Day 3 STAAR® Blitz Warm-Up: Force, Motion, and Energy

An object’s stored energy or energy of position

• Balanced force

• Kinetic energy

• Potential energy

• Unbalanced force

Answer explanation

The correct answer is Potential energy, which refers to the stored energy or energy of position in an object. This energy can be converted into kinetic energy when the object is in motion.

Tags

NGSS.MS-PS3-2

Equal forces acting on an object; net force equals zero

• Balanced force

• Kinetic energy

• Potential energy

• Unbalanced force

Answer explanation

Balanced forces occur when equal forces act on an object in opposite directions, resulting in a net force of zero. This means the object remains at rest or continues to move at a constant velocity.

The energy objects and particles have due to their motion

• Balanced force

• Kinetic energy

• Potential energy

• Unbalanced force

Answer explanation

Kinetic energy is the energy an object possesses due to its motion. It is directly related to the speed and mass of the object, making it the correct choice for describing energy from motion.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Unequal forces acting on an object; net force does not equal zero

• Balanced force

• Kinetic energy

• Potential energy

• Unbalanced force

Answer explanation

Unequal forces acting on an object result in a net force that does not equal zero, which defines an unbalanced force. This leads to acceleration or change in motion, unlike balanced forces that cancel each other out.

Tags

NGSS.MS-PS2-2

Part A Which statement best describes the resulting motion of the block?

• The block will move to the right at a constant speed.

• The block will move to the right at an increasing speed.

• The block will move to the left at a constant speed.

• The block will stop moving.

Answer explanation

The block will move to the right at an increasing speed because it is likely experiencing a net force in that direction, causing its velocity to increase over time.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Part B Which statement provides evidence to support Part A?

• Unbalanced forces are acting on the block.

• Balanced forces are acting on the block.

• Gravity is the force that opposes motion.

• The applied force is less than the force of friction.

Answer explanation

The statement "Unbalanced forces are acting on the block" supports Part A by indicating that the net force is not zero, which is necessary for motion to occur. This aligns with the concept of acceleration due to unbalanced forces.

Tags

NGSS.MS-PS2-2

Which table best compares the amounts of potential energy and kinetic energy of the snowboarder at each position?

• 
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• 
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Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-4

Which action represents a conversion of chemical energy into mechanical energy?

• Pancakes reheated in a microwave oven

• Soup beginning to boil on a stove

• A grasshopper jumping from a predator

• Sunlight melting an icicle

Answer explanation

A grasshopper jumping from a predator converts stored chemical energy from its muscles into mechanical energy for movement, making it the correct choice. The other options involve thermal energy, not mechanical.