Force, Friction, Gravity, and Mass

After throwing a basketball through the net, Anna observed the ball as it hit the ground. Which is most likely responsible for the ball hitting the ground?

• friction

• gravity

• mass

• speed

A student is investigating the effect of force on several objects. If each ball is rolled with the same amount of force on the same surface, which ball will roll the farthest?

• golf

• tennis

• soccer

• basketball

The chart below shows four identical wagons loaded with different amounts of bricks. If the same amount of effort is applied to all four identical wagons, why would Wagon W move farthest?

• It has the least amount of mass, affecting its motion.

• It has the least amount of speed, affecting its motion.

• It has the greatest amount of gravity, affecting its motion.

• It has the greatest amount of friction, affecting its motion.

Ana is pushing a wheelbarrow of rocks. She stops and unloads half of the rocks. How will this effect the force needed to move the wheelbarrow?

• Gravity is increased, making the wheelbarrow easier to move.

• Gravity is decreased, making the wheelbarrow harder to move.

• Friction is increased, making the wheelbarrow harder to move.

• Mass is decreased, making the wheelbarrow easier to move.

Four cubes made of different materials are moving down a plastic slide.

Which cube would experience the greatest amount of friction?

• the cube made of ice

• the cube made of sandpaper

• the cube made of smooth plastic

• the cube made of polished stone

Chris attaches a sheet of sandpaper to the top of his skateboard. How

does this sandpaper most likely affect Chris’s skateboarding?

• It protects the skateboard from any damage.

• It allows Chris to steer the skateboard in a variety of directions.

• It reduces the effect gravity has on the skateboard as he moves down

  the ramp.

• It increases friction between the skateboard and Chris’s foot to keep

  him from slipping.

Brandon made a parachute for his action figure by taping a thin plastic sheet to pieces of string. Brandon tied the strings to the action figure. When he threw the action figure in the air, it fell back to the ground quickly. What can Brandon do to make the action figure fall to the ground more SLOWLY?

• use shorter pieces of string

• use a larger sheet of plastic

• add weights to the action figure

• throw the action figure higher into the air

A rocket is traveling toward space. What force must the rocket act against as it moves away

from Earth?

• mass

• gravity

• magnetism

• momentum

Two people need to move a large, heavy box. One person pushes the box, while the other

person pulls the box. Which way of moving the box makes the work easiest for the people?

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Tina washes her hands with a bar of soap. When she gets the soap wet, it becomes very slippery. What force decreases as the soap becomes wet?

• mass

• elasticity

• friction

• force