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ICP: Chapter 12
Practice Test Questions
| Question | Answer |
|---|---|
| The SI unit of force is the | newton |
| What relationship is correct for N? | 1 N = 1 kg x m/s^2 |
| When an unbalanced force acts on an object, | the object accelerates |
| When a pair of balanced forces acts on an object, the net force that results is | equal to zero |
| As you push a cereal box across a tabletop, the sliding friction acting on the cereal box | acts in the direction opposite of motion |
| An open parachute increases air resistance of a falling sky diver by | increasing surface area |
| Projectile motion is caused by | the downward forward force of gravity and an initial forward velocity |
| The property of matter that resists changes in motion is called | inertia |
| An orange might roll off your cafeteria tray when you stop suddenly because of | the orange's inertia |
| According to Newton's second law of motion, the acceleration of an object equals the net force action on the object divided by the object's | mass |
| If a force of 12 N is applied to an object with a mass of 2 kg, the object will accelerate at | 6 m/s^2 |
| Your weight equals your | mass times the acceleration due to gravity |
| The acceleration due to gravity on the surface of Mars is about one third the acceleration due to gravity on Earth's surface. The weight of a space probe on the surface of Mars is about | one third its weight on Earth's surface |
| Newton's third law of motion describes | action and reaction forces |
| What is conserved when two objects collide in a closed system? | momentum |
| What is the momentum of a 50-kilogram ice skater gliding across the ice at a speed of 5 m/s? | 250 kg x m/s |
| What force is responsible for the repulsion between two positively-charged particles? | electric |
| When opposite poles of two magnets are brought together, the poles | attract each other |
| Which universal force acts only on the protons and neutrons in a nucleus? | strong nuclear |
| Which of the following universal forces is the weakest? | gravitational |
| As an astronaut travels far away from Earth, her weight | decreases because gravity decreases |
| The gravitational force between two objects increases as mass | increase or distance decreases |
| The force that keeps an object moving in a circle is called | centripetal force |
| The centripetal force acting on a satellite in orbit a. acts as an unbalanced force on the satellite b. changes the direction of the satellite c. is a center-directed force d. all of the above | d |
| The type of force measure by a grocery store spring scale is ____________. | weight |
| The sum of all the forces acting on an object is called the _________________. | net force |
| If the forces acting on an object produce a net force of zero, the forces are called _____________________. | balanced forces |
| The force that opposes the motion of objects that touch as they move past each other is called ______________. | friction |
| It usually takes more force to start an object sliding then it does to keep an object sliding because static friction is usually _______________ than sliding friction. | stronger |
| The two forces acting on a falling object are gravity and _______________. | air resistance (drag) |
| When a falling object reaches terminal velocity, the net force acting on it is __________. | zero |
| The path of motion of a thrown javelin is an example of ______________ motion. | projectile |
| The tendency of an object to resist any change in its motion is called ______________. | inertia |
| The acceleration of an object is equal to the net __________ acting on the object divided but the object's __________. | force; mass |
| The force of gravity acting on an object is the object's ______________. | weight |
| When you push on a wall, the _____________ pushes back on you. | wall |
| In a closed system, the loss of momentum of one object _____________ the gain of momentum of another object. | equals |
| The observation that a charges object can attract or repel other charged objects led scientists to conclude that there are __________ types of charges. | 2 |
| The universal force that is effective over the longest distance is _____________________. | gravitational or gravity |
| How can an arrow be used to represent the size and direction of a force? | length of arrow = size of force point of arrow = direction of force |
| What happens to the magnitude of the fluid friction acting on a submarine as the submarine's speed increases? | the fluid friction increases |
| Figure 12-1 shows the paths followed by three balls. Each ball started moving at the same time. Ball A was dropped and balls B and C were thrown sideways. Compare the times for each ball to reach the ground. | they will reach the ground at the same time |
| What is the direction of the net force on a falling sky diver before she reaches terminal velocity? After she is falling at terminal velocity? | down; there is no net force |
| How can you double the acceleration of an object if you cannot alter the object's mass? | double the force |
| How are the size and direction of action-reaction forces are related? | size is equal opposite in direction |
| A billiard ball with a momentum of 20 kg x m/s strikes a second ball at rest and comes to a complete stop. What is the change in momentum of the second ball? | 20 kg x m/s |
| Compare the speed of a moving golf ball with the speed of a moving bowling ball if both balls have the same amount of momentum. | the bowling ball is moving at a much slower rate than the golf ball |
| Which of the universal forces acts only on the protons and neutrons in the nucleus of an atom? | strong nuclear |
| What is the primary cause of Earth's ocean tides? | gravitational force of the moon |
| A tow truck exerts a net horizontal force of 1050 N on an 760 kilogram car. What is the acceleration of the car during this time? | 1.38 m/s^2 |
| The mass of a newborn baby is 3.5 kilograms. What is the baby's weight? ( The acceleration due to gravity at Earth's surface is 9.8 m/s^2) | 34.3 N |
| A 38 kg canoe broke free of its dock and is now floating downriver at a speed of 2.2 m/s. What is the canoe's momentum? | 83.6 kg x m/s |
| A small engine causes a 0.3 kg model airplane to accelerate at a rate of 11 m/s^2. What is the net force on the model airplane? | 3.3 N |
Created by:
dakota_thornell2
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