d, v, a, t
Fill in the blank:
v = Δd / Δ_____
v = Δd / Δt
TRUE OR FALSE:
Gravity is always pointed down on a FBD
TRUE
Complete Newton's 2nd Law:
_____ = m*a
F = m*a
What units do we usually use for time in Physics?
Seconds (s)
How many centimeters are in a meter?
100 cm
Fill in the blank:
a = Δ_____ / Δt
a = Δv / Δt
TRUE OR FALSE:
Friction and drag are always pointed in the opposite direction as the object's motion
TRUE
Moses drops a calculator out of the window (classic Moses). What force(s) are acting on the calculator when it's in the air?
Gravity
(+100 for air resistance!)
What units do we usually use for displacement in Physics?
Meters (m)
How many meters are in a kilometer?
1,000 m
A driver starts his parked car and within 5 seconds reaches a speed of 17 m/s, as he travels east. What is his acceleration?
3.4 m/s2
TRUE OR FALSE:
Normal force is ALWAYS pointed upwards
FALSE
(+100 if you say whether it's parallel or perpendicular to the ground surface)
Dezmond kicks a 0.4 kg football with a force of 1000 N. What is the acceleration of the football?
2500 m/s2
What units do we usually use for velocity in Physics?
Meters per second (m/s)
How many millimeters is in a centimeter?
10 mm
Derrick walks down the hall at a constant velocity of 1.6 m/s. How long does it take for him to walk 25 meters?
~15.6 seconds
TRUE OR FALSE:
The applied force is ALWAYS in the direction of the object's motion
FALSE
(+200 if you can come up with an example of the applied force going the opposite direction of the motion)
A skydiver of mass 70kg has jumped out of a plane two miles above the surface of the earth. After 20 seconds, he has reached terminal velocity, meaning he is no longer accelerating. What is the net force on the skydiver?
0 N
What units do we usually use for acceleration in Physics?
Meters per second squared (m/s2)
How many centimeters are in a kilometer?
100,000 cm
An irresponsible driver is texting while driving on the highway, where the speed limit is 70 mph (or 31 m/s). In the 5 seconds it takes to send a text, how many meters has the driver covered with their eyes off the road?
155 meters
(a football field is 105 meters long)
Ms. Thron is successfully pushing a car up an incline (she's strong like that). Draw a FBD of this situation.
Gravity -- Arrow down
Normal Force -- Perpendicular to the ground
Applied Force -- Uphill
Friction -- Downhill
A skydiver of mass 70kg is strapped to another skydiver of unknown mass. If they are accelerating at 4 m/s2 with a net force of 540 N acting on them, what is the mass of the other skydiver?
65 kg
What units do we usually use for force in Physics?
Newtons (N)
+200 if you can write the equivalent of what a Newton is in terms of m, s, and kg
How many millimeters are in a kilometer?
1,000,000 millimeters!