Unit 4 TEST

A cart with a marble on the top is being pushed to the right. Which of the following statements describes the motion of the marble on the cart? 

• The marble seems to move to the right because the force of the cart is applied to the right.

• 1. The marble seems to move to the right because the cart moves to the right.

• 1. The marble seems to move to the left because of its inertia resisting the motion.

• 1. The marble seems to move to the left because the force is applied to the left.

Tags

NGSS.MS-PS2-1

What spring will have the greatest displacement?

• Spring A

• Spring B

What is the spring constant of the spring

• 8 g/cm

• .8 g/cm

• 800 g/cm

• 1.25 g/cm

If a biker rides west for 80 miles from his starting position, then turns and bikes back east 25

miles. What is the biker’s net displacement?

• 55 miles west

• 55 miles east

• 105 miles east

• 105 miles west

A ball is rolling on a straight path. Is there only one correct frame of reference to describe the ball's motion?

• Yes, there is a single, correct frame of reference because motion is a relative term.

• No, there is not a single, correct frame of reference because motion is a relative term.

• Yes, there is a single, correct frame of reference, which is in terms of Earth’s position.

• No, there is not a single, correct frame of reference because motion does not need a frame of refrence.

What is the average speed of a car that travels 95 miles in 4 hours?

• 23 mi/hr

• 0.04 mi/hr

• 380 mi/hr

• 23.75 mi/hr

Answer explanation

Speed = distance ÷ time

Tags

NGSS.MS-PS3-1

Which of the following is NOT a vector quantity?

• Distance

• Force

• Displacement

• Velocity

Which of the following are examples of vector quantities?

• Force and displacement

• Force and distance

• Displacement and speed

• Speed and mass

Answer explanation

A vector quantity is an arrow that shows direction and magnitude. Example: drawing an arrow to show 50N left and 30N right.

What is the net force of the box?

• 6N right

• 5N left

• 1N right

• 1N left

Answer explanation

4N and 2N are going in the same direction so it collectively makes 6N to the right. 5N is going in the OPPOSITE direction so you must subtract!

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which of the following describes the motion of the box?

• Upwards at a constant speed

• Downwards at a constant speed

• Upwards and at constant acceleration

• Downwards at a constant acceleration

Answer explanation

We are dealing with FORCE! And force equals mass times acceleration. So, the box is moving at a constant acceleration, maintaining a constant mass, and a constant force of 15N upwards.

Tags

NGSS.MS-PS2-2