Concepts
Concepts
Formula
Formula
100
An object that experiences a push or a pull has a(n) ____ exerted on it.
force
100
Moving faster as you pedal your bicycle harder on a level road demonstrates Newton’s ____ law.
second
100
What force is required to accelerate a 10.0 kg bowling ball at 3.0 m/s2 forward?
F = ma = (10.0 kg)(3.0 m/s2 forward) =
30 N forward
100
A rocket weighs 2.0 × 10^7 N. Its engines exert an upward force of 25 × 10^6 N at liftoff.
What is the mass of the rocket at liftoff?
m = 
200
Forces have both direction and ____ .
magnitude
200
According to Newton’s ____ law, an object with no net force acting on it remains at rest or in motion with a constant velocity.
1st
200
What is the mass of a cat that weighs 90.0 N?
m =
200
A rocket weighs 2.0 × 10^7 N. Its engines exert an upward force of 25 × 10^6 N at liftoff. What is the rocket’s acceleration when it lifts off?
b. a = 
=
=
300
An object with no net force acting on it is in ____ .
equilibrium
300
If you push against a wall, the wall pushes back against you with ____ force.
equal
300
How large is the tension in a rope that is supporting a 9.2-kg bucket?
FT = Fg and Fg = mg
Therefore,
FT = mg = (9.2 kg)(9.8 N/kg) = 90.16 N
300
A 47-N box is pulled along a frictionless horizontal surface by a 25-N weight hanging from a cord on a frictionless pulley.
How large are the box’s acceleration and mass?
m1 = 
m2 = 
a = 
400
An object’s weight depends upon the ____ and the object’s mass.
gravitational field
400
An object is in equilibrium if ____ .
the net force on it is zero
400
A net force of 165 N upward acts on an object. Find the single force that will produce equilibrium.
A force of 165 N downward will produce equilibrium.
400
A 47-N box is pulled along a frictionless horizontal surface by a 25-N weight hanging from a cord on a frictionless pulley.
How large is the force exerted on the cord?
Fcord = m2a = (2.6 kg)(3.4 m/s2) = 8.8 N
500
According to Newton’s third law, the two forces that make up an interaction pair are equal in ____ but ____ in direction.
magnitude, opposite
500
The force exerted by any segment of a string or rope on an adjoining segment is ____ .
tension
500
An elevator with a mass of 1.10 × 10^3 kg accelerates upward at 0.45 m/s2. What is the force acting on the elevator’s support cable?
FT = Fnet + Fg
= ma + mg = m(a + g)
= (1.10 × 10^3 kg)(0.45 m/s2 + 9.8 N/kg)
= 1.1 × 10^4 N
500
A stepping stool is constructed so that it collapses when the normal force exceeds 1100 N. You are assisting a welder who weighs 106 kg and is on the top step of the stepping stool. You pass the welder a torch and a fuel tank that weigh a combined 14 kg. The welder refuses to take both items from you. Explain why. Show your calculations.
Fwelder = mg = (106 kg)(9.8 N/kg)
= 1.00 × 103 N
Ftotal = (mwelder + mequipment)g
= (106 kg + 14 kg)(9.8 N/kg) = 1100 N
Adding the torch and fuel tank to the weight of the welder would exceed the 1100 N specified for this stool.