Gravity & Bridges Quiz

Gravity & Bridges Quiz

DO NOT write on this test. Write your answers only in your notebook.

1- How are mass and weight different?

a. mass depends on how much matter is in the object but weight doesn’t

b. weight depends on how much matter is in the object but mass doesn’t

c. weight depends on gravity but mass doesn’t

d. mass depends on gravity but weight doesn’t

2- Which of these best describes the relationship between the mass of an object and Earth’s gravitational pull on the object?

a. the smaller the mass of the object, the greater is Earth’s gravitational pull on it

b. the smaller Earth’s gravitational pull, the greater the mass of the object

c. the greater the mass of the object, the greater is Earth’s gravitational pull on it

d. the greater Earth’s gravitational pull, the greater the mass of the object

Three guys, John, Mario, and Brock decided to see how many arm curls they could do without stopping. An arm curl is performed by holding a barbell with the arm straight down and the hand facing forward, then bending the arm at the elbow and raising the barbell toward the shoulder. They used 3 different barbells of increasing mass. These curls were all done between 9:00 and 9:30 a.m. on the same day.

3- What would be a good conclusion for this activity?

a. Mario is the strongest boyb. Brock is the strongest boy

c. as the mass was increased, the number of curls decreased

d. as the number of curls decreased, the mass increased

4- The independent variable is the variable you change, or allow to change. What was the independent variable in this experiment?

a. barbells of different massb. time of day

c. number of liftsd. which boy was lifting

5- The dependent or responding variable is the one that changes as a result of the independent variable.

What was the dependent variable in this experiment?

a. barbells of different massb. time of day

c. number of liftsd. which boy was lifting

6- Which of these variables was a controlled variable?

a. barbells of different massb. time of day

c. number of liftsd. guys of different weights

7- In which of the situations would a given weight remain the same?

a. on Earth and on the moon

b. on Earth and in a space station orbiting above the Earth

c. inUtah and in Wyoming at the same altitude

d. on Earth and Mars

8- Which of these affects the gravitational pull between two objects?

a. how many layers each one hasb. how fast one of them is moving

c. how far apart they ared. whether they have a smooth or rough surface

9- Which of these types of bridges is best suited for spanning wide rivers?

a. concrete arch bridgeb. cantilever bridge

c. suspension bridged. continuous truss bridge

Match the following words to their definitions:

10- _____ forcea. a force that pulls objects toward each other

11- _____ newtonb. the gravitational force exerted on an object

12- _____ weightc. the amount of space that an object takes up

13- _____ massd. used to measure the strength of a force

14- _____ gravitye. a push or a pull

15- _____ densityf. mass of an object per unit of volume

g. the amount of matter in an object

16- If mass of a planet increases, the force of gravity:

a. increasesb. decreasesc. stays the samed. varies

17- Which of the following is determined by the force of gravity?

a. inertiab. weightc. momentumd. mass

18- Bridges resist the force of:

a. weightb. momentumc. gravityd. Newton

19- Which of the following objects has the greatest amount of gravitational force acting on Earth?

a. A kick ballb. A bowling ballc. An 8th grade studentd. A car

20- Isaac Newton discovered that large masses have more gravity than small masses. What evidence supports this discovery?

a. Earth allows smaller objects to escape its gravity.

b. the larger sun holds the smaller planets in orbit.

c. objects in space are sometimes weightless.

d. nothing can escape Earth’s gravity or atmosphere.