Draw a velocity - time graph for an object traveling at a constant 5 m/s
horizontal line through v = 5
100
What are the typical units for force?
Newtons
100
What two things are required of a vector?
magnitude and direction
100
The force due to gravity is always ????, never repulsive
attractive
200
Average acceleration = change in ?? / change in time
velocity
200
Draw a velocity - time graph for an object that starts at rest and is constantly accelerating in a positive direction
positive slope through zero
200
a. What two forces are acting on a skydiver?
b. What happens when they are equal?
a. gravity and air resistance
b. terminal velocity
200
Which of these is not a scalar:
distance, mass, acceleration, temperature?
acceleration
200
a. A ball is thrown straight up. What is the acceleration at the top of the arc?
b. What is the vertical velocity at the top of the arc?
a. 10 m/s^2
b. zero
300
A car going 50 km/hr will go how far in 4 hours?
200 km
300
The slope of a velocity - time graph is equal to ??
The acceleration
300
If the net force on an object is zero, what can it not be doing?
accelerating
300
What is the graphical method of adding vectors called?
Head to tail method
300
Astronauts in the Space Station are not really "weightless". Why do they seem to be so?
They are in freefall
400
How many minutes will it take a car going 100 km/hour to travel 350 km?
210 minutes
400
The area under a velocity - time graph is equal to ???
distance
400
A 5000 kg truck collides head on with a 1000 kg car. Which vehicle receives the most force?
They both experience the same force.
400
A vector can be broken down into two perpendicular c--------- vectors
component
400
How fast will a 15kg brick dropped off the Empire State Building be traveling after 3 seconds?
30 m/s
500
A ball dropped off a 125m cliff will take how long to hit the ground?
5 seconds
500
Draw the distance - time graph of a constantly accelerating object that starts at rest
Curves up, starting at zero
500
Two forces act on an object: 5N in the positive X direction and 7N in the positive Y direction. What is the magnitude of the net force
8.6 N
500
A cat runs 6m east and 8m north. What is the length of the resultant vector?
10m
500
What is the magnitude of the net force acting on a 20 kg rock thrown up at an initial velocity of 17m/sec at a point halfway to the top of it's path? (neglecting air resistance). Note: the rock is painted purple.