Forces in Motion Review

A baseball bat hits a baseball with a force of 100 Newtons. What is the force and its direction exerted by the ball on the bat?

• 100 Newtons, same direction

• 100 Newtons, opposite direction

• 200 Newtons, same direction

• 200 Newtons, opposite direction

Tags

NGSS.MS-PS2-1

The nozzle of a rocket is pointed downward so that as fuel is ignited, the exhaust pushes downward. Why is this arrangement necessary for a rocket to function properly?

• The rocket is protected from the heat of the exhaust.

• Burned fuel can be collected on the ground.

• As fuel is combusted, the rocket pushes the gases backward and the gases push the rocket forward.

• This allows the rocket to be steered properly.

Tags

NGSS.MS-PS2-1

The head of a hammer is often made of steel. This makes the head heavy, which helps create a strong force for driving nails. Steel is also strong. The head of a hammer must be strong to resist what force?

• The force of the air resistance on the moving hammer

• The force of the person using the hammer

• The force of gravity pulling down on the hammer

• The force of the nail pushing in the opposite direction

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The illustration shows all the forces in Newtons (N) acting on a box. The sum of all the forces acting on the box results in a force acting on the box–

• to the right with a strength of 11 Newtons.

• to the left with a strength of 7 Newtons.

• to the right with a strength of 25 Newtons.

• to the left with a strength of 6 Newtons.

Tags

NGSS.MS-PS2-2

Students are investigating how mass affects the force needed to move an object. They attached a wooden block to a spring scale and placed a 10 g mass on top of the block and pulled it 50 cm across the table. Which of the following changes to their setup would result in a larger force reading on the spring scale?

• Sliding the block 60 cm

• Attaching a larger spring scale

• Using a 20 g mass

• Using a circular piece of wood

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Students are using an air rocket to investigate the relationship between force and an object’s motion. Students pump air into the rocket, then release the rocket, and the compressed air pushes the rocket upward. In order to vary the amount of force acting on the rocket, which of the following should the students change in each trial?

• The length of the hose attached to the pump

• The distance traveled by the rocket

• The amount of air pumped into the rocket

• The height of the rocket from fins to cone

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which of the following graphs shows how the mass of an object affects the amount of force needed to move it?

• 
• 
• 
• 

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NGSS.MS-PS2-2

A ball rolls across the floor. Because of friction, the ball will eventually slow down and come to a stop. Which of the following is evidence of energy transfer resulting from the change in the motion of the ball?

• Different surfaces create different amounts of friction.

• The ball moves in the same direction as it rolls across the floor.

• Energy sets the ball in motion.

• The ball and the floor gain a small amount of heat energy.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

The total kinetic energy of two cars is measured before and after they crash into each other. The total kinetic energy of the two cars after the crash is less than the total kinetic energy before the crash. Which of the following best explains the loss of kinetic energy?

• Some of the cars' kinetic energy was converted to sound and heat energy.

• Both of the cars were being pulled downward by the force of gravity.

• The cars will eventually stop moving, which shows that energy is always lost.

• The car with more mass gave up its kinetic energy to the car with less mass.

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following statements are true?

• As force increases, acceleration decreases

• As force increases, mass decreases

• As force increases, acceleration increases

• There is no relationship between force and acceleration

Tags

NGSS.MS-PS2-2