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WorksheetsAP Test Dynamics
Total questions: 20
Worksheet time: 10mins
A 50.0 N box is at rest on a horizontal surface. The coefficient of static friction between the box and the surface is 0.50, and the coefficient of kinetic friction is 0.30. A horizontal 20.0 N force is then exerted on the box. The magnitude of the acceleration of the box is most nearly
0 m/s2
0.5 m/s2
1 m/s2
4 m/s2
An archer shoots an arrow straight up with a force of 24.5 N. The arrow has a mass of 0.4 kg. What is the force of gravity on the arrow?
9.8 m/s2
9.8 N
61.5 N
3.9 N
A ball of mass m is suspended from two strings of unequal length as shown above. The magnitudes of the tensions T1 and T2 in the string must satisfy which of the following relations?
T1 = T2
T1 > T2
T1 < T2
T1 + T2 = mg
When the frictionless system shown above is accelerated by an applied force of magnitude F, the tension in the string between the blocks is
F
2/3 F
1/2 F
1/3 F
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 Ө with the horizontal, as shown above. The normal force exerted on the block by the surface has magnitude
Greater than W
Greater than zero but less than W
Equal to W
zero
When an object of weight W is suspended from the center of a massless string as shown above, the tension at any point in the string is
2W cos Ө
½ W cos Ө
W/(2cos Ө)
W/(cos Ө)
A block of mass 3m can move without friction on a horizontal table. The block is attached to another block of mass m by a cord that passes over a frictionless pulley, as shown above. If the masses of the cord and the pulley are negligible, what is the magnitude of the acceleration of the descending block?
g/3
g/4
2g/3
g
Two people are pulling on the ends of a rope. Each person pulls with a force of 100 N. The tension in the rope is
0 N
50 N
100 N
200 N
The figure above shows a truck pulling three crates across a rough road. Which of the following shows the directions of all the horizontal forces acting on crate 2:
A 70 kg crate is pushed across a rough floor by a 500 N force exerted at 37 degrees below the horizontal, and the coefficient of kinetic friction between the crate and floor is 0.3. Which of the following is closest to the crate’s acceleration?
1.4 m/s2
2.9 m/s2
4 m/s2
5.4 m/s2
The horizontal wire shown on the right in the figure above will break when the tension in it exceeds the value Tmax. What is the maximum mass M that the hanging object can have without the horizontal wire breaking? (Assume the wire on the left does not break prior to the horizontal wire breaking)
A 2-kilogram block slides down a 30° incline as shown above with an acceleration of 2 meters per second squared.
Which of the following diagrams best represents the gravitational force W, the frictional force f, and the normal force N that act on the block?
A 2-kilogram block slides down a 30° incline as shown above with an acceleration of 2 meters per second squared.
The magnitude of the frictional force along the plane is most nearly
2.5 N
5 N
6 N
10 N
16 N
A push broom of mass m is pushed across a rough horizontal floor by a force of magnitude T directed at angle θ as shown above. The coefficient of friction between the broom and the floor is μ. The frictional force on the broom has magnitude
μ(mg + Tsinθ)
μ(mg – Tsinθ)
μ(mg + Tcosθ)
μ(mg – Tcosθ)
μmg
A block of mass m is accelerated across a rough surface by a force of magnitude F that is exerted at an angle φ with the horizontal, as shown to the left. The frictional force on the block exerted by the surface has magnitude f. What is the acceleration of the block?
F/m
(Fcosφ)/m
(F–f )/m
(Fcosφ–f )/m
(Fsinφ–mg)/m
A block of mass m is accelerated across a rough surface by a force of magnitude F that is exerted at an angle φ with the horizontal, as shown to the left. The frictional force on the block exerted by the surface has magnitude f. What is the coefficient of friction between the block and the surface?
f /mg
mg/f
(mg–Fcosφ)/f
f /(mg–Fcosφ)
f /(mg–Fsinφ)
A horizontal force F pushes a block of mass m against a vertical wall. The coefficient of friction between the block and the wall is μ. What value of F is necessary to keep the block from slipping down the wall?
mg
μ mg
mg/μ
mg(1 - μ)
mg(1 + μ)
The “reaction” force does not cancel the “action” force because:
The action force is greater than the reaction force.
The action force is less than the reaction force.
They act on different bodies.
They are in the same direction.
The reaction exists only after the action force is removed.
What happens to the inertia of an object when its velocity is doubled?
the object’s inertia becomes 2 times greater
the object’s inertia becomes 2 times greater
the object’s inertia becomes 4 times greater
the object’s inertia becomes 8 times greater
the object’s inertia is unchanged
Which of the following changes would increase the net acceleration of mass m down the frictionless inclined plane?
Increasing the mass m
Increasing the length of the incline plane
Releasing the mass in the middle of the inclined plane
Increasing the angle theta
