6th_Unit 4 Review Quiz

According to Newton’s third law of motion, if someone jumps off a skateboard, the skateboard will roll backward because –

• the mass of the skateboard is the same as the mass of the person jumping off

• the pull of gravity on the person is the same as on the skateboard, regardless of size.

• the air resistance on the person is great and the friction on the skateboard is small.

• the force that sent the person forward, there is an equal force pushing back on the skateboard.

Tags

NGSS.MS-PS2-1

Which two characteristics are most useful for determining its elastic potential energy of a stretched rubber band?

• The length to which the rubber band is stretched and the mass of the rubber band

• The length to which the rubber band is stretched and the forced used to stretch it

• The mass of the rubber band and the force used to stretch it

• The force used to stretch the rubber band and its height above the ground

A 200-gram mass is attached to a spring. The spring is attached to a stand that rests on a table. The elastic potential energy of the spring would be changed if which of the following changes were made?

• Replacing the mass with a 400-gram mass

• Attaching the spring closer to the stand

• Using a stand that is 50 centimeters tall

• Moving the stand to a taller table

Some forms of potential energy are stored in the bonds between atoms and molecules, stored inside the nucleus of an atom, stored in a compressed or stretched object, or stored in the gravitational field between an object and Earth. A diagram of a moving pendulum is shown below. Which position of the pendulum would have the least amount of potential energy?

• 1 and 5

• Only 3

• 2 and 4

• Only 5

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NGSS.MS-PS3-2

Two objects are sitting on a table. Which of the two objects will have the greater gravitational potential energy?

• The larger object

• The smaller object

• The object with more mass

• The object with less mass

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NGSS.MS-PS2-4

Which graph correctly shows the relationship between an object’s height from the ground and its gravitational potential energy (PE)?

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An amusement park ride uses electricity to make its motor spin. The ride also makes noise and lights up. Which observation of the amusement park ride demonstrates the law of conservation of energy?

• The amount of energy used by the amusement park ride is greater than a water-log ride

• The amount of electrical energy used equals the total amount of mechanical, sound, and light energy produced.

• The amusement park ride only uses energy when it has a full group of riders on it.

• The amount of energy used by the ride is less than the total amount of energy produced as the motor spins.

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

Energy is always conserved. It cannot be created or destroyed. It can, however, be transferred between objects or systems, from one form to another. Which of the following is true of the relationship between kinetic and potential energy?

• When a system loses kinetic energy, it loses potential energy.

• As kinetic energy decreases, potential energy decreases.

• When a system gains kinetic energy, it loses potential energy.

• As kinetic energy increases, potential energy increases.

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NGSS.MS-PS3-5

James is investigating magnets and movement. He has two magnets and an iron nail. If James wants to illustrate how magnetic force can make things repel each other, which arrangement of objects should he use?

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NGSS.MS-PS2-3

What is the net force of the box shown below? Select TWO correct answers.

• 10 Newtons

• 60 Newtons

• 50 Newtons

• to the left

• to the right

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NGSS.MS-PS2-2