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Unit 1-3 Review

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Title: Unit 1-3 Review

1
Unit 1-3 Review
2

Mass 4 kg, acceleration 5m/s2 ?
Find the weight - Fg (N)

Ft 50N
3

Mass 4 kg, acceleration 5 m/s2
Fg 40 N
What is the normal Force?

Ft 50N
4

Mass 4 kg, acceleration 5 m/s2
Fg 40 N
What is the net Force?

Ft 50N
5

Mass 4 kg, acceleration 5 m/s2
Fg 40 N, Fnet 20 N
What is the frictional Force?

Ft 50N
6

Mass 4 kg, acceleration 5 m/s2
Fg 40 N, Fnet 20 N, Ff 30N
What is µ?

Ft 50N
7
2nd and 3rd Law

Cannon and Cannonball
F F
Ma mA

8
Velocity is to speed as displacement is to (A)
acceleration (B) momentum (C) time (D) distance
9

Convert 50.1 km to m

An airplane travels at an average speed of 400
mile/hour. How many hours will it take the plane
to fly 1200 miles?

A car accelerates from a position of rest to 50
m/s in 20 seconds. Determine the rate of
acceleration in m/s2

A car accelerates from a position of rest to 50
m/s in 20 seconds. Determine the rate of
acceleration in 2.5 m/s2
Calculate the speed (m/s) of the car at the end
of the first 6 seconds.

13
The diagram shows a resultant vector, R.
Which diagram best represents a
pair of component vectors, A and B, that would
combine to form resultant vector R?
14
A person is standing on a bathroom scale in an
elevator car. If the scale reads a value greater
than the weight of the person at rest, the
elevator car could be moving (A) downward at
constant speed (B) upward at constant speed (C)
downward at increasing speed (D) upward at
increasing speed
15
The diagram represents the path of an object
after it was thrown. What happens to the objects
acceleration as it travels from A to B? (A) It
decreases. (B) It increases. (C) It remains the
same.
16
A 0.2-kg red ball is thrown horizontally at a
speed of 4 m/s from a height of 3 meters. A
0.4-kg green ball is thrown horizontally from
the same height at a speed of 8 m/s. Compared to
the time it takes the red ball to reach the
ground, the time it takes the green ball to reach
the ground is (A) one-half as great (B) the
same (C) twice as great (D) four times as great
17
The acceleration due to gravity on the surface of
planet X is 19.6 m/s2. If an object on the
surface of this planet weighs 980 Newtons, the
mass of the object in kilograms is
18
The acceleration due to gravity on the surface of
planet X is 19.6 m/s2. How far will an object
fall in 3 seconds?
19
A basketball player jumped straight up to grab a
rebound. If she was in the air for 0.80 second,
how long did it take to reach the top of her
jump?
20
A basketball player jumped straight up to grab a
rebound. If she was in the air for 0.80 second,
how high did she jump?
21
The force required to start an object sliding
across a uniform horizontal surface is larger
than the force required to keep the object
sliding at a constant velocity. The magnitudes of
the required forces are different in these
situations because the force of kinetic
friction (A) is greater than the force of static
friction (B) is less than the force of static
friction (C) increases as the speed of the object
relative to the surface increases (D)
decreases as the speed of the object relative to
the surface increases
22
A man is pushing a baby stroller. Compared to the
magnitude of the force exerted on the stroller by
the man, the magnitude of the force exerted on
the man by the stroller is (A) zero (B) smaller,
but greater than zero (C) larger (D) the same
23
A constant unbalanced force is applied to an
object for a period of time. Which graph best
represents the acceleration of the object as a
function of elapsed time?
24
The diameter of a United States penny is closest
to (A) 100 m (B) 101 m (C) 102 m (D) 103 m
25
During a 5.0-second interval, an objects
velocity changes from 25 meters per second east
to 15 meters per second east. Determine the
magnitude of the objects acceleration in m/s2.
26
A projectile has an initial horizontal velocity
of 15 meters per second and an initial vertical
velocity of 25 m/s. Determine the projectiles
horizontal displacement (in m) if the total time
of flight is 5.0 seconds.
27
A projectile has an initial horizontal velocity
of 15 meters per second and an initial vertical
velocity of 25 m/s. Determine the maximum
height of the projectile (in m) if the total time
of flight is 5.0 seconds.
28
A net force of 25 Newtons is applied horizontally
to a 10-kilogram block resting on a table. What
is the magnitude of the acceleration of the
block? (A) 0.0 m/s2 (B) 0.40 m/s2 (C) 0.26 m/s2
(D) 2.5 m/s2
29
The speed of a car is increased uniformly from 20
meters per second to 30 meters per second in 4.0
seconds. The magnitude of the cars average
acceleration in this 4.0-second interval is (A)
0.40 m/s2 (B) 10 m/s2 (C) 2.5 m/s2 (D) 13 m/s2
30
A box is at rest on an inclined plane. Which
vector best represents the direction of the
normal force acting on the box? (A) A (B) B
(C) C (D) D
31
If the magnitude of the gravitational force of
Earth on the Moon is F, the magnitude of the
gravitational force of the Moon on Earth is (A)
smaller than F (B) larger than F (C) equal to F
32
Which term represents a scalar quantity? (A)
distance (B) force (C) displacement (D) weight
33
An apple weighing 1 Newton on the surface of
Earth has a mass of approximately (A) 1101
kg (B) 1100 kg (C) 1101 kg (D) 1102 kg
34
In which situation is the net force on the object
equal to zero (mechanical equilibrium)? (A) a
satellite moving at constant speed around
Earth in a circular orbit (B) an automobile
braking to a stop (C) a bicycle moving at
constant speed on a straight, level road
(D) a pitched baseball being hit by a bat
35
A 10.0-kilogram mass are held at rest on a
frictionless 30.0 incline by force F. What is
the approximate magnitude of force F? (A) 9.81
N (B) 85.0 N (C) 49.1 N (D) 98.1 N
36
The graph shows the velocity of a race car moving
along a straight line as a function of time. What
is the magnitude of the displacement of the car
from t 2.0 seconds to t 4.0 seconds? (A)
20 m (B) 40 m (C) 60 m (D) 80 m
36
37
Which vector diagram represents the greatest
magnitude of displacement for an object?
38
A child is flying a kite, K. A student at point
B, located 100. meters away from point A
(directly underneath the kite), measures the
angle of elevation of the kite from the ground as
30. Determine the height, AK, in meters of the
kite.
39
A child is flying a kite, K. A student at point
B, located 100. meters away from point A
(directly underneath the kite), measures the
angle of elevation of the kite from the ground as
30. A small lead sphere is dropped from the
kite. Calculate the amount of time required for
the sphere to fall to the ground.
40
A car traveling on a straight road at 15.0 m/s
accelerates uniformly to a speed of 21.0 m/s in
12.0 seconds. What is the acceleration in m/s2?
41
A golf ball is hit with an initial velocity of 15
m/s at an angle of 35 degrees above the
horizontal. What is the vertical component of the
golf balls initial velocity in m/s?
42
A golf ball is hit with an initial velocity of 15
meters per second at an angle of 35 degrees above
the horizontal. What is the horizontal component
of the golf balls initial velocity?
43

Goofy the clown is working in Lost Wages wants
to jump off the top of the Bellagio which is
155-m tall and land in the pool which is 21-m
away from the base of the hotel.
How many seconds will Goofy be falling?

Goofy the clown is working in Lost Wages wants
to jump off the top of the Bellagio which is
155-m tall and land in the pool which is 21-m
away from the base of the hotel.
t 5.6 s
How fast will Goofy need to run (m/s) so he does
not hit the concrete between the hotel and the
pool?

For his next stunt, Goofy wants to be shot out of
a cannon and land in a barrel of water. Goofy
will leave the cannon at 100 m/s at an angle of
45o.
What is Goofys vertical velocity as he leaves
the cannon?

For his next stunt, Goofy wants to be shot out of
a cannon and land in a barrel of water. Goofy
will leave the cannon at 100 m/s at an angle of
45o.
vv 70.7 m/s
How many seconds will it take Goofys to reach
his maximum height?

For his next stunt, Goofy wants to be shot out of
a cannon and land in a barrel of water. Goofy
will leave the cannon at 100 m/s at an angle of
45o.
vv 70.7 m/s, t 7.1 s
What is the minimum height for the tent so Goofy
does not scrape the top?

For his next stunt, Goofy wants to be shot out of
a cannon and land in a barrel of water. Goofy
will leave the cannon at 100 m/s at an angle of
45o.
vv 70.7 m/s, t 7.1 s, y 250 m
What is Goofys horizontal velocity (m/s) as he
leaves the cannon?

For his next stunt, Goofy wants to be shot out of
a cannon and land in a barrel of water. Goofy
will leave the cannon at 100 m/s at an angle of
45o.
vv 70.7 m/s, t 7.1 s, y 250 m
vH 70.7 m/s
How far from the cannon does the barrel of water
need to be placed?

In a plane that goes 310 m/s the pilot wants to
fly directly north when the wind is blowing at
155 m/s from the east.
(a) In what direction must he head the plane?

In a plane that goes 310 m/s the pilot wants to
fly directly north when the wind is blowing at
155 m/s from the east.
(a) In what direction must he head the plane?
Angle 30 degrees
(b) How fast will the plane be going north?

An airplane descending to the runway at 250 m/s
is going at an angle of 22o with the horizontal.
Find
(a) Its horizontal velocity (m/s)

An airplane descending to the runway at 250 m/s
is going at an angle of 22o with the horizontal.
Find
(a) Its horizontal velocity
vh 232 m/s
(b) Its vertical velocity
.

A rock is thrown horizontally at 25 m/s from a
roof that is 75 m high. How many seconds does it
take to hit the ground?

A rock is thrown horizontally at 25 m/s from a
roof that is 75 m high. How long does it take to
hit the ground?
t 3.9 s
How far does the rock go horizontally before
hitting the ground?