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Physics Midterm Review Practice

Total questions: 47

Worksheet time: 2hrs 53mins

Name
Class
Date
1.
A vector is a quantity that had
a)
magnitude and time
b)
time and direction
c)
magnitude and direction
d)
direction and rhythm 
2.
A scalar is a quantity that had
a)
direction
b)
magnitude
c)
time
d)
color
3.
The horizontal component of a projectile's velocity is independent of...
a)
it's range
b)
time
c)
the vertical component
d)
none of these
4.
At the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height. Which ball hits the ground first? 
a)
Neither- they hit at the same time
b)
the horizontally thrown ball
c)
the dropped ball
d)
None of these
5.
T/F The vector sum is the resultant. 
a)
True
b)
False
6.

Which speed/ time graph applies to an object at rest?

a)

A

b)

B

c)

C

d)

D

7.
Which represents the acceleration of the ball?
a)
A
b)
B
c)
C
d)
D
8.
Which of the following depict the speed of the blowing ball?
a)
A
b)
B
c)
C
d)
D
9.
Is it possible for an object moving with a constant speed to accelerate?  Explain. 
A) No, if the speed is constant then the acceleration is equal to zero.  B) No, an object can accelerate only if there is a net force acting on it.  
C) Yes, although the speed is constant, the direction of the velocity can be changing.  
D) Yes, if an object is moving it can experience acceleration 
a)
A
b)
B
c)
C
d)
D
10.
An object moves with a constant speed of 30 m/s on a circular track of radius 150 m.  What is the magnitude of the acceleration of the object?    
A) zero  
B) 0.17 m/s2  
C) 5.0 m/s2 
D) 6.0 m/s2 
a)
A
b)
B
c)
C
d)
D
11.

A car is negotiating a flat curve of radius 50 m with a speed of 20 m/s. The centripetal force provided by friction is 1.2 E4 N. What is the mass of the car?

A) 500 kg

B) 1000 kg

C) 1500 kg

D) 2000 kg

a)

A

b)

B

c)

C

d)

D

12.
If you throw a baseball straight up, what is its velocity at the highest point?
a)
9.8 m/s2
b)
9.8 m/s
c)
0 m/s2
d)
0 m/s
13.
If you throw a baseball straight up, what is its acceleration at the highest point?
a)
9.8 m/s2
b)
9.8 m/s
c)
0 m/s2
d)
0 m/s
14.
What is the horizontal acceleration of a projectile?
a)
0 m/s2
b)
9.8 m/s2
15.
What is the vertical acceleration of a projectile?
a)
0 m/s2
b)
9.8 m/s2
16.

A horizontally-launched projectile arcs out and hits the ground below. The vertical displacement and the horizontal displacement are measured. What is the best equation to use to find the time the projectile was in the air?

a)

Δx→=v→x⋅Δt\Delta\overrightarrow{x}=\overrightarrow{v}_x\cdot\Delta t

b)

Δy→=v→yi⋅Δt+12⋅g⋅Δt2\Delta\overrightarrow{y}=\overrightarrow{v}_{yi}\cdot\Delta t+\frac{1}{2}\cdot g\cdot\Delta t^2

c)

v→yf=v→yi+g⋅Δt\overrightarrow{v}_{yf}=\overrightarrow{v}_{yi}+g\cdot\Delta t

d)

Δt=2⋅Δy→g\Delta t=\sqrt{\frac{2\cdot\Delta\overrightarrow{y}}{g}}

17.

A skateboarder rolls off a bridge into the river as shown. If the skateboarder was originally moving at 7.0 m/s, how much time did the skateboarder spend in the air?

a)

1.3 s

b)

0.79 s

c)

38.5 s

d)

0.70 s

e)

Not enough information given.

18.
The change in an object's position over time is best described by its _____
a)
speed
b)
velocity
c)
acceleration
d)
mass
19.
The change in an object's velocity is best described by its ____
a)
instantaneous velocity
b)
average velocity
c)
acceleration
d)
position equation
20.
In practice A of the figure, What is  the magnitude of the  resultant displacement?
a)
5 km 
b)
8 km
c)
11 km
d)
15 km
21.
Is this a scalar quantity or a vector quantity?
A deer running 15 meters per second due west
a)
Scalar
b)
Vector
22.
What is the net force?
100 N        230 N
<------        --------->
a)
30 N to the right
b)
230 N to the right
c)
130 N to the right
d)
This is a balanced force
23.
What is the SI unit of measurement for force?
a)
lbf
b)
Kilograms
c)
Newtons
d)
m/sec^2
24.

A vector has...

a)

two components (x and y)

b)

one component (y)

c)

one component (x)

d)

length and degrees

25.

In order to find the x-component of a vector with magnitute 7 m and angle 30° we will use the formula...

a)

cos (30)

b)

sin(30)

c)

7*sin(30)

d)

7*cos(30)

26.

In order to find the y-component of a vector with magnitute 7 m and angle 30° we will use the formula...

a)

cos (30)

b)

sin(30)

c)

7*sin(30)

d)

7*cos(30)

27.

What's the x-component of the following vector (13 m/s , 55°)

a)

10.64 m/s

b)

0.28 m/s

c)

7.45 m/s

d)

20 m/s

28.
The _______ of two or more vectors is the sum of the vectors.
a)
components
b)
scalar
c)
resultant
d)
magnitude
29.
How do you combine vectors if they are at a right angle to each other, and you know two sides?
a)
Multiply
b)
Divide
c)
Pythagorean Theorem
d)
Use trigonometry
30.
What law is best described by inertia?
a)
1st
b)
2nd
c)
3rd
d)
law of conservation of mass
31.
a)
1st
b)
2nd
c)
3rd
d)
law of motion
32.

What forces are on a leopard laying on a log?

a)

Fg & Fapp

b)

Fb & Fg

c)

Fg & FN

d)

Ff & FN

33.

What force opposes applied force when an object is sliding across a surface?

a)

Applied Force

b)

Normal Force

c)

Frictional Force

d)

Air Resistance

34.

What force opposes gravity when an object is on a surface?

a)

Applied Force

b)

Normal Force

c)

Frictional Force

d)

Air Resistance

35.

The forces on a couch being pushed across a living room floor are?

a)

gravity, applied force and friction

b)

buoyant force, applied force, friction and normal force

c)

gravity, applied force, friction and normal force

d)

gravity and Normal force

36.
A car traveling west in a straight line decreases its speed from 30 m/s to 23 m/s in 2 seconds. Calculate the car’s acceleration.
a)
3.5 m/s2
b)
-3.5 m/s2
c)
18.5 m/s2
d)
8 m/s2
37.

How much time does it take John to walk to his school that is 100 meters away, if he travels at a velocity of 5 m/s?

a)

20 s

b)

500 s

c)

0.1 s

d)

105 s

38.
Observe the diagram. Which set of displacement, velocity, and acceleration graphs best represent a ball rolling down an incline?
a)
Graph Set A
b)
Graph Set B
c)
Graph Set C
d)
Graph Set D
39.
While standing on a 10.0 m-high wall, Dennis tosses a rock into the water below. If Dennis throws the rock horizontally with a velocity of 3.0 m/s, how far out (displacement) from the edge of the cliff will it hit the water
a)
30 meters
b)
4.2 meters
c)
3.3 meters
d)
2 meters
40.
If the car in the picture has a mass of 2000-kg and is traveling at a constant tangential velocity, v, of 40 m/s, what will be the centripetal force if the radius, r, is 12 m? (Equation provided)
a)
6,667 Newtons
b)
266,667 Newtons
c)
600 Newtons
d)
960,000 Newtons
41.

Betsy the busy bee started at the yellow flower (A) then traveled to the blue flower (B), and next she went to the purple flower (D). She enjoyed the blue flower (B) so much she returned. Calculate Betsy’s total distance and displacement.

a)

distance = 15.4 m

displacement = 15.4 m

b)

distance = 15.4 m

displacement = 4 m

c)

distance = 9.7 m

displacement = 4 m

42.

What is the force on a 1000 kg elevator that is falling freely at 9.8 m/sec2

a)

102.04 N

b)

9,800 N

c)

980 N

d)

103 N

43.
A force of 250 N is applied to an object that accelerates at a rate of 5 m/sec2.  What is the mass of the object?
a)
100kg 
b)
1,250kg
c)
50kg
d)
5kg
44.
What happens to the velocity of a ball as it is dropped off a cliff? 
a)
It decreases at a uniform rate 
b)
It increases at a uniform rate 
c)
It is constant 
d)
It increases at a non-uniform rate
45.
A ball is thrown in the air with an initial velocity of 40 m/s. How long does it take to reach back to the point it was thrown from?
a)
4 seconds 
b)
2 seconds 
c)
6 seconds 
d)
8 seconds 
46.

A horizontally launched projectile can have a y component of initial velocity.

a)

True

b)

False

47.

Which graph could represent a velocity-time graph for an object thrown straight downwards with no air resistance?

a)
b)
c)
d)

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