Which of the following are vector quantities:
Speed
Velocity
Distance
Displacement
Acceleration
Velocity
Displacement
Acceleration
100
The slope of a position time graph represents...
velocity
100
Draw a free body diagram for an object being pulled at an angle on a horizontal surface. Assume friction.
(see picture)
100
Define:
Kinetic Energy
Potential Energy
KE: energy of motion
PE: stored energy
100
What are the two types of friction and when are each used?
Kinetic friction - object in motion
Static friction - object not in motion
200
You move east 55 meters, west 20 meters and east 5 meters.
What is your displacement?
Displacement - 40 meters east
(Total distance traveled would have been 80 meters)
200
The slope of a velocity time graph represents...
acceleration
200
Draw a free body diagram for a projectile thrown in the air (assume no air resistance)
(see picture)
200
Is work being done?
1) Holding a heavy weight.
2) Pushing on a wall.
3) Lifting up a barbell
1) No
2) No
3) Yes
200
A vector has a magnitude of 30 m and creates a 25 degree angle with the horizontal. What are the x and y components of the vector?
y: 12.68 m
x: 27.19 m
300
The vertical acceleration of a projectile just before it reaches it's highest point.
What is 9.8 m/s2
300
The area under the curve of a velocity vs time graph represents...
displacement
300
An object weighs 50 N and is pulled with 80 N to the right. The friction force is 20 N to the left. What is the acceleration of the object?
11.76 m/s2
300
What is the kinetic energy of a 300 kg car moving at 20 m/s?
60,000 J
300
A car travels 50 miles at 100 mph, and 50 miles at 50 mph. What is the average speed of the trip?
66.67 mph
400
The horizontal acceleration of a projectile just before it reaches it's highest point.
What is zero
400
Draw a velocity time graph for an object thrown straight up into the air that is caught at the same height.
(see drawing)
400
A 20 N object is pulled at a constant velocity across a level floor. If the coefficient of friction is 0.3, what is the magnitude of the pulling force?
6 N
400
A strap inclined upward at 30 degrees pulls a suitcase through the airport. If the tension in the strap is 30 N, how much work does the tension do if the suitcase is pulled 40 m?
1039.23 J
400
How much gravitational potential energy does an 80 kg hiker gain if they climb up a 1,200 m high cliff?
940,800 J
500
An car accelerates from rest at a rate of 4 m/s2. If it accelerates for 5 seconds, what is the distance the car travels?
50 meters.
500
Draw a position time graph for an object that travels from rest at constant velocity for 5 seconds, stops for 2 seconds, and then accelerates back to it's initial position.
(see drawing)
500
A 10 kg object is at rest on a 30 degree incline. What is the magnitude of the frictional force?
49 N
500
How much work does a 400 kg car do if it accelerates from rest to a speed of 30 m/s?
180,000 J
500
A planet has an acceleration of 9.8 m/s2. If the radius of the planet is doubled, and the mass of the planet is also doubled, what is the new acceleration of the planet?