading north at 35 km/hr. It speeds up to 50 km / hr over 5 mins. What is its acceleration in km/ hr2?
50-35/ 0.083 hr =180.7 km/ hr2 north
A dog ran with a speed of 3 km/ hr away from the house in 20 mins. What was their total distance traveled in km?
distance= 3km x 0.33 hr=0.99 km
466.66666666666
A bowling ball moves with more force that a hollow plastic ball down the hill. Which law?
Newton's 2nd law
A car rides 45 km south in 15 minutes. What is its velocity in km/ hr?
45 km/ 0.25 hr= 180 km/ hr south
A tiger runs 2.5 km in 10 mins eastward. Assuming it was at rest initially, what is its accelerationin km/ hr2?
2.5-0/ 0.083 hr= 30.1 km/ hr2 east
A girl hopped 17 meters/ min for 4 mins. What was her distance traveled?
17 x 4 = 68 meters