PHYSICS-1305
CH-2
Name: _________________________________________
HOMEWORK CHAPTER-2: DESCRIBING MOTION
Circle the correct answers
1-
If you drive 300 kilometers in 2 hours, what is your average speed?
a) It cannot be calculated.
c) 150 km/h
b) 300 km/h
d) zero
2-
What are the units for speed?
a) kilograms
b) centimeters
c) meters per second
d) meters per second2
e) newtons
3-
How long would it take to fly across the US (a distance of 3000 miles) at 500 mph?
a) 5 hours
c) 15 hours
b) 6 hours
d) 30 hours
4-
How far could you travel in 3 hours at an average speed of 80 km/h?
a) 27 km
c) 83 km
b) 80 km
d) 240 km
5-
What is a speed of 30 m/s in mph? (1 mile = 1.6 km)
a) 30 mph
b) 42 mph
c) 48 mph
d) 67 mph
e) 1080 mph
What is a speed of 30 mph in m/s? (1 mile = 1.6 km)
a) 13 m/s
b) 16 m/s
c) 30 m/s
d) 48 m/s
e) 68 m/s
6-
7-
What is the difference between speed and velocity?
a) The two are the same.
b) Velocity relates to instantaneous speed, but not to average speed.
c) Velocity is the speed and the direction the object is traveling.
d) Velocity relates to invisible objects like atoms, while speed relates to visible objects
like cars.
8-
A vector quantity is
a) a quantity with both a magnitude and a direction.
b) a quantity that measures speed.
c) a collection of vectors all in one place.
d) a quantity that measures time.
e) a quantity that measures distance.
9-
Your average speed will be the same as your magnitude of average velocity if you
a) return to where you started.
b) go forward and then backward past where you started.
c) move in one direction the entire time.
d) move along a circle.
PHYSICS-1305
CH-2
10-
An object is accelerating when the
a) object is standing still.
b) rate of change of the object’s velocity is zero.
c) object is slowing down.
d) object is moving at a constant rate.
11-
If a sports car can accelerate from zero to 60 mph in 5 s, what was the sport car’s average
acceleration?
a) zero
d) 60 mph/s
b) 5 mph/s
e) 300 mph/s
c) 12 mph/s
12-
How fast is a ball falling 1s after it is dropped?
a) 5 m/s
b) 10 m/s
c) 15 m/s
d) 20 m/s
e) 25 m/s
How fast is a ball falling 2 s after it is dropped?
a) 5 m/s
b) 10 m/s
c) 15 m/s
d) 20 m/s
e) 25 m/s
13-
14-
A ball is thrown vertically upward with a speed of 30 m/s. How long does it take the ball to
reach the top of its path ?
a) 1 s
d) 4 s
b) 2 s
e) 5 s
c) 3 s
15-
A ball is thrown vertically upward with a speed of 30 m/s. How high does it go?
a) 5 m
d) 45 m
b) 15 m
e) 90 m
c) 30 m
16-
A ball is thrown vertically upward. What is the acceleration of the ball at the
very top of its path ?
a) zero
c) 10 m/s2
2
b) 5 m/s
Problems:
1.
Convert a speed of 65 miles per hour into km per hour, and meters per second
PHYSICS-1305
CH-2
2.
Convert an acceleration of 9.8 m/s2 into km/hr2, and miles/hr2
3.
A good athlete can run 100 m in 11 seconds. What is the speed in m/s, km/hr and
miles/hr.
4.
A car speeds up from 10 mph to 60 mph in 40 s. what is the acceleration in m/s 2 and
miles/hr2.
5.
How high will a ball reach, if it is thrown vertically upwards with a speed of 40 m/s.
PHYSICS-1305
CH-2
6.
A ball dropped from a tall building reaches the ground after 3 s. How tall is the building?
7.
A ball dropped from a tall building of height 100 m. After how much time will it hit the
ground?
8.
A ball is thrown upwards at a speed of 30 m/s. After how much time will it fall to the
ground?