8th Gr Unit 3 (3-5)

Which of the following represents any kind of force being applied? Select all that apply.

• Stretching a rubber band and then letting it go.

• Dropping a ball.

• Playing with a yo-yo.

• A book sitting on a desk.

Tags

MS-PS2-2

What forces are acting on the ball? Select all that apply.

• the downward pull of Earth due to gravity

• the upward push of the table [a contact force]

• The contact force between the table and Earth

• a sidewise force due to the hand

Which of these forces act horizontally and which ones act vertically? Select 2 that apply.

• The contact force with the table and ball act horizontally.

• The contact force with the table and ball and the gravitational force act vertically.

• The applied force from the hand acts horizontally.

• The applied force from the hand acts vertically.

Why did the tennis ball begin to move?

• The tennis ball moved when the friction force was reduced.

• The tennis ball moved because the gravitational force was reduced when the ball was hit.

• The tennis ball moved because of balanced forces.

• The tennis ball began to move because a horizontal force acting on it.

Which statement generalizes why all objects start to move?

• Objects start to move when they have been pushed.

• Objects start to move when all of the forces are balanced.

• The beginning of motion is always caused by a force.

• The beginning of motion is caused when a push overpowers a pull.

What happens if the force applied to the ball in Hand 1 is greater than the force applied to the ball by Hand 2?

• The ball will start to move to the left because Hand 1 is on the left and it is stronger than Hand 2.

• The ball will start moving to the right because the force applied by Hand 1 overcomes the force applied by Hand 2.

• The ball will start moving to the left because the force applied by Hand 1 overcomes the force applied by Hand 2.

• The ball will start moving to the right because the force applied by Hand 2 overcomes the force applied by Hand 1.

 What happens if the force applied to the ball by Hand 1 is less than the force applied to the ball by Hand 2?

• The ball will start to move to the left because Hand 1 is on the left and it is weaker than Hand 2.

• The ball will start moving to the right because the force applied by Hand 1 overcomes the force applied by Hand 2.

• The ball will start moving to the left because the force applied by Hand 1 overcomes the force applied by Hand 2.

• The ball will start moving to the right because the force applied by Hand 2 overcomes the force applied by Hand 1.

 What happens if the force applied by both hands is equal in strength?

• The ball will start to move to the left because Hand 1 is on the left and it is weaker than Hand 2.

• The ball will start moving to the right because the force applied by Hand 1 overcomes the force applied by Hand 2.

• The ball will start moving to the left because the force applied by Hand 1 overcomes the force applied by Hand 2.

• The forces counteract, cancelling each other, so the ball will not move.

How does an object move when two forces counteract each other?

• The object will move in one direction and then the other. 

• The forces always cancel each other out and the object does not move at all.

• When two forces from opposite directions are acting on an object, the object will move in the direction of the stronger force.

• When forces counteract each other, the result is the forces build on one another.

What 2 vertical forces act on the last ball (Ball E)  in the cannon? 

• The magnetic force and the contact forces of the rulers. 

• The ball’s weight pushing downward and the upward contact force of the table.

• The weight of the table pushing upward and the weight of the ball pushing downward.

• The pressure of the magnet pushing on Ball E and the magnetic force pulling Ball E toward the magnet.