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REVIEW 11/16 springs, friction, inclined planes

Total questions: 55

Worksheet time: 4hrs 19mins

Name
Class
Date
1.

Are springs elastic?

a)

Yes

b)

No

2.

Which household objects have springs in them?

a)

bathroom scales

b)

bathroom tiles

c)

kitchen scales

d)

hoola hoops

3.

We measure force in

a)

newons

b)

netons

c)

newrons

d)

newtons

4.
What type of friction is not moving?
a)
static
b)
sliding
c)
fluid
d)
rolling
5.
Friction is a force that acts in an ___________ direction of movement.
a)
similar
b)
opposite
c)
parallel
d)
west
6.
A type of friction that occurs when air pushes against a moving object causing it to negatively accelerate
a)
surface area
b)
air resistance
c)
descent velocity
d)
gravity 
7.
How does friction affect speed?
a)
more friction decreases speed
b)
more friction increases speed
c)
less friction decreases speed
8.
Which of the following is an example of friction that is helpful?
a)
Brakes used on a bike
b)
Tires from a car on the road
c)
Tread on the bottom of your shoes
d)
All are examples that are helpful
9.
How can friction be reduced?
a)
reduce the force acting between the 2 surfaces
b)
reduce the roughness of the 2 surfaces coming in contact
c)
use wax, grease or oil
d)
all of the above are ways of reducing friction
10.
The amount of friction depends on the weight of the objects pressing together.
a)
True
b)
False
11.
The rougher the surface, the faster an object will travel over the surface.
a)
True
b)
False
12.

Which of the following statements is false?

a)

Friction can only slow things down

b)

Friction is never useful

c)

Friction can stop things from moving

13.
What type of friction is displayed when you move a couch across the floor?
a)
Sliding
b)
Rolling
c)
Static
d)
There is no friction
14.
Swimming fish experience-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
15.
A spring has a spring constant of 330 N/m.  How far is the spring compressed if 150 N of force are used?
a)
2.2 m
b)
0.0014 m
c)
5.0 m
d)
0.45 m
16.
Which of the following is a true statement regarding springs?
a)
The higher the value of the spring constant, the stiffer the spring.  
b)
In Hooke's law, the force exerted by the spring acts in the same direction as displacement.  
c)
Springs are designed to provide unpredictable variations in force.  
d)
The force exerted by a spring has a quadratic relationship with the displacement form equilibrium.  
17.
A force of F=500 N is applied to extend a spring.  What is the displacement x of the spring if its spring constant is k= 540 N/m?
a)
0.96 m
b)
0.93 M
c)
1.3 m
d)
1.1 m
18.
If F is force, k is spring constant and x is extension, Hooke's Law tells us that:
a)
F=k/x
b)
x=Fk
c)
k=Fx
d)
F=kx
19.
When you stretch a rubber band, you are storing __________ energy. 
a)
kinetic 
b)
potential
c)
none of the above
d)
all of the above 
20.

Question 2: Toy glider.

When a force is applied to a spring, the spring extends by 0.12 m.

The spring has a spring constant of 25 N / m.


Calculate the force applied to the spring in Newtons.

a)

3.0 N

b)

208 N

c)

0.0048 N

d)

25.1 N

21.

What is the extension of the spring?

a)

4 cm

b)

7 cm

c)

3 cm

d)

11 cm

22.

Four different springs were tested and their results were recorded in the graph below.

Which spring is the stiffest?

a)

A

b)

B

c)

C

d)

D

23.
What force should be applied to compress a spring by 0.013 m if its spring constant is k = 1900 N/m?
a)
1880 N
b)
24.7 N
c)
1900 N
d)
0.127 N
24.
A 25,000 N Car is supported by 4 springs.  If each spring is deflected by 0.040 m what is the spring constant? 
a)
160,000 N /m
b)
620,000 N/m
c)
630,000 N/m
d)
120,000 N/m
25.
A spring extends 1.5m under load 10N. What is its spring constant?
a)
0.15N/m
b)
10N/m
c)
6.7N/m
d)
15N/m
26.
A 5-newton force causes a spring to stretch 0.2 meter. What is the potential energy stored in the stretched spring?
a)
1 J
b)
0.5 J
c)
0.2 J
d)
0.1 J
27.
An unstretched spring has a length of 0.10 meters. When the spring is stretched by a force of 16 newtons, its length is increased to 0.18 meters. What is the spring constant of this spring? 
a)
0.89 N/cm 
b)
2.0 N/cm 
c)
1.6 N/cm 
d)
1.8 N/cm
28.

Spring constant is measured in

a)

N

b)

N/m

c)

m

29.

A spring with spring constant 16 N/m is compressed by 0.5 m. How much energy is stored in the spring?

a)

1 J

b)

0.25 J

c)

2 J

d)

16 J

30.

The SI unit of Spring Potential Energy is?

a)

Joules

b)

Watts

c)

Newtons

d)

meters

31.

Elastic potential energy is energy in an object that is compressed or __________.

a)

at rest

b)

stretched

c)

in equilibrium

32.
This spring has a constant of 80 N/m.  What is the magnitude of the force being applied? The spring is stretched 0.25 m
a)
20 N
b)
80 N
c)
160 N
d)
320 N
33.
 What is the force of friction between a block of ice that weighs 950 N and the ground if μ = .12? 
a)
65 N
b)
226 N
c)
175 N
d)
114 N
34.
What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N? 
a)
0.78
b)
0.51
c)
0.78 N
d)
0.58 N
35.
What are the units on the coefficient of friction?
a)
none
b)
Newtons
c)
meters
d)
kilograms
36.

The amount of friction depends on the normal force of the objects pressing together.

a)

True

b)

False

37.

FN=100N, Ff=20N

a)

μ=5.0

b)

μ=0.2

c)

μ=1.2

d)

μ=0.1

38.

When looking at friction problems, if the net force in the x-direction on an object is zero, what can we say about its acceleration?

a)

it is positive

b)

it is negative

c)

it is zero

d)

not enough information is given

39.

Normal force is

a)

Always opposite the weight

b)

Always parallel and down the incline

c)

Always perpendicular to the surface

d)

It depends on the direction of motion

40.

If an object is at rest on an inclined plane, which of the following forces is greatest?

a)

normal force

b)

friction

c)

weight

d)

Both normal force and weight are equal, so they both are the greatest.

41.
A hockey puck slides on ice at a constant velocity. What is the net force acting on the puck?
a)
Zero
b)
Equal to its weight
c)
Less than its weight but greater than zero
d)
Depends on the speed of the puck
42.

A 220-kg crate is pushed horizontally with a force of 700 N. If the coefficient of kinetic friction is 0.20, calculate the acceleration of the crate.

a)

1.02 m/s2

b)

1.22 m/s2

c)

1.42 m/s2

d)

1.62 m/s2

43.

If the mass of the block is 20.0 kg, what is the magnitude of Fgrav?

a)

170 N

b)

98.1 N

c)

196 N

d)

20.0 kg

44.

If the mass of the block is 20.0 kg, what is the magnitude of Ffrict if the block is at rest?

a)

98.1 N

b)

170 N

c)

10.0 N

d)

196 N

45.

A car travels up a hill at constant speed. Which of the following diagrams best represents the forces acting on the car at this instant?

a)
b)
c)
d)
46.
You are being pulled on a sled to the left with 50N of force.  Friction is acting on the runners of the sled in the opposite direction with 5N of force.  What is the net force of the scenario? 
a)
55N right 
b)
45N left
c)
25N left
47.
The formula for friction is :  f = μN.  The symbol μ is called 
a)
the friction force.
b)
the normal force.
c)
the coefficient of friction.
48.
The normal force is always __________ to the surface.
a)
parallel
b)
perpendicular
c)
at 45 degrees to
49.
Static friction is always less than kinetic friction.  True or false?
a)
True.
b)
False.
50.

For motion along an inclined plane, what direction does force of friction point?

a)

Always perpendicular to the surface

b)

Always down the incline and parallel to the surface

c)

Always up the incline and parallel to the surface

d)

It depends on the direction of motion

51.

7 sled dogs pull a wooden sled. The sled has a mass of 55 Kg. The frictional coefficient between the sled and snow is 0.04. What is the frictional force the dogs are fighting against? (Hint: First, calculate the Normal Force)

a)

-16 N

b)

-22 N

c)

-2.2 Kg

d)

-14 N

52.

7 sled dogs pull a wooden sled to the right with a force of 400 N. The sled has a mass of 55 Kg. The frictional coefficient between the sled and snow is 0.04. What is the acceleration of the sled? (Hint: First calculate the Net Force)

a)

-6.88 m/s^2

b)

16 m/s^2

c)

6.88 m/s^2

d)

7.27 m/s^2

53.

A 0.5 Kg hockey puck slides across an ice floor to the right. The frictional coefficient between the ice and puck is 0.01. What is the frictional force that the puck experiences? (Hint: First calculate the Normal Force)

a)

0.005 N

b)

-0.049 N

c)

0.049 N

d)

-0.005 N

54.

A truck pulls a 5,000 Kg trailer filled with watermelons as it heads north, towards Canada. The frictional coefficient between the road and the trailer's tires is 1.00. What is the frictional force opposing the trailer's motion?

a)

5,000 N

b)

49,000 N

c)

-5,000 N

d)

-49,000 N

55.

Santa’s newly-waxed, wooden sleigh, when empty, has a mass of 400 Kg. Rudolph and the crew pull the sled along the snow with a force of 1,000 N rightwards.(Meu = 0.20) What is the frictional force opposing Rudolph and friends?

a)

80 N

b)

784 N

c)

-80 N

d)

-784 N

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