Force Test Review

Billy swings at the baseball with greater force than his last swing. What are some reactions you can expect from the ball?

• • The ball will go slower and in the opposite direction it was thrown.

• • The ball will go faster and in the same direction it was thrown.

• • The ball will go faster and in the opposite direction it was thrown.

• • The ball will go slower and in the same direction it was thrown.

Answer explanation

When Billy swings with greater force, he imparts more energy to the ball, causing it to accelerate. The ball will move faster and in the opposite direction of the way it was thrown, as per Newton's third law of motion.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Who will win or not win? EXPLAIN.

• Equal/Balanced forces, no motion, no one wins/tie

• Unequal/Unbalanced forces, motion to left, green shirt wins

• Unequal/Unbalanced forces, motion to right, red shirt wins

Answer explanation

The correct choice is 'Equal/Balanced forces, no motion, no one wins/tie' because when forces are balanced, there is no net movement, resulting in a tie. This indicates that neither side has the advantage.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A ball is resting on the ground. Are the forces balanced or unbalanced, and is there motion or no motion?

• Forces are balanced, and there is no motion.

• Forces are unbalanced, and there is motion.

• Forces are balanced, and there is motion.

• Forces are unbalanced, and there is no motion.

Answer explanation

The ball is at rest, meaning the forces acting on it, such as gravity and the normal force from the ground, are equal and opposite, resulting in balanced forces. Therefore, there is no motion.

Tags

NGSS.MS-PS2-2

Which way will the box move and why?

• • The box will move to the left due to the unequal forces.

• • The box will move to the right due to the unequal forces.

• It will not move because the forces are balanced.

• It will move upwards due to an upward force.

Answer explanation

The box will move to the right because the forces acting on it are unequal, resulting in a net force that pushes it in that direction.

Tags

NGSS.3-PS2-1

Where could you expect a car to move the most because of unbalanced forces?

• The top of a steep hill

• On a flat road

• In a parking lot

• On a bumpy road

Answer explanation

A car at the top of a steep hill experiences unbalanced forces due to gravity pulling it downwards. This results in the greatest potential for movement compared to flat or bumpy surfaces where forces are more balanced.

Tags

NGSS.MS-PS2-2

For the balloon rocket experiment, which science tools would be required to measure distance and time?

• Meter Stick/Ruler and stopwatch

• Thermometer and barometer

• Microscope and telescope

• Balance and graduated cylinder

Answer explanation

The correct tools to measure distance and time in the balloon rocket experiment are a meter stick or ruler for distance and a stopwatch for time. The other options do not serve this purpose.

Why is it important to only have a single independent variable in your experiment?

• To ensure that the results are due to the independent variable alone

• To make the experiment more complex

• To increase the number of variables affecting the outcome

• To confuse the results

Answer explanation

Having a single independent variable ensures that any changes in the dependent variable can be attributed directly to it, eliminating confusion and allowing for clear conclusions about cause and effect.

How might a different surface increase the amount of force you would measure on a spring scale?

• By increasing friction

• By decreasing friction

• By changing the angle of the surface

• By altering the material of the spring

Answer explanation

Increasing friction on a surface can lead to a greater force being measured on a spring scale. This is because more friction means more resistance to movement, which can affect the force exerted on the scale.

What are constant variables in an experiment?

• Variables that change during the experiment

• Variables that remain the same throughout the experiment

• Variables that are measured in the experiment

• Variables that are not important in the experiment

Answer explanation

Constant variables in an experiment are those that remain the same throughout the experiment. This ensures that any changes in the outcome can be attributed to the independent variable, making the results more reliable.

This experiment can be best used to determine...

• how the force used to pull a dictionary affects the mass of a box of marbles

• how mass affects the force needed to move objects

• how the mass of a box of marbles affects the mass of a dictionary

• how mass affects the force needed to move objects

Answer explanation

The correct choice, 'how mass affects the force needed to move objects', directly relates to the experiment's focus on the relationship between mass and force, aligning with Newton's second law of motion.

Tags

NGSS.MS-PS2-2