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Exercícios de forças e leis de newton · Physics Playground

ExercíciosFísica

Forças e leis de Newton

20 problemas com soluções resolvidas, de Physics e College Physics.

Começar por um aleatório

Aprenda antes: Inércia — Primeira Lei de Newton, F = ma — Segunda Lei de Newton, Ação e Reação — Terceira Lei de Newton

Physics4.3 Newton's Second Law of Motion

ExemploWhat Acceleration Can a Person Produce when Pushing a Lawn Mower?Suppose that the net external force (push minus friction) exerted on a lawn mower is 51 N parallel to the ground. The mass of the mower is 240 kg. What is its acceleration? Figure 4.6Com figura
ExemploWhat Rocket Thrust Accelerates This Sled?Prior to manned space flights, rocket sleds were used to test aircraft, missile equipment, and physiological effects on humans at high accelerations. Rocket sleds consisted of a platform mounted on one or two rails…Com figura

Physics4.4 Newton's Third Law of Motion

ExemploAn Accelerating Equipment CartA physics teacher pushes a cart of demonstration equipment to a classroom, as in Figure 4.11. Her mass is 65.0 kg, the cart’s mass is 12.0 kg, and the equipment’s mass is 7.0 kg. To push the cart forward, the…Com figura

College Physics4.2 Newton’s First Law of Motion: Inertia

ChecagemWhich has more mass: a kilogram of cotton balls or a kilogram of gold?

College Physics4.3 Newton’s Second Law of Motion: Concept of a System

Exemplo 4.1What Acceleration Can a Person Produce when Pushing a Lawn Mower?Suppose that the net external force (push minus friction) exerted on a lawn mower is 51 N (about 11 lb) parallel to the ground. The mass of the mower is 24 kg. What is its acceleration? Figure 4.7 The net force on a…Com figura
Exemplo 4.2What Rocket Thrust Accelerates This Sled?Prior to space flights carrying astronauts, rocket sleds were used to test aircraft, missile equipment, and physiological effects on human subjects at high speeds. They consisted of a platform that was mounted on one…Com figura

College Physics4.4 Newton’s Third Law of Motion: Symmetry in Forces

Exemplo 4.3Getting Up To Speed: Choosing the Correct SystemA physics professor pushes a cart of demonstration equipment to a lecture hall, as seen in Figure 4.10. Her mass is 65.0 kg, the cart’s is 12.0 kg, and the equipment’s is 7.0 kg. Calculate the acceleration produced…Com figura
Exemplo 4.4Force on the Cart—Choosing a New SystemCalculate the force the professor exerts on the cart in Figure 4.10 using data from the previous example if needed.

College Physics4.5 Normal, Tension, and Other Examples of Forces

Exemplo 4.5Weight on an Incline, a Two-Dimensional ProblemConsider the skier on a slope shown in Figure 4.13. Her mass including equipment is 60.0 kg. (a) What is her acceleration if friction is negligible? (b) What is her acceleration if friction is known to be 45.0 N?…Com figura
Exemplo 4.6What Is the Tension in a Tightrope?Calculate the tension in the wire supporting the 70.0-kg tightrope walker shown in Figure 4.17. Figure 4.17 The weight of a tightrope walker causes a wire to sag by 5.0 degrees. The system of interest here is the…Com figura

College Physics4.7 Further Applications of Newton’s Laws of Motion

Exemplo 4.7Drag Force on a BargeSuppose two tugboats push on a barge at different angles, as shown in Figure 4.22. The first tugboat exerts a force of 2.7×10^5 N in the x-direction, and the second tugboat exerts a force of 3.6×10^5 N in the…Com figura
Exemplo 4.8Different Tensions at Different AnglesConsider the traffic light (mass 15.0 kg) suspended from two wires as shown in Figure 4.23. Find the tension in each wire, neglecting the masses of the wires. Figure 4.23 A traffic light is suspended from two wires.…Com figura
Exemplo 4.9What Does the Bathroom Scale Read in an Elevator?Figure 4.24 shows a 75.0-kg man (weight of about 165 lb) standing on a bathroom scale in an elevator. Calculate the scale reading: (a) if the elevator accelerates upward at a rate of 1.20 m/s^2, and (b) if the…Com figura
Exemplo 4.10What Force Must a Soccer Player Exert to Reach Top Speed?A soccer player starts from rest and accelerates forward, reaching a velocity of 8.00 m/s in 2.50 s. (a) What was his average acceleration? (b) What average force did he exert backward on the ground to achieve this…

College Physics5.1 Friction

Exemplo 5.1Skiing ExerciseA skier with a mass of 62 kg is sliding down a snowy slope. Find the coefficient of kinetic friction for the skier if friction is known to be 45.0 N.

College Physics5.2 Drag Forces

Exemplo 5.2A Terminal VelocityFind the terminal velocity of an 85-kg skydiver falling in a spread-eagle position.

College Physics5.3 Elasticity: Stress and Strain

Exemplo 5.3The Stretch of a Long CableSuspension cables are used to carry gondolas at ski resorts. (See Figure 5.14) Consider a suspension cable that includes an unsupported span of 3020 m. Calculate the amount of stretch in the steel cable. Assume that…Com figura
Exemplo 5.4Calculating Deformation: How Much Does Your Leg Shorten When You Stand on It?Calculate the change in length of the upper leg bone (the femur) when a 70.0 kg man supports 62.0 kg of his mass on it, assuming the bone to be equivalent to a uniform rod that is 40.0 cm long and 2.00 cm in radius.
Exemplo 5.5Calculating Force Required to Deform: That Nail Does Not Bend Much Under a LoadFind the mass of the picture hanging from a steel nail as shown in Figure 5.17, given that the nail bends only 1.80 µm. (Assume the shear modulus is known to two significant figures.) Figure 5.17 Side view of a nail…Com figura
Exemplo 5.6Calculating Change in Volume with Deformation: How Much Is Water Compressed at Great Ocean Depths?Calculate the fractional decrease in volume ((ΔV)/(V0)) for seawater at 5.00 km depth, where the force per unit area is 5. 00 × 10^7 N / m^2.