Vocabulary
The SI unit that is used to measure time is the ____.
second
What is the maximum resultant possible when adding a 6-N force to a 11-N force?
17-N
A ball is thrown straight upward at 5 m/s. Ideally (no air resistance), the ball will return to the thrower's hand with a speed of _____.
5 m/s
A girl pulls on a 7-kg wagon with a constant force of 14 N. What is the wagon's acceleration?
2 m/s^2
Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at 30 miles per hour?
the large truck
What is needed to describe a vector quantity?
_________ and __________
Magnitude and direction.
A 20-N force and a 35-N force act on an object in opposite directions. What is the net force on the object?
15-N
A bike travels at a constant speed of 3.5 m/s for 20 seconds. How far did it travel?
70 m
How much force is needed to accelerate a 2.0-kg rock to an acceleration of 4.0 m/s^2?
8-N
A ball is moving at 7.0 m/s and has a momentum of 49.0 kg·m/s. What is the ball's mass?
7 kg
A standard for comparison that helps to ensure that the experimental result is caused by the condition being tested is the ____.
Control
Which has more mass, a kilogram of feathers or a kilogram of iron?
Neither-they both have the same mass.
Suppose a small plane can fly at 210 km/h relative to the surrounding air. Suppose also that there is a 20 km/h tailwind. How fast does the plane's shadow move across the ground?
230 km/hr
A 14-N falling object encounters 8 N of air resistance. What is the net force on the object?
6-N
A 50-kg child on a 1.5 kg skateboard is traveling at 7.0 m/s. What is the resultant momentum?
360.5 kg m/s
The prefix kilo- means ____.
1000
A gymnast whose weight is 520 N hangs from the middle of a bar supported by two vertical strands of rope. What is the tension in each strand?
260-N
What is the resultant of a 12-unit vector and 16-unit vector at right angles to each other?
20 units
When an object reaches terminal velocity its acceleration is _____.
0 m/s^2
Compared to a sports car moving at 30 miles per hour, the same sports car moving at miles per hour has ________ as much momentum. (How many times more?)
2x more
twice as much
The variable plotted on the horizontal or x-axis is called the ____.
Independent variable
A minivan starts from rest and after 7 seconds it is moving at 42 m/s. What is the minivan’s average acceleration?
6 m/s^2
You drop a rock off of the top of a 45 m tall building. How long does it take before it hits the ground?
About 3 s
You pull horizontally on a 50-kg crate with a force of 250 N and the friction force on the crate is 150 N. The acceleration of the crate is
2 m/s^2
A 2 kg blob of putty moving at 4 m/s slams into a 6 kg blob of putty at rest. What is the speed of the two stuck-together blobs immediately after colliding?
1 m/s