Newton's Laws
Which of Newton's Laws describes this concept:
An object will remain at rest or move at constant velocity unless acted on by an outside force.
1st Law / Inertia
On a free-body diagram, this downward arrow represents the force caused by Earth.
Gravity / Weight
A right triangle has legs of 3 N and 4 N. What is the magnitude of the hypotenuse?
5 Newtons
In SOH-CAH-TOA, this trig function equals opposite ÷ hypotenuse.
Sine / Sin
What word becomes shorter when you add two letters to it?
Short
A 5 kg object accelerates at 4 m/s². What is the net force acting on it?
20 Newtons
(F = M x A)
A book rests motionless on a table. What upward force balances its weight?
Normal Force
Two perpendicular forces of 6 N and 8 N act on an object. What is the hypotenuse?
10 Newtons
A 10 N force acts at 60° above the horizontal. What equation would you use to find its horizontal component?
(Write the equation with numbers plugged into it, not just the trig function)
Fx = 10cos60∘
A man shaves several times a day but still has a beard. Who is he?
A Barber
When you push backward on the ground while walking, the ground pushes you forward. Which Newton’s Law explains this?
Newton's 3rd Law / Normal Force
A box is being pushed to the right across a rough floor. Name the four forces that would normally appear on its free-body diagram.
Gravity, Normal, Applied, Friction
A right triangle has legs of 9 N and 12 N. What is the magnitude of the hypotenuse?
15 Newtons
A 20 N force acts at 30° above the horizontal. What is its vertical component?
10 Newtons
(20sin30∘=10)
What begins with P, ends with E, and contains thousands of letters?
Post Office
A 10 kg object has 70 N of force pulling right and 30 N pulling left. What is its acceleration?
4 m/s2
70-30 = 40 N -> 40N/10kg = 4 m/s2
What is the number associated with the force of gravity?
9.8 m/s2
A hypotenuse is 13 N and one perpendicular component is 5 N. Find the other component.
12 Newtons
A ramp is 10 m long and rises 6 m vertically. What is the angle the ramp makes with the ground?
≈36.9°
sin-1(6/10)
What has 13 hearts but no lungs, stomach, or brain
A deck of cards
A 1,000 kg car accelerates from rest at 3 m/s². Friction forces total 500 N. How much forward force must the engine provide?
3500 Newtons
1000 x 3 = 3000 -> 3000 + 500 = 3500
A 50 N object hangs motionless from a rope. What is the tension in the rope?
50 Newtons
A hypotenuse is 25 N and one perpendicular component is 15 N. Find the other component.
20 Newtons
A 50 N force acts at an unknown angle above the horizontal. Its horizontal component is 40 N. Find the angle.
≈36.9°
cosθ=40/50
You see a boat filled with people, but there isn’t a single person on board. How is that possible?
Everyone on the boat is married