Unit 1 Lesson 3 Forces Quiz

A box of books is on the floor. The following picture shows a push and a pull acting on the box.

What is the net force toward the right on

the box?

• 0 N

• 50 N

• 100 N

• 2,500 N

Which of the following is considered a contact force?

• the force between two magnets

• the gravitational pull of a planet

• friction between an object and air

• the force between two charged particles

Two equal forces act in opposite directions on object A. Two unequal forces act in opposite directions on object B. If these are the only forces acting on objects A and B, which of the following conclusions is true?

• Only object A will accelerate.

• Only object B will accelerate.

• Both object A and object B will accelerate.

• Neither object A nor object B will accelerate.

Jessica has two balls. One ball has a mass of 1 kg. The other ball has a mass of 2 kg. She pushes each with a force of 100 N. How does the acceleration of the two balls compare?

• The 1-kg ball accelerates the same as the

  2-kg ball.

• The 1-kg ball accelerates half as much as the 2-kg ball.

• The 1-kg ball accelerates twice as much as the 2-kg ball.

• The 1-kg ball accelerates four times as much as the 2-kg ball.

During a baseball game, a hitter strikes the ball with a bat. When this happens, the ball and

the bat exert a force on each other. Why does the ball accelerate away from the bat more than

the bat accelerates away from the ball?

• The ball has less mass, so it exerts less force on the bat.

• The ball has greater velocity before the collision, so the force affects the ball more than it affects the bat.

• The bat exerts more force than the ball because the batter is exerting a force on the bat as it hits the ball.

• The ball has less mass, so the equal force on the ball and the bat causes greater acceleration of the ball.