C. forward D. upward 8. How distance between two objects affects the pull of gravity? A. The lesser the distance, the lesser the gravitational pull between them. B. The greater the distance, the lesser the gravitational pull between them. C. The greater the distance, the greater the gravitational pull between them. D. None of these, the gravitational pull between them depends on their weights. 9. A baseball and a sheet of paper are dropped at the same time from the same height. What will occur if there is no air resistance? A. The baseball will land first. B. The paper will float slowly through the air. C. The baseball will float slowly through the air. D. The baseball and the paper will land at the same time. 10. Why did a ball thrown to the air fall back to the ground? A. Gravity caused the ball to fall. Air oougod the ball to fall on the ground

The coefficient of kinetic friction is equal to the force of kinetic friction divided by   a. the normal force b. the weight of the object c. the mass of the object d. the acceleration of the object     Why is static friction more complex in analysis than kinetic friction? a .Because its magnitude and direction can vary b. Because it is invisible c. Because it does not depend on the normal force d. Because it depends on the kinetic friction

3. Two astronauts in space, each will a mass of 100 kg, are 2 meters apart from one another. a) What is the gravitational force between them? b) Both astronauts are initially at rest, but the force of gravity between them will cause them to accelerate toward one another. At what rate will they accelerate toward one another? (a = F/m.) ans. a) 1.67 x 10-7 N %3D

Astronauts in orbit feel weightlessness because, choose all that apply.   A. astronauts in orbit are without support force.   B. Because of absence of gravity in orbit.   C. astronauts in orbit are in a state of continuous free fall.   D. Orbits are designed like that so that there is no force.

1.

You go through a loop in a roller coaster at constant speed. Your acceleration is: A. zero B. straight down C. toward the center D. straight up

9. True or False questions. Circle the correct answer. a. An example of a Vector is Temperature. TRUE or FALSE b. In a vacuum, Heavier objects fall faster than lighter objects. TRUE or FALSE C. X values and Y values can be determined independently when performing calculations using Galileo's kinetic equations. TRUE or FALSE d. Static friction is a force that applied to object that is stationary. TRUE or FALSE e. When a spring is compressed, the spring is said to have potential energy. TRUE or FALSE f. A car crash is an example of an Impulse. TRUE or FALSE g. Centripetal force is not a new force. It is any combination of forces that cause an object to follow a path of circular motion. TRUE or FALSE h. Consider the following shapes: Cylinder, Hoop, Solid sphere, and spherical shell. The cylind has the greatest inertia. TRUE or FALSE

3. The mass of a particle is 18 kg. a. What is its weight on Earth? b. What is its weight on the Moon? c. What is its mass on the Moon? d. What is its weight in outer space far from any celestial body? e. What is its mass at this point?

What is the gravitational force that two 70 kg people exert on each other when standing 15 m apart? O A. 1.67x10-9 N O B. 2.22x10-11 N O C. 6.67x10-11 N O D. 2.50x10-8 N

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