Forces and Interactions

Benjamin has two rubber balls. One ball has a mass of 100 grams and the other has a mass of 500 grams. He places both balls on a line. Then he pushes both balls in the same direction with the same amount of force. What will most likely happen?

• The 500 gram ball will move more easily.

• The 100 gram ball will move more easily.

• The two balls will travel at the same speed.

• The two balls will travel in opposite directions.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Nigel discovered he could stick a balloon to a wall after rubbing it on a wool sweater. What is the most likely reason this is happening?

• gravity

• static electricity

• magnetic force

• unbalanced forces

Tags

NGSS.MS-PS2-5

A recycling center wants to use electromagnets to sort trash. An engineer is designing a solution to this problem of sorting trash. Which example below is the best solution to solving this problem?

• The solution must be able to separate metal from paper.

• The solution must not be too expensive.

• The solution must be built within a month.

• The solution is not able to separate metal from paper.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

NGSS.MS-ETS1-4

Tony’s father is pushing him on a swing. The swing moves back and forth in a regular pattern. What is likely to happen if his father pushes the swing harder?

• The swing will slow down.

• The swing will move to the left.

• The swing will go higher.

• The swing will stop.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

Which of these objects are exerting contact forces on each other? Choose 2 examples.

• a bat hitting a baseball

• Earth in orbit around the sun

• a bicycle leaning against a wall

• a leaf falling to the ground

Tags

NGSS.MS-PS2-1

A bike is parked on the sidewalk. The kickstand keeps the bike from falling over. What can you tell about the kickstand?

• The sidewalk and the kickstand are not in contact.

• The sidewalk and the kickstand are exerting forces on each other

• The bike is not leaning on the kickstand.

• The kickstand and the bike are unbalanced forces.

Tags

NGSS.MS-PS2-2

In which of the following are balanced forces acting on an object? Choose 2 examples.

• An apple falling from a tree to the ground

• a book resting on a desk

• a soccer player kicking the ball toward the goal

• two teams in a tug-of-war that are not moving the rope.

What can change when the forces acting on an object are unbalanced? Choose 2 examples.

• the object's speed

• the object's strength

• the object's direction of motion

• the object's weight

Tags

NGSS.MS-PS2-2

Lisa places two magnets 4 cm apart. The magnets repel each other. Next she moves the magnets 8 cm apart. Then the magnets do not move. What question is Lisa trying to answer?

• Does the force between two magnets change with distance?

• Does gravity increase when magnets are further apart?

• Does the size of a magnet affect its strength?

• Does the shape of a magnet affect its strength?

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Lisa places two magnets 4 cm apart. The magnets repel each other. Next she moves the magnets 8 cm apart. Then the magnets do not move. What happens as the magnets move farther apart?

• The magnetic poles reverse.

• The magnets are no longer magnetic.

• The force of magnetism decreases.

• The magnetic force changes to attraction.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5