Assignment:
1) Aristotle would have considered a falling rock to be what kind of motion?
2) Which has the greater inertia, a 1 kg sample of lead or a 1 kg sample of aluminum?
A) Lead
B) Aluminum
C) They are the same
3) A kilogram is a measure of an object's
A) weight.
B) force.
C) mass.
D) gravity.
E) center of mass.
4) Your weight is
A) your mass.
B) the gravitational attraction between you and the Earth.
C) a property of mechanical equilibrium.
D) the same in all locations.
5) A 1-kg mass at the Earth's surface weighs about
A) 1 N.
B) 5 N.
C) 10 N.
D) 12 N.
E) none of these
6) An object weighs 30 N on Earth. A second object weighs 30 N on the Moon. Which has the greater mass?
A) the one on Earth
B) the one on the Moon
C) They have the same mass.
D) not enough information to say
7) An object is pulled northward with a force of 20 N and southward with a force of 15 N. The magnitude and direction of the net force on the object is
8) Hang from a pair of gym rings and the upward support forces of the rings will always (circle one)
A) each be half your weight.
B) each be equal to your weight.
C) add up to equal your weight.
9) If you push a box across the floor at a constant velocity, the friction force must be
A) More than your push
B) Less than your push
C) equal to your push
10) A 250-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is how many Newtons?
11) A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is
A) the same as the force on the 1-kg book.
B) 10 times as much as the force on the 1-kg book.
C) zero.
12) A car accelerates from rest at 2 m/s/s. What is its speed 4 s after the car starts moving?
13) It takes 6 s for a stone to fall to the bottom of a mine shaft. How deep is the shaft (assume no air resistance)
14) A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration in meters per second per second?
15) An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the
A) weight of the arrow.
B) air resistance against the bow.
C) friction of the ground against the archer's feet.
D) grip of the archer's hand on the bow.
E) arrow's push against the bowstring.
16) A baseball player bats a ball with a force of 1000 N. The ball exerts a reaction force against the bat of
A) less than 1000 N.
B) more than 1000 N.
C) 1000 N.