Vectors
Name 3 vector and 3 scalar quantities.
Vectors: Force, Displacement, Acceleration, Velocity
Scalars: Mass, Speed, Distance, Time
When launching an object in projectile motion, what variable remains the same in the horizontal "x" direction?
The Horizontal velocity.
Provide two examples of a contact force and two examples of a non contact force.
contact- applied, spring, friction, normal, drag (air)
non-contact- gravitational, magnetic, electric
Which law states force is dependent on the mass and acceleration of an object?
Newton's 2nd Law
You walk 50 m across a field at an angle of 55 degrees northeast. What will be your horizontal component?
28.68 m
You are walking north 22 m to your friends house, next you make a turn east and walk 7 m to arrive the location. Find the resultant vector with direction.
23.08 m NE
What is the acceleration of an object in the horizontal "x" direction in when launched off a cliff?
None, 0
The units for weight is...?
Newtons (N)
If you double the force of an object what happens to the acceleration?
Increases
You are given a horizontal component of 3 m/s and a vertical component of 9 m/s, what will be your resultant velocity?
9.49 m/s
Is the following statement a scalar or vector represenation: "The football player was running 10 miles an hour towards the end zone."
"towards" = Vector
A bowling ball rolls off the end of a table with a velocity of 5 m/s. The table is 3 m off of the ground.
What is the time it takes for the ball to reach the ground?
.78 s
In the following example, which forces are acting on the object and what is the direction of each of the forces?
"A skydiver is descending with a constant velocity. Consider air resistance."
Gravitational force (downward)
Air Resistance (or drag) (upward)
Newton's first law is also known as....?
"Law of Inertia"
A rock is kicked at 35 degrees from the horizontal with an initial velocity of 10 m/s. What is the x-component of the ball’s initial velocity and what is the y-component of the ball’s initial velocity?
x component 8.19 m/s
y component 5.74 m/s
While driving to the store, you drive 25 miles east and then 27 miles South. What is the magnitude and direction of the displacement you traveled?
36.79 m at 42.8 or 47.2 degrees
An object is projected horizontally at 14.0 m/s from the top of a 200 m cliff. How far from the base of the cliff will the object strike the ground?
89.42 m
A 15 kg chair initially at rest on a horizontal floor requires a 125 N horizontal force to set it in motion. Once the chair is in motion, a 118 N horizontal force keeps it from moving at a constant velocity.Find the coefficient of static friction between the chair and the floor.
.85
Your shopping cart has a mass of 55 kilograms. In order to accelerate the shopping cart down an aisle at 0.4 m/s2, what force would you need to use or apply to the cart?
22 N
A wagon is pulled at a constant velocity across a horizontal show surface. If a force of 108 N is being applied to the wagon at an angle of 48 degrees to the ground, what is the force of friction between the sled and the snow?
76.37 N
Mac and Tosh are doing the Vector Walk Lab. Starting at the door of their physics classroom, they walk 2.0 meters, south. They make a turn and walk 16.0 meters, west. They turn again and walk 24.0 meters, north. They then turn and walk 36.0 meters, west. What is the magnitude of their overall displacement?
56.5 m at 22.9 or 67.1 degrees
An object is shot with a velocity of 30 m/s at an angle of 18°.
What is the maximum height the projectile reaches?
4.39 m
A 8 kg wagon is accelerating (being pulled) to the right with 12 N of force. Between the tires and the ground, there is 8 N of friction.
Determine the acceleration of the wagon.
.5 m/s2
You apply a force of 5N to a 7.26kg bowling ball. Following your push the ball rolls down the lane at 3.8 m/s. How long did you push the ball in this situation?
5.51 s
A person is pulling a box with a force 39 degrees above the horizontal. If the horizontal component of the box if 50 N, what is the force exerted on the handle?
64.10 N