S24 16.1 on Understanding Car Crashes - It's Basic Physics

When the truck began moving, the crash dummy fell off the back. What is the property of matter that caused the dummy to resist a change in motion?

• inertia
• momentum
• speed
• force

Isaac Newton's First Law of Motion states that an object at rest remains _______ unless acted upon by an external force.

• in motion
• frozen
• at rest
• moving

Isaac Newton's First Law of Motion also states that a body in motion continues to move at a constant _______ in a straight line unless acted upon by an external force.

• speed
• inertia
• curve
• stationary

Newton explained the relationship between crash forces and inertia in his ______ Law of Motion.

• first

• second

• third

Momentum is inertia in motion. It is the product of an object's mass and its _________.

• interia
• velocity
• size
• force

Is the following statement true or false? Since momentum is the quantity of motion, all vehicles moving at the same speed will have the same momentum.

• true
• false

Impulse is the product of ______ and the time interval during which the force acts.

• momentum
• interia
• mass
• force

Throwing an egg against the wall made it break because the wall applied a larger force over a shorter time.

• true
• false

Against the sheet, the egg did not break because the sheet applied a small force over a longer time.

• true
• false

People often refer to g's as forces, but they are not. Instead, a "g" is a standard unit of __________.

• impulse
• acceleration
• inertia
• distance