8th Grade 2nd Semester Exam Review

How does a baseball thrown in space act differently than a baseball thrown on Earth?

• On Earth, the ball will keep flying forever until someone catches it

• In space, the ball will drift for a while and then slowly come to a stop in the air

• In space, the ball will fly forever because there is no wind or gravity to apply unbalanced forces

• On Earth, the ball will fall almost immediately because gravity causes a lot of friction on the ball

What is the speed of a bus that travels 90 km in 2.25 hours?

• 36 km/h

• 40 km/h

• 225 km/h

• 60 km/h

Lindsay runs 5 meters per second on the track. How far can she run in one minute?

• 30 meters

• 120 meters

• 60 meters

• 300 meters

If an airplane travels at a speed of 610 km/h for 2.75 hours, how far will it go?

• 2557 km

• 221.82 km

• 450.8 km

• 1667.5 km

Mike did 20 J of work to push a 2 N hockey puck across a frozen pond. How many meters did the hockey puck travel?

• 40 meters

• 10 meters

• 20 meters

• 30 meters

Which of the following is Newton's first law?

• An object in motion will remain in motion and an object at rest will remain at rest until acted upon by an unbalanced force

• Acceleration depends on force and mass

• Energy cannot be created or destroyed, but it can change in form

• For every action that occurs, there is an equal but opposite reaction

Which of the following is Newton's 2nd law of motion?

• An object at rest remains at rest and an object in motion remains in motion until acted upon by an unbalanced force

• The amount of acceleration depends on both force and mass

• Energy cannot be created or destroyed, but it can change in form

• For every action there is an equal and opposite reaction

Which of the following is Newton's 3rd law of motion?

• An object at rest remains at rest and an object in motion remains in motion until acted upon by an unbalanced force

• The amount of acceleration depends on both force and mass

• Energy cannot be created or destroyed, but it can change in form

• For every action there is an equal and opposite reaction

How does acceleration differ from speed?

• Speed is the change in acceleration

• Acceleration is the result of unbalanced forces

• Acceleration is constant

• Speed is written as m/s²

The boy is trying to pull the dog's leash back towards him, but the boy and the dog keep moving to the right. Which of the following choices explains why?

• The forces are balanced because the dog is stronger

• The forces are unbalanced because the boy's force is stronger

• The forces are unbalanced because the dog's force is stronger

• The forces are balanced because the net force is zero