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WorksheetsAP Physics Ch. 4 Dynamics
Total questions: 25
Worksheet time: 6hrs 15mins
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 normal force to be zero?
Yes. If the surface is horizontal.
Yes. If the surface is vertical
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.
A ball of mass 2.0 kg is acted on by two forces, F1 given by x-y components (-3.0N, +2.0 N) and F2 given by x-y components (+5.0 N, +3.0 N). The magnitude of the acceleration is _____.
5.4 N @ 68.2° N of E
2.7 N @ 21.8° N of E
2.7 N @ 68.2° N of E
5.4 N @ 68.2° N of E
The SI unit of force is the
Joule
Newton
Watt
Tesla
The force needed to accelerate the rover Opportunity on Mars at 1 m/s2 in the horizontal direction is ________ the force needed to accelerate the rover while it was undergoing testing on Earth.
equal to
less than
greater than
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
A large (8,000-kg) stationary helicopter lifts a 1000-kg car straight up out of a parking lot with an acceleration of 4 m/s2. Calculate the tension in the lifting cable.
3.5 x 104 N
1.4 x 104 N
9.8 x 104 N
2.4 x 104 N
Two boxes m1 and m2 are connected by a lightweight cord and sitting on a frictionless surface. A horizontal force of 88 N pulls on box m1 and then m2 is pulled along. If the acceleration of both boxes is 2.2 m/s2 and the mass of m2 is 18 kg, find the mass of m1.
12 kg
32 kg
22 kg
40 kg
Your heart pumps 80 g of blood with each beat. The blood starts from rest and reaches a speed of 0.60 m/s in the aorta. If each beat takes 0.16 s, the average force exerted on the blood is
3.0 x 102 N
0.22 N
0.30 N
0.16 N
A bell hangs from a blue rope. A red rope attached to the side of the bell is pulled in the horizontal direction. This causes the blue rope to make an angle less than 90o with the vertical. Which of the following statements is true?
The red rope is under greater tension than the blue rope.
The red rope is under the same tension as the blue rope.
The blue rope is under greater tension than the red rope.
The tensions cannot be compared unless the mass of the bell is known.
An unknown force is applied to two unknown masses MA and MB. Their accelerations and are measured. From these data we can determine
the magnitude of F1 only.
MA and MB only
the ratio of MA to MB only.
An astronaut lands on an alien planet and drops a small lead ball with a mass of 76.5 g from the top of her spaceship. The point of release is 18 m above the surface of the planet and the ball takes 2.5 s to reach the ground. The astronaut's mass on Earth is 68.5 kg. Her mass on the planet is _____.
68.5 kg
395 kg
39.5 kg
99 kg
Camille has a catapult that launches and changes the velocity of a ball (m = 0.2 kg) from 0 to 10 m/s in one second. What is the average force that is exerted on the ball during launch?
2 N
5 N
8 N
0.2 N
If there is no friction, then the acceleration would be equal to
mg
sin(θ)mg
g
sin(θ)g
A man with a man of 81.6 kg is standing in an elevator. If the elevator rises with an acceleration of 0.5 m/s2, the force exerted by the elevator on the man will be
760 N
800 N
840 N
1000 N
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 2000 kg car with a velocity of v collides head on with a 6000 kg truck with a velocity of -v. Which vehicle experiences the greater force? Which experiences the greater acceleration?
the car and truck experience equal force and the car experiences greater acceleration
The truck experiences the greater force and greater acceleration
The truck experiences the greater force but least acceleration
The truck experiences the greater force and the car the greater acceleration
Jose is riding his skateboard and pushes off the ground with his foot. This causes him to accelerate at rate of 4 m/s2. Dave weighs 589 N. How much force did Jose push off the ground with?
589 N
64 N
240 N
320 N
