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JAMB UTME Dynamics: Force and Newton's Laws of Motion — practice questions

Explore 33 free Dynamics: Force and Newton's Laws of Motion questions in JAMB UTME Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Dynamics: Force and Newton's Laws of Motion questions and exercises with answers

Showing questions 1–30 of 33.

Dynamics is best described as the study of which of the following?Read the answer and worked solution →Which description of force is correct?Read the answer and worked solution →What does a free-body diagram show?Read the answer and worked solution →A spring is stretched a fixed distance and the force it exerts as it returns to its relaxed shape is used as a standard. What is that force called?Read the answer and worked solution →What is inertia?Read the answer and worked solution →How is the inertia of an object measured, and how does that measure behave with location?Read the answer and worked solution →Which has more mass, a kilogram of cotton balls or a kilogram of gold?Read the answer and worked solution →An object sliding across a rough table slows down and stops. What causes the slowing?Read the answer and worked solution →In practice, how are the masses of objects determined?Read the answer and worked solution →One newton of force is defined as the force needed to do which of the following?Read the answer and worked solution →What is the weight of a 1.0 kg object at the surface of the Earth?Read the answer and worked solution →A 1.0 kg mass weighs 9.8 N on Earth. What does the same mass weigh on the Moon?Read the answer and worked solution →The net external force on a lawn mower of mass 24 kg is 51 N parallel to the ground. What is its acceleration?Read the answer and worked solution →Rocket sled tests reached accelerations of 45 g. Roughly what acceleration is that in SI units?Read the answer and worked solution →How does the normal force on an object resting on an incline compare with its full weight?Read the answer and worked solution →A skier of total mass 60.0 kg is on a slope at 25 degrees to the horizontal with friction negligible. What is her acceleration down the slope?Read the answer and worked solution →The same 60.0 kg skier on the 25 degree slope now meets 45.0 N of friction. What is her acceleration down the slope?Read the answer and worked solution →Tension is best described as which kind of force?Read the answer and worked solution →A 5.00 kg mass hangs stationary from a rope of negligible mass. What is the tension in the rope?Read the answer and worked solution →A tightrope walker of mass 70.0 kg stands at the middle of a wire that sags by 5.0 degrees on each side. What is the tension in the wire?Read the answer and worked solution →What is an inertial frame of reference?Read the answer and worked solution →What may be drawn on a free-body diagram?Read the answer and worked solution →A man of mass 75.0 kg stands on a bathroom scale in a lift accelerating upward at 1.20 m/s^2. What does the scale read?Read the answer and worked solution →The same 75.0 kg man now rides the lift upward at a constant speed of 1 m/s. What does the scale read?Read the answer and worked solution →A footballer starts from rest and reaches a velocity of 8.00 m/s in 2.50 s. What is his average acceleration?Read the answer and worked solution →That footballer has a mass of 70.0 kg and accelerates at 3.20 m/s^2 with air resistance negligible. What average force did he exert backward on the ground?Read the answer and worked solution →Which particle is listed as the carrier of the electromagnetic force?Read the answer and worked solution →By approximate relative strength, which of the four basic forces is the weakest?Read the answer and worked solution →Which of the four basic forces is described as attractive only?Read the answer and worked solution →Which force dominates the motions of moons, planets, stars and galaxies?Read the answer and worked solution →

Worked practice questions

Dynamics is best described as the study of which of the following?

  1. How motion is described without its causes
  2. How energy is stored inside moving objects
  3. How forces affect the motion of objects
  4. How bodies deform under an applied load
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Correct answer: C. How forces affect the motion of objects

1. Dynamics is the study of how forces affect the motion of objects and systems. 2. Newton's laws of motion are the foundation of dynamics. 3. Describing motion without asking what causes it is kinematics, not dynamics. 4. Deformation under load and energy storage belong to other branches again. _Source: OpenStax College Physics (CC BY 4.0), Ch 4 "Dynamics: Force and Newton's Laws of Motion", section 4.1 Development of Force Concept_

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Which description of force is correct?

  1. A push or pull with magnitude and direction
  2. A scalar measuring how fast a body moves
  3. A vector with magnitude but no direction
  4. A scalar equal to the mass of a body
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Correct answer: A. A push or pull with magnitude and direction

1. A force is a push or a pull on an object with a specific magnitude and direction. 2. Because it has both magnitude and direction it is a vector quantity. 3. Forces add head to tail like other vectors, so a total force can be found graphically. 4. Any option that calls force a scalar contradicts the way forces add. _Source: OpenStax College Physics (CC BY 4.0), Ch 4 "Dynamics: Force and Newton's Laws of Motion", section 4.1 Development of Force Concept_

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What does a free-body diagram show?

  1. Only the external forces acting on a body
  2. Both the internal and external forces at work
  3. Only the internal forces inside the body
  4. The velocity and the acceleration of a body
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Correct answer: A. Only the external forces acting on a body

1. A free-body diagram illustrates all the external forces acting on a body. 2. The body itself is drawn as a single isolated point, with force vectors extending from it. 3. Internal forces within the body are left out, because only external forces affect its motion. 4. Only forces are drawn, so velocity and acceleration never appear on the diagram. _Source: OpenStax College Physics (CC BY 4.0), Ch 4 "Dynamics: Force and Newton's Laws of Motion", section 4.1 Development of Force Concept_

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