OpenSciEd Force

A golfer hits a golf ball with a club. The mass of the ball is 0.05 kg. The ball accelerates at 2,000 m/s². What is the net force, to the nearest newton, that accelerates the ball?

• 2.5 N

• 10 N

• 40N

• 100 N

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A student used a video camera to record another student dropping a marble through water in a graduated cylinder. The students watched the video in slow motion and made the observations shown below. During which part or parts of the marble's fall did the marble experience unbalanced forces?

• Part 1 only

• Parts 1 and 2 only

• Part 3 only

• Parts 2 and 3 only

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The diagram below shows a sled moving along a smooth, frictionless track. In which sections of the track will the sled experience an unbalanced force?

• Sections 1 and 3

• Sections 2 and 3

• Sections 2 and 4

• Sections 3 and 4

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The diagram shows a homemade car being pushed with a force of 25 N. The force causes the car to move at a constant speed of 3 m/s. What will happen if the force is changed to 35 N?

• The car will move at a constant speed of 13 m/s.

• The speed of the car will not change.

• The speed of the car will increase.

• The speed of the car will decrease to 1 m/s.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

For an investigation, a student measures the speed of a cart as it rolls down a ramp. The student then records the data in the table below. Which of these best explains the student's data?

• The speed of the cart decreases as the cart rolls down the ramp because of friction between the cart and the ramp.

• The speed of the cart increases as the cart rolls down the ramp because the force acting on the cart is greater than the force of gravity.

• The speed of the cart increases as the cart rolls down the ramp because the forces acting on the cart are unbalanced.

• The speed of the cart decreases as the cart rolls down the ramp because the forces acting on the cart are balanced.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Some students measure the acceleration of a wheeled cart being acted on by varying forces. The students record their data in the table shown above. According to the data table, how much force is acting on the cart when the students measure an acceleration of 2.6 m/s²?

• 13 N

• 7 N

• 8 N

• 12 N

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A toy train engine rests motionless on a track. Once student begins pushing the engine to the right with a force of 2 newtons. At the same time, another student begins pushing the engine to the left with a force of 5 newtons. Which of the following best describes the resulting motion of the engine?

• It travels left at a constant speed.

• It travels left at an increasing speed.

• It travels right at a constant speed.

• It travels right at an increasing speed.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The list includes six situations. Which objects in the list experience an unbalanced force?

• The book, the ball, and the car

• The ball, the car, and the bird

• The can, the swing, and the bird

• The book, the ball, the can, and the swing

Tags

NGSS.MS-PS2-2

NASA's space shuttle program was active from 1981 until 2011. The photograph shows rockets carrying a space shuttle off the launchpad. How can Newton's law of action-reaction best be applied to explain the movement of a rocket?

• As fuel burns, gasses push against the rocket, moving it upward.

• As fuel burns, gasses move out of the rocket and reduce air resistance.

• As the fuel burns, the mass of the rocket decreases.

• As the fuel burns, the rocket moves faster.

Tags

NGSS.MS-PS2-1

During a demonstration of Newton's laws of motion, a student used the setup shown in Figure 1. The student flicked the index card with a fingertip, and the coin fell straight down into a plastic cup as shown in Figure 2. Which of these best explains why the coin fell straight down into the cup instead of remaining in the index card?

• The coin was at rest until the card was removed, so it tended to remain in the same location. Once the card was gone, the unbalanced force of gravity caused the coin to fall.

• Moving the card applied an action force on the coin. Since the card was gone, gravity applied a reaction force on the coin.

• The card has less mass than the coin, so a smaller force of gravity acted on the card. The larger force of gravity on the coin made it fall.

• The acceleration of the coin falling into the cup was equal and opposite to the acceleration of the card.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2