Newton's Laws of Motion

Name that law: Law of Inertia

• 1st Law of Motion

• 2nd Law of Motion

• 3rd Law of Motion

• Law of Universal Gravitation

Answer explanation

Newton's First Law is also called the Law of Inertia.

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Newton's 1st Law

Name that law: If you use the same force to push a truck and push a car, the car will accelerate more than the truck.

• 1st Law of Motion

• 2nd Law of Motion

• 3rd Law of Motion

• Law of Universal Gravitation

Answer explanation

This question is comparing the acceleration of two objects with different masses. The object with less mass accelerates more (mass and acceleration are inversely proportional)

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Newton's 2nd Law

What is the mass of an object (on a frictionless surface) that accelerates at 12.2 m/s/s when a 2.7 N push force is applied?

• 0.221 g

• 0.221 kg

• 4.52 g

• 4.52 kg

Answer explanation

$m=\frac{F}{a}$

$m=\frac{2.7\ N}{12.2\ \frac{m}{s^2}}$
$m=0.221\ kg$

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Newton's 2nd Law - Calc

A 21 kg object is falling with 92 N of air resistance. What is the net acceleration of the object?

• -5.42 m/s/s

• -3.67 m/s/s

• 3.67 m/s/s

• 5.42 m/s/s

Tags

Newton's 2nd Law - Calc

MultiStep

Weight - Calc

Net force - Calc

Name that law: When a person trips on a rock, they fall forward.

• 1st Law of Motion

• 2nd Law of Motion

• 3rd Law of Motion

• Law of Universal Gravitation

Name that law: When jumping off a canoe to land on the dock, the canoe travels backwards after you jump forwards.

• 1st Law of Motion

• 2nd Law of Motion

• 3rd Law of Motion

• Law of Universal Gravitation

An object that has a net force of 0 N has what acceleration?

• Less than 0 m/s/s

• Greater than 0 m/s/s

• Equal to 0 m/s/s

• Not enough information to answer

A rock climber pulls down on the wall (action force). What is the reaction force?

• The wall pushing down on the climber.

• The climber pushing up on the wall.

• The climber pulling down on the wall.

• The wall pushing up on the climber.

A car is driving south and hits a tree. What is the direction of the reaction force?

• East

• West

• North

• South

What is the net force of a 2.1 kg cat that accelerates at 12.1 m/s/s.

• 0.174 m/s/s

• 0.174 N

• 5.76 N

• 25.4 m/s/s

• 25.4 N