Semester 1 Review: Energy, Forces, Gravity and Motion

A dog walks 12 meters to the east and then 16 meters back to the west. What is the distance the dog travels?

• 28 m

• 4 m east

• 4 m west

• 4 m

Answer explanation

The dog walks 12 meters to the east and then 16 meters back to the west. The total distance traveled is 28 meters, which is the correct answer choice.

A dog walks 12 meters to the east and then 16 meters back to the west. What is the dog's displacement?

• 28 m

• 4 m east

• 4 m west

• 4 m

Answer explanation

The dog's displacement is 4 meters west because it walks 12 meters east and then 16 meters back to the west.

This object is

• moving left and slowing down

• moving left with constant velocity

• moving right and slowing down

• moving right with constant velocity

Answer explanation

The object is moving right with a constant velocity. This is the correct choice because it aligns with the given information.

This object is

• moving left and slowing down

• moving left and speeding up

• moving right and slowing down

• moving right and speeding up

Answer explanation

The object is moving left and slowing down because it is decelerating in the left direction.

Tags

NGSS.HS-PS2-1

What is kinetic energy?

• Thermal energy

• Nuclear energy

• Energy in motion

• Stored energy

Answer explanation

Kinetic energy is the energy possessed by an object due to its motion. In this case, the correct choice is 'Energy in motion'.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

What is potential energy?

• Thermal energy

• Nuclear energy

• Energy in motion

• Stored energy

Answer explanation

Potential energy is the stored energy. It refers to the energy that an object possesses due to its position or condition.

Tags

NGSS.MS-PS3-2

All objects in the universe have a gravitational attraction to each other. 

• True

• False

Answer explanation

All objects in the universe have a gravitational attraction to each other. This is true because of the force of gravity.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

What is the SI unit used to measure weight?

• Grams 

• Liters

• Pounds 

• Newtons 

Answer explanation

The SI unit used to measure weight is Newtons. It is the correct choice because Newtons is the standard unit of force in the International System of Units (SI).

What force that acts against motion and ultimately slows the roller coaster to a stop?

• Applied

• Normal

• Friction

• Magnetic

Answer explanation

Friction is the force that acts against motion and ultimately slows the roller coaster to a stop. It opposes the motion of the roller coaster, causing it to lose energy and come to a halt.

When the velocity of an object is doubled, its momentum

• remains unchanged in accord with the conservation of momentum.

• doubles

• quadruples

• decreases

Answer explanation

When the velocity of an object is doubled, its momentum doubles. This is because momentum is directly proportional to velocity.

Tags

NGSS.HS-PS2-2