Sarah drives an average of 45 mph for 4 hours. How far does she go?
180 miles
100
Draw a position graph that shows forward motion speeding up.
Move upward and get steeper.
100
Guillermo pushes a 5 kg box to the left with a force of 500 N. The force of friction is 450 N. Find the acceleration (with direction) of the box.
10 m/s^2
100
A 10-kg wagon is pulled with a force of 76 N at an angle of 30 degrees with the horizontal. Find the normal force acting on the wagon from the ground.
60 N
100
Give an example of how inertia affects your daily life.
Determined by teacher.
200
Jacob can run 1500 m at 5 m/s. How long does it take him?
300 seconds or 5 minutes
200
Determine the average speed for the following graph
1.4 m/s
200
Brittani pushes a 2-kg box across a table with a force of 15.8 N. The coefficient of friction between the box and the table is 0.5. Find the acceleration of the box.
3 m/s^2
200
A 20,000-N car sits at rest on a hill that has a coefficient of friction of 0.2. If the hill is at an incline of 60°, what is the normal force acting on the car?
10,000 N
200
A force of 40 N is needed to keep a 10-kg steel box sliding across a level floor with a constant velocity of 8 m/s. What is the net force on the box?
a. 400 N
b. 320 N
c. 40 N
d. 80 N
e. 0 N
e
300
A car starts from rest and accelerates for 3 seconds over a distance of 40.5 m. Determine the acceleration of the car.
9 m/s^2
300
Determine the instantaneous velocity of 4 seconds for the graph on the board.
-3 m/s
300
A 98-N soccer ball falls to the ground and speeds up at a rate of 5 m/s^2. Find the force of air resistance acting on the soccer ball.
48 N
300
A 2-kg box sits on a frictionless hill with an incline of 30 degrees. Find the acceleration of the box as it slides down the hill.
4.9 m/s^2
300
A box sits on an inclined hill as shown in the picture to the right. As the angle of the incline decreases, what happens to the amount of support that the box receives from the ground?
a. increases
b. decreases
c. stays the same
a
400
The observation deck of tall skyscraper 490 m above the street. Determine the time required for a penny to fall from the deck to the street below.
10 seconds
400
Describe the following graph by choosing direction of motion, what is happening to the speed, sign of velocity, and sign of acceleration.
Backward, Speeding Up, Negative, Positive
400
A skydiver falls with his parachute open so that the air provides a force of magnitude F to slow him down at a rate of a. Develop an expression in terms of only a, F, and g for the skydiver’s mass.
F/(g+a)
400
A 100-kg wagon is pulled with a force of 400 N at an angle of 30 degrees above the horizontal. If the wagon moves with constant speed, what is the coefficient of kinetic friction between the wagon and the road?
0.44
400
An object is accelerating at a rate of 8 m/s^2. The net force exerted upon it increases by a factor of 3 and its mass increases by a factor of 4. What is the new acceleration?
a. 96 m/s^2
b. 6 m/s^2
c. 0.67 m/s^2
d. 10.67 m/s^2
e. 15 m/s^2
6 m/s^2
500
Cynthia can jump on a trampoline with an initial speed of 5 m/s and reach a final height of 10 m. Determine her total hang time for the jump (you can round the acceleration of gravity to 10 m/s^2 instead of 9.8 m/s^2)
1 second
500
Describe the following graph by choosing direction of motion, what is happening to the speed, sign of velocity, and sign of acceleration.
Forward, Slowing Down, Positive, Negative
500
Jee slides into home base and slows down at a rate of 4.9 m/s^2. Find the coefficient of kinetic friction of the dirt.
0.5
500
What is the lowest coefficient of friction that could keep my car still on a 30 degree hill?