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WorksheetsFriction and Circular Motion
Total questions: 32
Worksheet time: 33mins
Name
Class
Date
1.
A car traveling at 15 m/s on a flat surface turns in a circle with a radius of 25 m. What is the centripetal acceleration of the car?
a)
2.4 x 10-2 m/s2
b)
0.60 m/s2
c)
9.0 m/s2
d)
zero
2.
Which of the following terms means "center seeking"?
a)
centrifugal
b)
centrifuge
c)
centripetal
d)
centenarian
3.
Which of the following is the unit for centripetal force?
a)
J
b)
m/s2
c)
kg⋅m/s
d)
N
4.
What happens to the centripetal force exerted on an object if you triple the velocity?
a)
it increases to 3X
b)
it decreases to 6X
c)
it increases to 6X
d)
it increases to 9X
5.
Centripetal acceleration always points
a)
in the direction of the object's motion
b)
in the opposite direction of the object's motion
c)
towards the center of the circle
d)
towards the outside of the circle
6.
Bruno the bat flies at a speed of 0.5 m/s in circle of radius 1 m. What is his acceleration?
a)
0.25 ms-2
b)
0.5 ms-2
c)
1 ms-2
d)
2 ms-2
7.
What is the force that causes centripetal acceleration when a car goes around a curve?
a)
Friction
b)
Gravity
c)
Normal
d)
Tension
8.
If the gravitational force between the Earth and the Sun were suddenly switched off, the path of the Earth would be
a)
toward the sun.
b)
away from the sun.
c)
a straight line in the direction it was moving.
d)
a spiral out and away from the sun.
9.
A car travels with a constant speed in a circle. The net force on the car is
a)
zero.
b)
directed forward.
c)
directed toward the center.
d)
directed outward, away from the center.
10.
A 0.5kg ball is whirled in a horizontal circle with radius 0.5m and a speed of 1m/s. Calculate the Centripetal Force on the ball.
a)
0.5N
b)
1.0N
c)
2.0N
d)
2.5N
11.
A test car moves at a constant speed around a circular track. If the car is 48.2 m from the track's center and has a centripetal acceleration of 8.05 m/s2, what is the car's tangential speed?
a)
19.7 m/s
b)
5.99 m/s
c)
0.17 m/s
d)
388.01 m/s
12.
Friction is a force that acts in an ___________ direction of movement.
a)
similar
b)
opposite
c)
parallel
d)
west
13.
Sally experiences-
a)
Rolling Friction
b)
Kinetic Friction
c)
Fluid Friction
d)
Static Friction
14.
Which type of friction occurs when objects are not moving?
a)
static
b)
sliding
c)
fluid
d)
rolling
15.
The amount of friction depends on the weight of the objects pressing together.
a)
True
b)
False
16.
When two surfaces rub, the irregularities of one surface get caught on those of the other surface?
a)
True
b)
False
17.
What are 2 factors that determine the amount of friction between 2 objects?
a)
Force and roughness between surfaces
b)
hills and valleys and how smooth or rough the surface is
c)
Amount of force and amount of surface the comes in contact
d)
The force and the weight exerted on the surfaces
18.
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
19.
A
box takes 40 N to start moving when the coefficient of static friction is
.54. What is the weight of the box?
a)
81 N
b)
18 N
c)
98 N
d)
74 N
20.
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
21.
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
22.
What is the direction of the velocity at point B, if the ball is revolving clockwise?
a)
up
b)
right
c)
down
d)
left
23.
If the radius of the string is .3 meters long and the stopper makes 5 revolutions per second, what is the speed of the stopper? (Hint: C=2πr)
a)
9.4 m/s
b)
6.8 m/s
c)
11.7 m/s
d)
3.5 m/s
24.
A 10kg car travels at a constant speed of 20.0 m/s around a horizontal circular track. Which diagram correctly represent the direction of the car's velocity (v) and the direction of the centripetal force (Fc) acting on the car at a particular moment?
a)
b)
c)
d)
25.
The time taken for one complete circuit is called the...
a)
Period
b)
Frequency
c)
Angular velocity
26.
FN=100N, Ff=20N
a)
μ=5.0
b)
μ=0.2
c)
μ=1.2
d)
μ=0.1
27.
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
28.
Calculate the mass of an object if it took 20 N to rotate it in a circle with a radius of 2 meters with a velocity of 4 m/s
a)
4.1 kg
b)
3.6 kg
c)
2.5 kg
d)
1.8 kg
29.
You are moving a ball in a circle using 72 N of centripetal force. What would the force be if you doubled the radius of the circle.
a)
18 N
b)
36 N
c)
72 N
d)
144 N
30.
What is the relationship between centripetal force and the mass of an object?
a)
direct
b)
inverse
c)
exponential
d)
inverse squared
31.
What is the net force?
a)
0 N
b)
10 N
c)
25 N
d)
5 N
32.
What is the net force and in what direction will the block move?
a)
40 N Right
b)
60 N Right
c)
60 N Left
d)
40 N Left
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