Explain How Factors Such as Gravity, Friction, and Change in Mass Affect the Motion of Objects

A push and a pull are two examples of which the following?

• a force

• velocity

• a law of motion

• a balanced force

Tags

NGSS.MS-PS2-1

Which term names a force of attraction between two objects, even if they are not touching?

• inertia

• gravity

• friction

• unbalanced force

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

Which of the following gives the definition of inertia?

• a sudden shift in acceleration

• a continuous downward force

• the tendency of objects to resist a change in motion

• the ability of objects to move in a smooth, curving path

Which of the following terms identifies a cause of a change in motion?

• inertia

• mass and force

• balanced forces

• unbalanced forces

Tags

NGSS.MS-PS2-2

What term identifies a force that opposes motion and acts between two objects that are touching?

• inertia

• gravity

• friction

• balanced force

Four students used spring scales to measure the force needed to pull blocks made of different materials up a smooth ramp. All of the blocks moved at the same rate. The students recorded the force needed to move the different blocks: 6 N, 8 N, 7 N, and 5 N. Which of the following is a possible explanation for why the blocks required different amounts of force?

• The blocks all had different masses.

• The blacks all had the same mass but different sizes.

• The blocks had the same mass, but the force of gravity changed.

• Each student exerted the same force, but the friction was different.

Tags

NGSS.MS-PS2-2

Suri tapes batteries to three identical toy cars to give them different masses. Then, Suri measures how far each car rolls when she launches it from the same starting point using the same stretched rubber band. Car #1 has 1 Magnet

Car #2 has 2 magnets

Car #3 has 3 magnets

How will the force of the rubber band affect the cars?

• Car 3 will travel the longest distance

• Car 1 will travel the shortest distance

• Car 1 will be the least affected by the force acting upon it.

• Car 3 will be the least affected by the force acting upon it.

Tags

NGSS.MS-PS2-2

A spring scale measures force. What is the force that causes the reading on the spring scale?

• friction

• gravity

• mass

• weight

When you coast down a hill on a scooter, you move faster and faster. If you continue moving onto a level surface, finally you will stop moving. Which of Newton's laws of motion explains why you stop?

• Newton's first law explains that when you reach the bottom of the hill, you run out of energy, so you stop moving.

• Newton's first law explains that gravity affects you when you move downhill, but not when you move on a level surface.

• Newton's second law explains that no force acts on your scooter on the level surface, so it stops moving.

• Newton's third law explains that friction between the tires and the ground is an unbalanced force that changes your motion.

Tags

NGSS.MS-PS3-5

Two race cars with the same mass started moving on a race track at the same time. One car reached the finish line of the track in 15 sec, and the other reached the finish line in 20 sec. Why did the cars take different amounts of time to reach the finish line?

• The force of gravity slowed one car but not the other car.

• The slower car did not experience any force, so it moved more slowly.

• The forces on one car were balanced and on the other car unbalanced.

• The engine of the faster car exerted more force than the engine of the other car.

Tags

NGSS.MS-PS2-2