2D Motion
Quiz
•
Science
•
11th Grade
•
Hard
+3
Standards-aligned
Lisa Thompson
FREE Resource
25 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
How long is the ball in the air?
3s
4s
5s
6s
Answer explanation
In trajectory problems we assume the displacement is zero (since the ball travels up and then falls back down)
If the initial vertical velocity is Viy = 30 m/s and the acceleration due to gravity is -10 m/s^2.
y = Viy(t) + 1/2a(t^2)
0 = 30 m/s (t) + 1/2 (-10 m/s^2)(t^2)
0 = 30 m/s(t) - 5m/s^2(t^2)
5 m/s^2(t^2) = 30 m/s(t)
t = 6s
2.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
A boat travels across a 200 meter wide river. The boat is travelling at 8 m/s and is travelling straight across the river. The river's current is 2 m/s.
How long does it take for the boat to cross the river?
15 s
20 s
25 s
30 s
Answer explanation
The distance formula is
x = Vix(t) where x is the distance, Vix is the velocity on the x axis and t is time
Filling in the knowns:
200 m = 8 m/s (t)
Divide both sides by 8
25 = t
3.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
A boat travels across a 200 meter wide river. The boat is travelling at 8 m/s and is travelling straight across the river. The river's current is 2 m/s.
How far does the boat travel down the river?
40 m
50 m
60 m
80 m
Answer explanation
The boat takes 25 seconds to cross the river
x = Vix (t) 200 = 8 m/s (t)
divide both sides and we get
25s = t
If the current is 2 m/s this will push our boat 2 meters per second for 25 seconds
y = Viy (t) y = 2 m/s (25)
y = 50m
4.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
The cow travels 10 m north, 20 m east, 30 m south and 10 m west.
What is the displacement of the cow?
22 m down and to the right
22 m down and to the left
50 m up and to the right
50 m up and to the left
Answer explanation
On the y axis the cow moves
10 north and 30 south or
y = +10 - 30 for -20
On the x axis the cow moves
20 east and 10 west or
x = +20 -10 for +10
So the cow would move -20 south and +10 north
a^2 + b^2 =c^2
20^2 + 10^2 = c^2
400 + 100 = c^2 or c^2 = 500
Square root for for c = 22.3
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
An object that is traveling east at a constant rate has
velocity, but neither acceleration nor speed.
speed, but neither velocity nor acceleration.
speed and velocity, but no acceleration.
acceleration and speed, but no velocity.
6.
MULTIPLE CHOICE QUESTION
1 min • 12 pts
A dog and a cat are about to fight, running towards each other, both at 12 m/s. What are their velocities relative to each other?
12 m/s
24 m/s
0 m/s
6 m/s
Tags
NGSS.MS-PS2-1
7.
MULTIPLE CHOICE QUESTION
1 min • 12 pts
A train is moving at a velocity of 15 m/s East. A passenger at the back of a train throws a baseball with a speed of 15 m/s West. What is the velocity of the baseball relative to the ground? (In other words: how fast does a person on the ground see the ball move?)
30 m/s East
15 m/s West
0 m/s
30 m/s West
Tags
NGSS.MS-PS3-1
NGSS.MS-PS3-5
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