SCI8 – Unit 1 Forces & Motion Review Test

Two toy cars, Car X and Car Y, are pushed with the same force. Which car will accelerate faster when?

• Car X because it has less mass

• Car Y because it has more mass

• Car Y because it has greater inertia

• Car X because it has more volume

A soccer ball with a mass of 0.5 kg is kicked with a net force of 3 N. Which equation can be used to find the acceleration of the soccer ball?

• a = F × m

• a = m ÷ F

• a = F ÷ m

• a = m + F

Two students on roller skates push off each other. One student is larger than the other. What happens immediately after they push away?

• Both students accelerate equally.

• The larger student accelerates more.

• The smaller student accelerates more.

• Neither student accelerates.

Car A travels the same distance each second. Cart B travels a greater distance each second. Which statement explains the difference?

• Cart A is accelerating because forces are balanced.

• Cart B is moving at a constant speed.

• Cart A is at constant speed because forces are balanced; Cart B is accelerating because forces are unbalanced.

• Cart A is at rest; Cart B is accelerating.

A student pushes an empty wagon and then pushes the same wagon loaded with books using the same force. Select TWO correct answers.

• The empty wagon accelerates faster.

• The loaded wagon accelerates faster.

• The loaded wagon ends with a greater final speed.

• The empty wagon ends with a greater final speed.

An airplane flying at a constant speed experiences thrust and drag. Fill in the blanks: At constant speed, thrust is ________ drag. This demonstrates Newton’s ________ Law. When thrust increases, the airplane ________, showing Newton’s ________ Law.

• At constant speed, thrust is equal to drag. This demonstrates Newton’s First Law. When thrust increases, the airplane accelerates, showing Newton’s Second Law.

• At constant speed, thrust is greater than drag. This demonstrates Newton’s Second Law. When thrust increases, the airplane decelerates, showing Newton’s First Law.

• At constant speed, thrust is less than drag. This demonstrates Newton’s Third Law. When thrust increases, the airplane stops, showing Newton’s First Law.

• At constant speed, thrust is equal to drag. This demonstrates Newton’s Third Law. When thrust increases, the airplane slows down, showing Newton’s Second Law.

8. A student quickly pulls a sheet of paper from under a book. The book stays in place. Which statement explain why?

• The book has inertia and resists changes to its motion; friction between the book and paper is not enough to move the book quickly.

• The book is glued to the table and cannot move; the paper is very slippery.

• The book is lighter than the paper; gravity pulls the paper faster than the book.

• The book is magnetic and sticks to the table; the paper is not affected.

A car speeds up when entering a freeway. - According to Newton’s ________ Law, the car’s tires and the road push on each other with equal and opposite forces. - According to Newton’s ________ Law, the acceleration of the car depends on the net force applied and the car’s mass.

• Third Law, Second law

• Second law, first law

• First law, Third Law

• Second law, Third law

10. Two cars with different masses apply their brakes at the same time while traveling at the same speed. What happens to their stopping distances and which of Newton’s Laws explains this?

• The car with greater mass has a longer stopping distance, explained by Newton’s Second Law.

• Both cars stop at the same distance, explained by Newton’s First Law.

• The car with less mass has a longer stopping distance, explained by Newton’s Third Law.

• Both cars stop at the same distance, explained by Newton’s Third Law.

Four students build balloon cars. Which car would have the least acceleration?

• A. A light car with a weak balloon

• B. A heavy car with a strong balloon

• C. A light car with a strong balloon

• D. A heavy car with a weak balloon