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WorksheetsAP Physics 1: Dynamics Ch5
Total questions: 50
Worksheet time: 3hrs 22mins
A force of 8 N is applied to a crate so that it moves at a constant velocity of 1.5 m/s. What is the net force on the crate?
1.5 N
8 N
12N
0 N
Is it possible for the normal force to be equal to the gravitational force?
Yes. If the surface is horizontal and Fg is perpendicular to the surface.
Yes. If the surface is vertical and Fg is parallel to the surface.
No. FN will always be less than Fg
No. Fg will be less than FN.
Is it possible for the object in the diagram to be moving to the right and have this free body diagram?
Yes. It's possible that the x forces were just left off the diagram.
Yes. It could be moving at a constant velocity.
No. The FBD shows that the system is in equilibrium on both the x- and y- axis.
No. An FBD shows all F.
A force accelerates an object of mass M. The same force applied to a second body produces half the acceleration. What is the mass of the second body?
2 M
0.5 M
3 M
4 M
A net force of 36 N acts on a mass of 9 kg. The resulting acceleration is _____.
6 m/s2
9 m/s2
4 m/s2
0 m/s2
A mass of 15 kg is acted on by two forces, one of which is 15 N due east while the second one is 10 N due north. The acceleration of the mass is
1.67 m/s2, 56.3o north of east.
1.2 m/s2, 33.7 o north of east.
1.67 m/s2, 56.3o north of east.
1.67 m/s2, 33.7 o north of east.
The SI unit of force is the
Joule
Newton
Watt
Tesla
An inertial reference frame is one in which
Newton's first law describes the behavior of matter.
the law of inertia is not applicable.
there is a great deal of matter.
the object of interest is traveling in a circular path.
You are riding in an elevator that is in motion. Using a spring balance calibrated in newtons, you notice that a 10.0 kg hanging mass reads 120 N on the scale. What is the acceleration of the elevator?
9.8 m/s2 downward
4.9 m/s2 upward
2.2 m/s2 downward
2.2 m/s2 upward
The Earth pulls downward on a pingpong ball with a force of 1N. If this is the "action" force, what is the "reaction" force?
The ground exerts a force of 1N on the ping pong ball
The ping pong ball exerts a force of 1 N on the Earth
The ping pong ball pushes down on the earth with a force of 1N
The is no reaction force when a gravitational force is involved
If there is no friction, then the acceleration would be equal to
mg
sin(θ)mg
g
sin(θ)g
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?
An object in motion will stay in motion and an object at rest will stay at rest unless acted upon by an outside force. Which law does this describe
2nd law
1st law
3rd law
When there is a change in motion?
When forces are balanced
When the forces are unbalanced
Whe forces are equal
Never
In a lab, a block weighing 80 N is attached to a spring scale, and both are pulled to the right on a horizontal surface, as shown above. Friction between the block and the surface is negligible. What is the acceleration of the block when the scale reads 32 N?
2.0 m/s2
2.5 m/s2
4.0 m/s2
6.0 m/s2
A 2 kg block, starting from rest, slides 20 m down a frictionless inclined plane from X to Y, dropping a vertical distance of 10 m as shown above.
The magnitude of the net force on the block while it is sliding is most nearly
0.1 N
0.4 N
5.0 N
10.0 N
An object of mass m is initially at rest and free to move without friction in any direction in the xy-plane. A constant net force of magnitude F directed in the +x direction acts on the object for 1 s. Immediately thereafter a constant net force of the same magnitude F directed in the +y direction acts on the object for 1 s. After this, no forces act on the object. Which of the following vectors could represent the velocity of the object at the end of 3 s, assuming the scales on the x and y axes are equal?
What is inertia?
A force that attracts and repels objects.
An object in motion that was to stay in a straight path unless it is acted upon by another force.
A force that pulls objects "in" or together.
A force that is measured in Newtons.
Because of inertia, a moving object will keep ________.
at rest
moving
in one spot
inertia
A constant net force acts on an object. Describe the motion of the object.
constant non-zero velocity.
constant non-zero acceleration.
increasing acceleration.
decreasing acceleration.
A catcher stops a ball traveling at 40 m/s in a distance of 20 cm and feels a force of 600 N against his glove. What is the mass of the ball?
0.10 kg
0.15 kg
0.20 kg
0.25 kg
A 3.0-kg and a 5.0-kg box rest side-by-side on a smooth, level floor. A horizontal force of 32 N is applied to the 3.0-kg box pushing it against the 5.0-kg box, and, as a result, both boxes slide along the floor. How large is the contact force between the two boxes?
12 N
20 N
24 N
32 N
A 1000-kg barge is being towed by means of two horizontal cables. One cable is pulling with a force of 80.0 N in a direction 30.0° west of north. The second cable pulls in a direction 20.0° east of north. What should the magnitude of its pulling force be so that the barge will accelerate northward?
127 N
120 N
117 N
73.7 N
An object is being acted upon by three forces and moves with a constant velocity. One force is 60.0 N along the x-axis, the second is 75.0 N along the y-axis. What is the magnitude of the third force?
15.0 N
48.0 N
67.5 N
96.0 N
A 40.0-kg crate is being lowered by means of a rope. Its downward acceleration is 2.00 m/s2. What is the force exerted by the rope on the crate?
40.0 N
80.0 N
232 N
312 N
A 50.0-kg crate is being pulled along a horizontal, smooth surface. The pulling force is 10.0 N and is directed 20.0° above the horizontal. What is the acceleration of the crate?
0.0684 m/s2
0.188 m/s2
0.200 m/s2
0.376 m/s2
You ride on an elevator that is moving with constant downward acceleration while standing on a bathroom scale. The reading on the scale is
equal to your true weight, mg.
less than your true weight, mg.
more than your true weight, mg.
could be more or less than your true weight, mg, depending on the magnitude of the acceleration.
A person is lowering a bucket into a well with a constant speed. The force exerted by the rope on the bucket is
equal to the bucket's weight.
greater than the bucket's weight.
less than the bucket's weight, but not zero N.
zero N.
In Figure 5-1, masses m1 and m2 are such that m1 > m2 and they lay on a level, frictionless surface. We can apply a horizontal force either from the left or from the right. The contact force between masses m1 and m2 is
zero newtons.
larger when F is applied from the left
larger when F is applied from the right
the same in either case.
A ball is thrown up into the air. At the highest point in its trajectory, the net force acting on it is
equal to its weight.
greater than its weight.
less than its weight, but not zero N.
zero N.
A 40.0-kg box is being pushed along a horizontal, smooth surface. The pushing force is 15.0 N directed at an angle of 15.0° below the horizontal. What is the acceleration of the crate?
0.158 m/s2
0.362 m/s2
0.466 m/s2
0.375 m/s2
A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction. What is the tension in each cable?
231 N
400 N
800 N
2560 N
Objects with greater _________ also have greater inertia.
speed
mass
force
friction
If these boys are pulling with the same amount of force. What will happen?
The boy in blue will win.
They will not move at all.
The boy in red will win.
Both will fall down.
What is the attractive force that exists between all objects that have mass?
Weight
Mass
Gravity
Viscosity
If an object is stationary (not moving) the forces acting upon it are _____________
unbalanced
weak
balanced
Hulk Smash!
Are forces balanced or unbalanced when a marble speeds up rolling down a ramp?
Balanced
Unbalanced
What is Newton's First Law known as? The Law of
Friction
Mass
Inertia
Gravity
Newton's third law states that any action will have a(n) _______ and ______ reaction
Equal and similar
Equal and opposite
Equal and different
Greater and opposite
Why is it harder to push a van filled with bowling balls than it is to push a van with basketballs?
The mass of the car is greater than the mass of the basketballs
The mass of the bowling balls is greater than the mass of the basketballs
The van with the basketballs is bigger than the van with the bowling balls
It should be equally as hard to push the two vans
Which of the following is an example of gravitational mass?
The gravitational force exerted on an object is called the object’s .
mass
weight
volume
charge
. The sum of all the forces acting on an object is called the force.
net
gravitational
final
inertial
Acceleration due to gravity is .
980 m/s2
9.80 m/s2
9.8 m/s
0.98 m/s
The graph respresents
no motion
constant velocity
increasing velocity
decreasing velocity
Which graph represents zero acceleration (constant velocity)?
A
B
C
D
The box in the diagram is accelerating.
True
False
Not enough information is given.
A block of weight W is pulled along a horizontal surface at constant speed v by a force F, which acts at an angle of θ with the horizontal, as shown above. The normal force exerted on the block by the surface has magnitude
W - F cosθ
W + Fsinθ
W-Fsinθ
W + Fcosθ
W
Find the normal force of a 2.7 kg book resting on a surface inclined 32 degrees above the horizontal.
15.75 N
30.00 N
10.20 N
22.45 N
Match the definition:
An object's acceleration is equal to the net force acting on the object divided by its inertial mass.
Newton's 1st Law
Newton's 2nd Law
Newton's 3rd Law
Superposition Principle
