Introduction To Physical Science

Chapter 11: Force and Newton's Laws

Force and Newton’s Laws

1
__________ is a force that resists motion between two surfaces that are in contact.
A)Friction
B)Resistance
C)Acceleration
D)Inertia
2
When unbalanced forces act on an object, __________.
A)the object accelerates
B)the object speeds up
C)friction becomes greater than the net force
D)the net force is zero
3
Newton's first law of motion states that __________.
A)when a force is applied on an object, there is an equal force applied by the object in the opposite direction
B)an object will remain at rest or keep moving with a constant velocity unless a force acts on it
C)when a force acts on an object, its acceleration is in the same direction as the force
D)acceleration is calculated by dividing the force exerted on an object by the mass of the object
4
What causes a falling skydiver to slow down after the parachute opens?
A)gravity
B)inertia
C)reference motion
D)air resistance
5
Forces that cancel each other are called __________ forces.
A)null
B)balanced
C)inactivated
D)neutral
6
A __________ is a push or a pull.
A)motion
B)acceleration
C)force
D)velocity
7
Newton's third law of motion states that __________.
A)when a force is applied on an object, there is an equal force applied by the object in the opposite direction
B)acceleration is calculated by dividing the force exerted on an object by the mass of the object, and that when a force acts on an object, its acceleration is in the same direction as the force
C)an object will remain at rest or keep moving in a straight line with constant speed unless a force acts on it
D)the force on an object can be found by dividing its mass by its acceleration
8
In describing the acceleration given a 2-kg object by a 10-N force acting on it, which of these units is appropriate?
A)N
B)kg/s2
C)N/kg2
D)m/s2
9
The strength of the gravitational force between two objects depends on which of the following?
A)the mass of the larger object
B)the orbits of the objects
C)the velocities of the objects
D)the mass of the objects and the distance between them
10
Friction always acts __________ the direction of motion of an object.
A)opposite to
B)perpendicular to
C)in the same direction as
D)at a 45° angle to
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