# Pysical Science 1

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Test 1 Phys 1415

### Science is a body of knowledge that goes back to

D. Humankind's beginnings

B. 20 km/h

C. 1N

A. 20m/s

### A push on a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick, one would have to push with

A. 10 times as much force

### A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water

A. Is the same for each bullet

### When a scientist is dishonest and reports false information, he or she

A. gets no second chance in the scientific community

### In Science, a theory is

A. A synthesis of a large body of well-tested knowledge

### The amount of fiction that occurs when two material surfaces slide against each other depends on

C. both of these- A.how much they are pressed together and B.the "stickiness" of atoms on their surfaces

C. The gravitational attraction between you and the earth

### A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that

B. The milk carton has inertia

A. 500N

C. acceleration

D. 300N upward

C. Inertia

### Which has Zero acceleration? An object

D. all of the above- A. Moving at constant velocity B. At rest C.In mechanical equilibrium

A. Zero

### Compared with a 1kg block of solid iron, a 2kg block of solid iron has the same

E. none of these- A. Weight B. Mass C. Volume

B. 6m/s

C. 5N

C. Solids

### If you push a create across a level floor at constant speed, the friction between the create and the floor is

B. a bit more than your pushing force

D. Galileo

C. 400N

### A force is a vector quantity because it has both

B. Magnitude and direction

A. 1

### A ball is thrown upwards and caught when it come back down. In the presence of air resistance, the speed with which it is caught is

C. Less than the speed it had when thrown upwards

### A scientific hypothesis is a(n)

E.Testable assumption used to explain and observation

C. 60m/s

### A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor

B. Exactly below the midpoint of the ceiling

B. Is Zero

E. 6km/h/s

### A falling object that has reached its terminal speed continues to gain

D. Neither-A. Speed B. Acceleration

### Suppose a particle is being accelerated through space by a 10N force. Suddenly the particle encounters a second force of 10N in the opposite direction of the first force. The particle with both forces acting on it

D. Continues at the speed it had when it encountered the second force

C.10N

### A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person will get to a state of zero acceleration first?

B. The light woman

C. 10 m/s

C. 10N

D. 1500kg

### The scientific method is most effective in

D. Gaining, organizing, and applying new knowledge

### The two measurements necessary for calculating average speed are

A. Distance and time

C. Mass

B. 100m/s

### Consider drops of water that leak from a dripping faucet. As the drops fall, they

B. Get farther apart

### An object weighs 30N on Earth. A second object weighs 30N on the moon. Which has a greater mass?

B. The one on the moon

### If a non rotating object has no acceleration, then we can say for certain that it is

A. In mechanical equilibrium

### Neglecting friction, a large block of ice and a small block of ice start sliding down an incline together. The heavier block will get to the bottom

B. The same time as the light block

B. 10

D. Experiment

A. 0m/s

### An object in mechanical equilibrium is an object

D. All of the above-A. at rest B. Moving with constant velocity C. Having no acceleration

C. Double

E. 3.0

D. 6N

D. Decreases

### What is the first step in the scientific process?

A. Observe a natural phenomenon

A. The same

### The two objects of the same size, but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the

A. Heavier object

D. 500m

C. 0N

C. 3000N

C. 3 min

### If a freely falling object were somehow equipped with an odometer to measure the distance is travels, then the amount of distance it travels each succeeding second would be

C. Greater than the second before

B. 5m/s

### Two factors that greatly affect air resistance on falling objects are the size and

A. Speed of the object

### An object following a straight line path at constant speed

D. has zero acceleration

D. 0

A. Decreases

C. Zero

A. Time rates

### Compared with a 1kg block of solid iron, a 2kg block of solid iron has twice as much

D. All of these- A. Inertia B. Volume C. Mass

B. Acceleration

A. Increasing

B. The same

D. Inertia

A. weight

A. A metric ton

### Which statement is incorrect

B. A kg is longer than a mi

D. Gram

B. Centi-.

A. 1 gram

### When multiplying and /or dividing quantities, you should report

D. The result rounded to the number of digits as in the quantity with the least number of significant figures

D. 2.54mg

A. Kg/m3

C. A half liter

Example: