Exit Ticket: Gravity and Friction

A ball is kicked and rolls along a level field until it comes to a stop. What is most responsible for the ball coming to a stop?

• air
• gravity
• mass
• friction

A skydiver jumps from an airplane with a parachute. Which best explains how forces affect the skydiver’s fall?

• Gravity pulls her down and friction slows her fall.
• Friction pulls her down and gravity slows her fall.
• Friction pulls her down and gravity makes her lighter, so she falls slower.
• Gravity pulls her down and friction makes her heavier, so she falls faster.

Sandy wants to add a material to her skateboard to gain more friction to keep her feet from slipping off of the board. Which of these materials could she add to her skateboard to provide the most friction?

• plastic
• sandpaper
• metal
• cloth

Destin needs to push a heavy box. Which of these could Destin use to help make moving the box easiest?

• a rope
• a ramp
• a cart with wheels
• a hammer

Automobile engineers design cars in a way that reduces the amount of friction. What is the type of friction surface encounter while moving through the air?

• air pressure
• air speed
• air resistance
• air quality

When you are riding your bike up a hill, what is the effect of gravity?

• You will speed up because the force of gravity is pulling in the same direction you are pushing.

• You will speed up because the force of gravity is pulling in the opposite direction you are pushing.

• You will slow down because the force of gravity is pulling in the same direction you are pushing.

• You will slow down because the force of gravity is pulling in the opposite direction you are pushing.

When you throw a ball into the air, it will begin to slow down, reverse direction, and then start speeding up.  Why does this happen?

• The ball continue to travel up until the air pressure pushed it back to the ground. There is more air pressure near the ground, so it sped up.

• The ball became heavier as it traveled into the sky because of gravity so it began falling back to the ground.

• Once the ball leaves your hand, you are no longer applying the force stronger than needed to keep the ball moving upward.

• The center of the Earth is made of iron which is magnetic and pulls all things back towards the Earth.

A spring is attached to a table. Students investigate the motion of a marble when it is launched by the spring.  When the students push back the spring, what is the MOST likely path of the marble?

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