Final review 3

The graph below represents the motion of a cart. How does the speed of the cart compare when t = 6 s and t = 12 s?

• The speed of the cart at 6 s is greater than when time equals 12 s.

• The speed of the cart at 6 s is less than when time equals 12 s.

• The speed of the cart is 0.5 m/s at 6 s and 12 s.

• The speed of the cart is 2 m/s at 6 s and 12 s

The chart below represents the change in velocity for four different trains. If it took 5.38 s to reach the final velocity, which train had the greatest

acceleration?

• W

• X

• Y

• Z

Why does a flat piece of notebook paper take longer to reach the ground than an

identical piece of notebook paper crumpled into a ball?

• The flat piece of paper has more mass.

• The crumpled piece of paper has more mass.

• The frictional force of air has more effect on the falling flat piece of paper

• The frictional force of air has more effect on the falling crumpled piece of

  paper.

Why does the weight of an object change with increasing elevation on Earth?

• The mass of the object decreases with higher elevation.

• The force of gravity acting on the object increases with higher elevation

• The force of gravity acting on the object decreases with higher elevation.

• The mass of the object increases with higher elevation.

Which type of friction occurs when an eraser is rubbed across a sheet of paper?

• rolling

• sliding

• static

• fluid

Two students pull on the opposite ends of a rope, but neither student is able to

move the other. Which statement best explains why neither student is moved?

• They each pull on the rope with the same amount of force, so the net force is zero

• They each exert the same amount of friction against the ground, so the net friction is zero

• Their forces are not balanced, but gravity keeps them from moving.

• The two students have the same mass.

The diagram below shows a board on top of two bricks with a cylinder on top of the board. The board exerts an upward force of 50 N. Which best explains this situation?

• The board has a weight of 50 N.

• The cylinder has a weight of 50 N.

• The combined weight of the two bricks is 50 N.

• The combined weight of the bricks, board, and cylinder is 50 N.

Which is an example of a mixture

• iron filings

• copper wire

• bronze pipe

• titanium metal sheet

The chart below shows the density of five gases. A gas has a volume of 4.52 L. If its mass is 8.05 g, what is the identity of the gas?

• ;helium

• neon

• argon

• krypton

This graph shows the solubility curves for various ionic compounds .At which temperature does KCl have the same solubility as CuSO4?

• 18°C

• 38°C

• 73°C

• 100°C