Dynamics

Which of the following must be true if an object is accelerating?

• It is going really fast.

• It is moving away from the frame of reference point.

• Balanced forces are acting upon it.

• Unbalanced forces are acting upon it.

Tags

NGSS.MS-PS2-2

A student drops a ball onto the floor and it bounces. Which of the following statements about the interaction between the ball and the floor is correct?

• The floor applies the same amount of force to the ball that the ball applies to the floor, which causes the ball to bounce.

• The floor applies a larger amount of force to the ball than the ball applies to the floor, which causes the ball to bounce.

• The floor applies a larger amount of force to the ball than the ball applies to the floor because it is a part of the Earth.

• The ball applies a larger amount of force to the floor than the floor applies to the ball because the ball bounces.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Sami wants to build the fastest racing bike possible. What is one way he can change the bike, so she has a better chance of winning the race?

• reduce the mass of the bike so it accelerates more quickly

• put on smoother tires to eliminate friction with the race track

• increase the mass of the bike to increase its gravitational field

• replace metal parts with plastic to decreases its magnetic field

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS2-2

The force diagram for an object that is being dragged across the floor is shown to the right. The object is experiencing an acceleration of 2 m/s² as it moves under the influence of the forces shown. Use the diagram to determine the force of friction acting on the object.

• The force of friction is 30 newtons.

• The force of friction is 50 newtons.

• The force of friction is 20 newtons.

• The force of friction is 150 newtons.

Tags

NGSS.MS-PS2-2

What is the net force for an object with a constant velocity of 10 m/s?

• Zero

• Less than 10 N but greater than 0

• Greater than 10 N

• 10 N

• Less than 0 N

After breaking up, Jane slapped John with a force of 15 N. But John did not slap back because he knows that he exerted the same amount of force on Jane. What concept supported the idea of John?

• Law of Inertia

• Law of Acceleration

• Law of Action-Reaction

• Law of Gravitation

• Conservation of Energy

Tags

NGSS.MS-PS2-1

A body at rest remains at rest, or, if in motion, remains in motion at a constant velocity unless acted on by a net external force. This statement is known as

• Law of Inertia

• Law of Acceleration

• Law of Interaction

• Law of Gravitation

• Conservation of Energy

Tags

NGSS.HS-PS2-1

1 Newton of force is equal to

• 1 kg m/s

• 1 kg m/s²

• 1 kg /ms²

• 1 m/ kg s²

• 1 s/ kg m

The weight of an object can change when the object enters into a region with stronger or weaker gravity.

• True

• False

Tags

NGSS.MS-PS2-4

The mass of an object can change when the object enters into a region with stronger or weaker gravity.

• True

• False