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Physical Science
Test 1
| Question | Answer |
|---|---|
| Aristotle believed that natural laws could be understood by | Logic |
| In contrast to Aristotle's way of explaining nature, Galileo relied on | Experiment |
| The scientist to first introduce the concept of inertia was | Galileo |
| A kilogram is a measure of an object's | Mass |
| Compared with the mass of a certain object on Earth, the mass of the same object on the Moon is | the same |
| A 1-kg mass at Earth's surface weighs about | 10 N |
| An object weighs 30 N on Earth. A second object weighs 30 N on the Moon. The object with the greater mass is the one on | the Moon |
| A 50-N object falling in air experiences 30 N of air resistance. The amount of net force on the falling object is | 20 N |
| A man weighing 800 N stands at rest on two bathroom scales so that one scale shows a reading of 500 N. The reading on the other scale is | 300 N |
| A bucket of cement is raised by a rope at constant speed at a construction site. The upward force on the bucket supplied by the rope is | equal to the force of gravity |
| Nellie runs the length of a 100-yard football field in a time of 20 seconds. Her average running speed is | 5 yards/s |
| When a ball increases in speed by the same amount each second, its acceleration | is constant |
| A space probe in remote outer space continues moving | even though no force acts on it |
| When dishes remain on a table when you yank the tablecloth beneath them, you're demonstrating | Inertia |
| A hockey puck slides across a frozen pond. If ice friction and air resistance are neglected, the force needed to keep the puck sliding at constant velocity is | 0 N |
| The net force on any object moving at constant velocity is | Zero |
| A given net force propels an object along a straight-line path. If the net force were doubled, its acceleration would | Double |
| If an object's mass decreases while a constant force acts on it, the acceleration | Increases |
| A car has a mass of 1000 kg and accelerates at 2 m/s2. What is the magnitude of the force exerted on the car? | 2000 N |
| A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration? | 3 m/s2 |
| A 10-kg block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block is | 1 m/s2 |
| A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is | 10 times as much as the force on the 1-kg book |
| How many forces act on an upwardly tossed coin when it gets to the top of its path? | one- the force due to gravity |
| Drop a rock from a 5-m height and it accelerates at 10 m/s2 and strikes the ground in | 1 second |
| A rock is thrown vertically upward. At the top of its straight-line path, its velocity is | 0 m/s |
| f an object falls with constant acceleration, the velocity of the object must | Continually change by the same amount each second |
| A ball is thrown vertically into the air. Because of air resistance, its time coming down compared to its time going up is | More |
| A skydiver who weighs 500 N reaches terminal velocity at 90 km/h. The air resistance on the skydiver is | 500 N |
| When a skydiver of mass 100 kg experiences air resistance of 400 N, her acceleration is | 0.6 g |
| A person is attracted toward the center of Earth by a 500-N gravitational force. The force of attraction of Earth toward the person is | 500 N |
| An archer shoots an arrow. If the action force is the bowstring on the arrow, the reaction is | the arrow pushing on the bowstring |
| Arnold Strongman and Suzie Small each pull on opposite ends of a rope in a tug-of-war. The greatest force on the rope is exerted by | the same for both |
| An object in motion will continue in motion with | Momentum |
| A heavy truck and a small truck roll down a hill. Neglecting friction, at the bottom of the hill the heavy truck has greater | Momentum |
| A ball is moving at 4 m/s and has a momentum of 48 kg·m/s. What is the ball's mass? | 12 kg |
| The distinction between impulse and force involves | the time the force acts |
| It is correct to say that impulse is equal to | the change in momentum |
| A 1000-kg car moving at 10 m/s that brakes to a stop in 5 s has an average braking force of | 2000 N |
| The conservation of momentum is closely related to | Newton's 3rd law of motion |
| Two identical freight cars roll without friction towards each other on a level track. One car rolls at 2 m/s and the other car rolls at 1 m/s. After the cars collide, they couple and roll together with a speed of | 0.5 m/s |
| A 30-kg girl and a 25-kg boy face each other on friction-free roller blades. The girl pushes the boy, who moves away at a speed of 1.0 m/s. The girl's speed is | 0.83 m/s |
| An object lifted 10 m gains a certain amount of potential energy. If it is lifted 20 m, its gain in potential energy is | Twice as much |
| A music console is pushed a distance of 2 m with a force of 20 N. The work done on the console is | 40 J |
| A 2-kg mass that weighs 20 N has 40 J of potential energy relative to the ground. What is its height? | 2 meters |
| A car moves 4 times as fast as another identical car. Compared with the slower car, the faster car has | 16 times the kinetic energy |
| A car moving at 50 km/h skids 20 m with locked brakes. How far will it skid if its initial speed is 150 km/h? | 180 meters |
Created by:
akozlowski