just some terms from the practice final

### a passanger is in the rar seat of a car moving at a steady speed is at rest relative to

the front seat of the car

### a person walks 1 mile every day for exercise, leaving her front porch at 9:00 am. and returning to her front porch at 9:25 am. What is the total displacement of her daily walk?

0

### a ball is rolled uphill a distance of 5 meters before it slows, stops, and begins to roll back. The ball rolls downhill 9 meters before coming to rest against a tree. What is the magnitude of the ball's displcaement?

4 meters

### speed is the ratio of the distance an object moves to

the amount of time needed to travel the distance

### a car traveled 60 km in 2 hours, 84 km in the next hour, and then 68 km in 2 hours before reaching its destination. What was the car's average speed?

148 km/h

### a distance-time graph indicates that an object moves 100 m in 4 s and then remains at rest for 6 s. What is the average speed of the object?

10 m/s

### suppose you increase your walking speed from 1 m/s to 3 m/s in a period of 1 s. What is your acceleration?

2 m/s to the second power

### an object moving at 30 m/s takes 5 s to come to a stop. What is the object's acceleration?

-6 m/s to the second power

### an object that is accelerating may be

slowing down, changing speed, gaining speed all these are correct

### as you push a cereal box across a tabletop, the sliding friction acting on the cereal box

acts in the direction opposite of motion

### according to Newton's second law of motion, acceleration of an object equals the net force acting 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 to the second power

### 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

### what is the momentum of a 50-kilogram ice skater gliding across the ice at a speed of 5 m/s?

250 kg.m/s

### if you perform 40 joules of work lifting a 10-N box from the floor to a shelf, how high is the shelf?

4.0 m

### a small 20-kilogram canoe is floating downriver at a speed of 2 m/s. What is the canoe's kinetic energy?

40 J

### a 4-kilogram cat is resting on top of a bookshelf that is 3 meters high. What is the cat's gravitational potential energy relative to the floor if the acceleration due to gravity is 9.8 m/s to the second power?

118 J

### Which of the following statements is true according to the law of conservation of energy?

energy cannot be created, energy cannot be destroyed, energy can be converted from one form to another, all are corrct

### a naturally occurring, inorganic solid with a crystal structure and a characteristic chemical composition is a

mineral

### intense heat, intense pressure, or reactions with hot water can modify a pre-existing rock to form a

metamorphic rock

### a series of processes in which rocks are continously changed from one type to another called

the rock cycle

### what changes are involved when mud from a lake bottom turns into sedimentary rock and then into a metamorphic rock?

compaction and cementation and then heat and pressure

### the hypothesis taht the continents move slowly over Earth's surface and once were joined into one supercontinent is called

plate techtonics

### which of the following is the most likely reason that ancient observers believed taht Earth was the center of the universe?

objects in the sky appear to circle around Earth

### what led to the discovery of three more planets than those that the ancient observers knew about?

the invention of the telescope in 1600