Third quiz on Force and Motion

Which of these has an unbalanced force?

• a book sitting undisturbed on a desk
• a child standing in a line that is not moving
• a ball slowing down as it rolls on the ground along a straight line
• a meteoroid moving at a constant speed and direction through outer space

Tags

NGSS.MS-PS2-2

Luis rubbed a balloon on his hair and held the balloon next to the wall.  he observed the balloon stick to the wall. Which of the following is responsible for the balloon sticking to the wall?

• gravity
• friction
• electric force
• magnetic force

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

The graph shows the motion of a cart. When is the cart moving forward at a constant speed?

• AB
• DE
• CD
• BC

If there is no force acting on an object, it will______

• move at the same speed

• move in the same direction

• move with the same speed AND direction

• eventually slow down and stop

Which of the following describes (states) an object that is speeding up? The object is ________.

• decelerating

• accelerating

• in a frictionless environment

• moving with constant speed

Imagine you could throw a ball in a frictionless environment such as outer space. Once you let go of the ball, what will have happened to the ball according to the Law of Inertia (Newton’s 1^st Law)?

• It will travel in a straight line forever.

• It will travel in a straight line but eventually slow down.

• It will continue to speed up forever.

• It will slow down and turn.

How does Newton’s first law of motion apply to a ball rolling across the gym floor after an unbalanced force is applied?

• The ball will stop at the line halfway across the gym.

• The ball will continue to roll until an unbalanced force in applied.

• The ball will start bouncing until it hits the wall.

• The ball will roll in a zigzag pattern to the other end of the gym.

The law requires all people riding in a car to wear seat belts. If the car suddenly stops, the seat belts hold the passengers in place. How does Newton’s first law of motion apply when a person is not wearing a seat belt?

• The passengers will continue moving forward due to inertia.

• The passengers will move backward into the seat.

• The passengers will lean into another passenger’s seat.

• The passengers will not be affected by the sudden stop of the car.

When a car suddenly stops at a red light, a book lying on the car seat slides forward. Why does the book continue to move forward?

• The book loses its backward force.

• The car moves in reverse more rapidly than the book.

• The friction of braking transfers energy to the book.

• The book’s inertia causes it to continue moving.

Who is the scientist that developed the three laws of motion?

• Alexander Graham Bell 
• Benjamin Franklin
• Sir Isaac Newton
• Sir Smith Scott