Motion and Forces

A push or a pull on an object is called:

• Mass

• Matter

• Force

• Speed

Answer explanation

A push or a pull on an object is defined as a 'force'. It is the interaction that causes an object to change its motion, making 'force' the correct answer among the options provided.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A force that one surface exerts on another when the two surfaces rub against each other and causes objects to slow down or stop.

• Mass

• Motion

• Inertia

• Friction

Answer explanation

Friction is the force that surfaces exert on each other when they rub together, causing objects to slow down or stop. It opposes motion, making it the correct answer to the question.

Which of the following statements are examples of FRICTION? (Check all answers that apply.)

• Rubbing your hands together

• Dragging your sister across the floor

• Earth pulled by the Sun

Answer explanation

Friction is the resistance that occurs when two surfaces rub against each other. Rubbing your hands together and dragging your sister across the floor both involve this resistance, making them examples of friction.

The force that pulls objects toward each other is:

• Friction

• Gravity

• Balanced

• Equal

Answer explanation

The force that pulls objects toward each other is gravity. It is the natural phenomenon by which all things with mass are brought toward one another, unlike friction, which opposes motion.

Tags

NGSS.MS-PS2-4

The friction experienced by falling objects through the air is:

• Air Resistance

• Free Fall

• Gravity

• Inertia

Answer explanation

The friction experienced by falling objects through the air is known as air resistance. It opposes the motion of the object and is a key factor in determining how fast an object falls.

A unit of measure for force is called:

• Neutrons

• Newtons

• Watts

• Joules

Answer explanation

A unit of measure for force is called 'Newtons', named after Sir Isaac Newton. 'Neutrons' are subatomic particles, 'Watts' measure power, and 'Joules' measure energy, making 'Newtons' the correct choice for force.

Speed in any given direction is:

• Acceleration

• Mass

• Velocity

• Altitude

Answer explanation

Speed in any direction is defined as velocity, which includes both the magnitude (speed) and the direction of motion. Acceleration refers to the change in velocity, while mass and altitude are unrelated concepts.

If a car travels 35 miles per hour north, what is the SPEED of the car?

• 35mph

• 35 mph North

• 35 m/s

• 35 m/s²

Answer explanation

The speed of the car is 35 miles per hour, which is simply expressed as 35 mph. The direction (north) is not part of the speed measurement itself, making '35 mph' the correct answer.

If a car travels 35 miles per hour north, what is the car's VELOCITY?

• 35 mph

• 35 mph north

• north

• 35 m/s

Answer explanation

Velocity includes both speed and direction. The car's speed is 35 mph, and since it is traveling north, the correct velocity is 35 mph north, which specifies both the magnitude and direction.

Equal forces acting on an object in opposite directions; object will not move:

• Unbalanced Force

• Friction

• Gravity

• Balanced Force

Answer explanation

Balanced forces occur when equal forces act in opposite directions on an object, resulting in no movement. This is why the correct answer is 'Balanced Force', as the object remains stationary.