One Dimensional Kinematics
Is "6 m [north]" a scalar or a vector?
Vector
Bobby goes on a 30 minute walk. On his walk he goes 425 meters [W], then 123 m [S]. What is her total displacement with the angle?
What is the difference between mass and weight?
Mass is the amount of matter an object has, weight is the way gravity affects the mass of the object
How much work is done when you lift a briefcase with a constant force of 19.6 N [up], as you walk 450 m [E] to a job interview?
A dodgeball of mass 0.385 kg is thrown horizontally against a wall at 9.5 m/s [W]. It rebounds at 7.6 m/s [E]. This occurred over 180 ms. What is the impulse?
6.58 kgm/s
Convert "Eastward velocity of 19 km/h" into proper vector notation
v=19 km/h [E]
Johnny is using a slingshot. If Johnny shoots a rock horizontally with an initial speed of 29 m/s from a height of 1.2 meters off the ground, determine the rock's total air time.
0.495 seconds
What is the force of gravity acting on a 55 kilogram wolf?
-539 N
A heavy cardboard box (m = 53 kg) is pushed along a 12 m long concrete driveway (μk = 0.38). The deliverer applies a force of 210 N. Determine the work done by the deliverer.
2520 J
Two hockey players collide on the open ice. Player A has mass 95 kg and was initially traveling at 6.2 m/s [N] before colliding with Player B of mass 82 kg. After the collision, they are traveling together at 3.4 m/s [N]. What was Player B’s initial velocity?
0.16 m/s [N]
You cycle 250 m [E], then 1040 m [W], then 520 m [E]. What is your total displacement?
270 m [W]
A biker maintains a constant speed of 3.5 m/s while turning from East to South. If the turn takes 3.9 seconds, what is the average acceleration over that time?
1.27 m/s2
Determine the normal force acting on a orange that weighs 250 grams, that is at rest on a table.
2.45 N
A desktop computer has a powerful rating of 400 W. If it is left on for one day, how much energy did it use?
34,560,000 J
A not-so-great firework is launched into the air. When it is momentarily stationary at the top of its flight, it bursts into two pieces of equal mass. One piece has a final velocity of 23 m/s [L17U]. Determine the final velocity of the other piece immediately after the explosion.
23 m/s [R17D]
A driver looks away from the road to send a text, this takes 4.4 seconds.If the car was travelling at 115 km/h, how far did the car go while the driver was looking at their phone?
140.54 meters
An airplane travelling 2001 meters above the ocean at 135 km/h is going to drop supplies to a group on a island below. How many seconds before the plane is directly overhead should the box of supplies be dropped?
20.3 seconds
A 2250 kilogram car with rubber tires is driving on concrete. How much force must be applied by the engine to keep the car moving at a constant speed?
22,050 N
Determine the kinetic energy gained by an ATV (m = 285 kg) as it accelerates from 2.6 m/s to 8.1 m/s.
8386.125 J
An initially stationary hockey puck (160 grams) has a force applied to it over 1.5 seconds. It is released with a velocity of 27 m/s [forward]. Determine the magnitude of the applied force.
2.88 N
A running back changes direction from running 4.5 m/s [N] to 4.5 m/s [S] over 8 seconds. What is the acceleration of the running back during that time?
1.13 m/s2
You and your friends are on a a train going 25 km/h [N], all relative to you, your friend Billy walks toward the front of the train at 2.4 m/s and your friend Joe runs toward the back of the train at 4.5 m/s, there is also a stationary observer outside.
a) What is the velocity of the train relative to the stationary observer?
b) What is Billy's velocity relative to the stationary observer?
a) 6.9 m/s [N]
b) 9.3 m/s [N]
Two masses are connected by a rope across two pulleys. If m1=23.7 kg and m2=25 kg, determine the magnitude of acceleration of the masses.
0.262 m/s2
A 73 kg skier is at the top of a 65 m high hill. The skier is stationary to begin with, then slides down the hill to the bottom. What is the total energy of the skier?
46,501 J
What are the three kinds of collisions?
Elastic, Inelastic, completely inelastic