# 2 pt 3 pt 4 pt 5pt 1 pt 2 pt 3 pt 4 pt 5 pt 1 pt 2pt 3 pt 4pt 5 pt 1pt 2pt 3 pt 4 pt 5 pt 2 pt 4 pt 6 pt 8 pt 10 pt 1pt Vocabulary Words Describing Motion.

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2 pt 3 pt 4 pt 5pt 1 pt 2 pt 3 pt 4 pt 5 pt 1 pt 2pt 3 pt 4pt 5 pt 1pt 2pt 3 pt 4 pt 5 pt 2 pt 4 pt 6 pt 8 pt 10 pt 1pt Vocabulary Words Describing Motion Forces Laws of Motion Challenge Questions

The distance and direction between the starting point and the ending point

DISPLACEMENT

Distance traveled divided by the amount of time that is needed to travel that distance

SPEED

Forces that cancel each other out because they are equal and acting in opposite directions

BALANCED FORCES

The pull that all objects with mass exert on other matter

GRAVITY

An object’s tendency to resist changing its motion, depends on the amount of mass an object has

INERTIA

All motion involves a change of ____.

POSITION

On a long trip, you cover 3,600 km in about 50 h. What was your average speed for the trip?

72 km/h

If you walk 200 m north, then 275 m south, what is your total distance walked?

475 m

A change in speed, a change in direction, or both

ACCELERATION

Why is a reference point needed to describe motion?

A REFERENCE POINT IS NEEDED TO MEASURE MOTION

A push or a pull that has a size and direction

FORCE

Motion only occurs with this kind of force

UNBALANCED FORCE

The force that resists motion between two touching surfaces

FRICTION

When you sit, gravity pulls you toward the ground. Are the forces balanced or unbalanced? WHY?

BALANCED, BECAUSE YOUR MOTION IS NOT CHANGED

Explain the difference between mass and weight

Mass is the amount of matter an object has. Weight is a measure of gravitational force

The Laws of Motion were explained by this person

SIR ISAAC NEWTON

The law that states for every action force, there is an equal and opposite reaction force

NEWTON’S THIRD LAW OF MOTION

The law that states that an object will remain at rest, or keep moving in a straight line at a constant speed, unless an unbalanced force acts on it.

NEWTON’S FIRST LAW OF MOTION

On Earth, what two forces keep objects from moving in a straight line with a constant speed?

GRAVITY AND FRICTION

What does Newton’s second law of motion state?

An unbalanced force acting on an object causes the object to accelerate in the direction of the force

Force is measured in what?

NEWTONS (kgm/s²)

When you jump upward, you slow down and eventually fall back to Earth. Which law of motion explains this?

THE SECOND LAW OF MOTION

A runner jogs north at a constant speed of 8 km/h. She turns around and heads south, keeping her speed the same at 8 km/h. Did the runner accelerate? WHY OR WHY NOT?

Yes, she accelerated because the direction of her motion changed.

What force is needed to move a 15 kg box 2.5 m/s²?

37.5 Newtons

A 20-N force is applied to a 5 kg object. It does not change its motion. What could explain this?

The force is balanced by an equal force in the opposite direction

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