Show:
Kinematics
Free Fall and Projectile Motion
Newton's Laws of Motion
Circular motion
Conceptual Questions
100
A car travels 90. meters due north in 15 seconds. Then the car turns around and travels 40. meters due south in 5.0 seconds. What is speed of the car during this 20.-second interval?
6.5 m/s
100
A ball thrown vertically upward reaches a maximum height of 30. meters above the surface of Earth. At its maximum height, the speed of the ball is
0
100

An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the bug, the force of the bug on the car is _____________.

same

100

The second hand on a watch has a length of 4.50 mm. What is the speed of the end of the second hand as it moves in uniform circular motion?

4.71x10^-4 m/s

100

Object A is twice the mass of object B. Both objects are dropped off a cliff and fall under the sole influence of earth’s gravity near its surface. The acceleration of object A is ___________ the acceleration of object B

equal

200

What is the stopping distance of a car with initial speed 10.0 m/s that decelerates uniformly at a rate of 2.0 m/s^2 ?

25 m

200
A basketball player jumped straight up to grab a rebound. If she was in the air for 0.80 second, how high did she jump?
0.784 m
200

A horse pulls a cart along a flat road. Consider the following four forces that arise in this situation. (1) the force of the horse pulling on the cart (2) the force of the cart pulling on the horse (3) the force of the horse pushing on the road (4) the force of the road pushing on the horse Which two forces form an "action-reaction" pair that obeys Newton's third law?

3 and 4

200

A racecar is traveling at constant speed around a circular track. If the speed is doubled, the centripetal acceleration is A)No Change B) 2x. C)4x . D)1/2. E)1/4 

C

200

Which of the following statement(s) applies to the motion of a ball rising and then falling in free fall? I. The ball has constant acceleration as it moves upward. II. The ball has constant acceleration at the top of its path. III. The ball has constant acceleration as it moves downward.

d) I, II, and III

300
A car initially traveling at a speed of 16 meters per second accelerates uniformly to a speed of 20. meters per second over a distance of 36 meters. What is the car’s acceleration?
2 m/s^2
300
A ball is dropped from a 70 m tall tower. How long will it take the ball to hit the ground?
3.78 s
300

A 30 kg box is pulled across the floor with a force of 49 N applied at 27degrees above the horizontal. A 25. N friction force impedes the motion of the box.What will be the acceleration of the box?

0.62 m/s^2

300

A 5kg ball is swung in a horizontal circle of radius 2m.  The ball goes around the circle every 1.5 seconds, what is the centripetal force?

263 N

300

In which of the following situations would an object be accelerated? I. It moves in a straight line at constant speed. II. It moves in a circle at constant speed. III. It travels as a projectile in a gravitational field with negligible air resistance. 

D

400
An object starts from rest and accelerates uniformly in a straight line . After 11 seconds, its speed is 70.0 m/s. How far does the object travel during the first 11 seconds?
385 m
400
A tennis ball is thrown from ground level with velocity v directed 20° above the horizontal. If it takes the ball 2.5 s to reach the top of its trajectory, what is the initial velocity?
72 m/s
400

A 16.0 N force is applied at 24.0 degrees above the horizontal to a 1.5 kg brick to drag it across a table. The coefficient of sliding (kinetic) friction is 0.43. What is the acceleration of the brick?

7.4 m/s^2

400

A car of mass 800 kg moves on a flat circular track of radius 40 m. If the coefficient of friction is 0.5, then maximum velocity with which the car can move is ____________

14 m/s

400

As the angle at which a turn is banked increases, this force takes on an increasing role in the centripetal force

Normal Force

500

Calculate the resultant velocity of 10 m/s, 30 degrees North of East and 10 m/s, 60 degrees West of South.

0

500
A football is kicked with a speed of 22 m/s at an angle of 60.0° with the horizontal. What is the velocity at the highest point?
11 m/s
500

An object with a mass of 7.2 kg is allowed to slide from rest down an inclined plane. The plane makes an angle of 30 degrees with the horizontal and is 65 m long. The coefficient of friction between the plane and the object is 0.45. What is the velocity of the object at the bottom of the plane?

12m/s

500

What is the minimum velocity for a car to barely make it around a 15m loop?

12.12 m/s

500
Two identical bowling balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped 1.0 s before ball B is dropped, but both balls fall for some time before ball A strikes the ground. After ball B is dropped, but before ball A strikes the ground, which of the following is true? (A) The distance between the two balls decreases. (B) The velocity of ball A increases with respect to ball B. (C) The velocity of ball A decreases with respect to ball B. (D) The distance between the two balls remains constant. (E) The distance between the two balls increases
E