a car goes forward along a level road at constant velocity. the additional force needed to bring the car into equilibrium is:

Back

2.0 kg

Front

a plane 5 meters in length is inclined at an angle of 37 degrees, as shown above. a block of weight 20 N is placed at the top of the plane and allowed to slide down. the mass of the block is most nearly

Back

Fg-Fsin0

Front

a block of weight Fg is pulled along a horizontal surface at constant speed v by a force F, which acts at an angle of 0 with the horizontal, as shown above. the normal force exerted on the block by the surface has magnitude:

Back

4.9 m/s*s

Front

a person who weighs 150 lbs (672 N) when standing still. he observes that he weighs 225 lbs (1008 N) on an elevator moving upward. what is the acceleration of the elevator?

Back

I and II only

Front

the sum of the forces on the object is zero in which of the cases?

Back

2Wcos0

Front

when an object of weight w is suspended from the center of a massless string as shown above, the tension at any point in the string is:

Back

16 N

Front

a plane 5 meters in length is inclined at an angle of 37 degrees, as shown above. a block of weight 20 N is placed at the top of the plane and allowed to slide down. the magnitude of the normal forces exerted on the block by the plane is most nearly:

Back

1,000 newtons

Front

a 0.25 kilogram ball is observed to accelerate at 4,000 m/s*s as it is hit with a bat. how much force is exerted on the bat by the ball?

Back

g/4

Front

a block of mass 3m can move without friction on a horizontal table. this block is attached to another block of mass m by a cord that passes over a frictionless pulley, as shown above. if the masses of the cord and the pulley are negligible, what is the magnitude of the acceleration of the descending block?

Back

cart #1 has half the mass of cart #2

Front

an experiment compares the time it takes to accelerate two carts from 1m/s to 2m/s. different amounts of force are tested. the table below lists the results of the experiment. what conclusion is supported by the results of the experiment?

Back

5 N

Front

there are six books in a stack, and each book weighs 5N. the coefficient of static friction between the books is 0.2. with what horizontal force must one push to start sliding the top five books off of the bottom one?

Back

2.0 kilograms

Front

an object is observed to have an acceleration of 2 m/s*s when a net force of 4 newtons is applied. the mass of the object is:

Back

the object with the greater mass will experience a smaller acceleration, and the object with less mass will experience a greater acceleration.

Front

according to Newton's second law, when the same force is applied to two objects of different masses...

Back

4.0 m/s*s

Front

in a lab, a block weighing 80N is attached to a spring scale, and both are pulled to the right on a horizontal surface, as shown above. friction between the block and the surface is negligible. what is the acceleration of the block when the scale reads 32N?

Back

6.00 m/s*s

Front

an airplane with a mass of 1.20x10^4 kg tows a glider with a mass of 0.60x10^4 kg. if the airplane propellers provide a net forward thrust of 3.60x10^4, what is the acceleration of the glider? (disregard friction.)

Back

12 newtons

Front

three forces are acting on an object as shown in the diagram. the object is not moving. two forces are 2 newtons and 10 newtons. the third force is:

Back

4050 N

Front

in the free-body diagram shown above, which of the following is the gravitational force acting on the balloon?

Back

0.2

Front

a force of 5N is required to slide a block at a constant speed over the dry surface of a table. the block has a mass of 2.5 kg. the coefficient of sliding friction is:

Back

T1<T2

Front

a ball of mass m is suspended from two strings of unequal length, as shown above. the tensions T1 and T2 in the strings must satisfy which of the following relations?

Back

she must apply force with her skates to turn or stop

Front

an ice skater feels very little force as she moves in a straight line on her skates. according to newton's first law, which of the following statements about her motion is true?

Back

the total force acting on the object is zero

Front

the graph shows the motion of an object moving in a straight line. from the graph, you may conclude that:

Back

I only

Front

three forces act on an object. if the object is in translational equilibrium, which of the following must be true?

Back

M(mg+Tsin0)

Front

a push broom of mass m is pushed across a rough horizontal floor by a force of magnitude T directed at angle 0 as shown above. the coefficient of friction between the broom and the floor is M. the frictional force on the broom has magnitude:

Back

2.14 m/s*s

Front

two perpendicular forces, one of 45.0 N upward and the other of 60.0 N directed to the right, act simultaneously on an object with a mass of 35.0 kg. what is the magnitude of the resultant acceleration of the object?

Back

to the left at 2 m/s*s

Front

three forces act on he cart shown in the diagram. the acceleration of the cart is:

Back

6.7 m/s*s

Front

a rope of negligible mass supports a block that weighs 30N, as shown above. the breaking strength of the rope is 50N. the largest acceleration that can be given to the block by pulling up on it without breaking the rope is most nearly:

Back

6N

Front

a 2 kg block slides down a 30 degree incline as shown above with an acceleration of 2 meters per second squared. the magnitude of the frictional force along the plane is most nearly

Back

friction= angle backwards
normal= angle up &left
weight= down

Front

a 2 kg block slides down a 30 degree incline as shown above with an acceleration of 2 meters per second squared. which of the following diagrams best represents the gravitational force W, the frictional force f, and the normal force N that act on the block?

Back

375 N

Front

a horizontal, uniform board of weight 125N and length 4m is supported by vertical chains at each end. a person weighing 500 N is sitting on the board. the tension in the right chain is 250N. what is the tension in the left chain?

Back

1.6 m/s*s

Front

a rock with a mass of 25kg has a weight of 40.8 N on the moon. what is the value of the acceleration of gravity (g) on the moon?