# warm up: 9/24

## Quiz by Julie Edwards

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3 questions
• Q1
Alex places 2 cubes side-by-side on a ramp made of wood. Cube #1 is ice and Cube #2 is wood wrapped with sandpaper. The cubes are the same size and the same mass and are placed at the same height on the ramp. When Alex released the two cubes, the ice cube slid down the ramp, but the sandpaper cube did not move. What accounts for this difference?
The sandpaper block did not move because the forces of friction and gravity were unbalanced.
The sandpaper block did not move because the forces of friction and gravity were balanced.
The ice cube moved because the forces of friction and gravity were balanced.
30s
• Q2
John is an outstanding forward on his club select soccer team. He is known for his ball control and speed. After a game, he often makes a sketch of moves that were successful. The dotted line on his sketch shows the magnitude and the direction the ball was moving when he kicked it. The magnitude and direction of his kick is the solid arrow.
The ball continued moving in the same direction and its speed increased.
The ball continued moving in the same direction and its speed decreased.
The ball changed directions and its speed increased.
The ball came to a complete stop.
30s
• Q3
In order for an object such as a communications satellite to maintain a constant orbit around the Earth, what must be true? The forward motion of the satellite must
be greater than the Earth’s rotational speed.
be in balance with Earth’s gravitational pull
vary slightly due to the tilt of the Earth’s axis.
30s

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