Indiana Science Grade 7

Chapter 12: Force and Newton’s Laws

Force and Newton’s Laws

1.
When unbalanced forces act on an object, __________.
A)the object speeds up
B)the object accelerates
C)the net force is zero
D)friction becomes greater than the net force
2.
What causes a falling skydiver to slow down after the parachute opens?
A)gravity
B)inertia
C)air resistance
D)reference motion
3.
__________ measures an object's tendency to resist changing its motion.
A)Gravity
B)Inertia
C)Acceleration
D)Mass
4.
Gravity causes all objects near Earth's surface to fall with an acceleration of __________.
A)a = F X m
B)98 m2/s
C)9.8 m/s2
D)9.8 m/s
5.
__________ measures the quantity of matter of an object.
A)Net force
B)Mass
C)Weight
D)Density
6.
Which of the following statements is true?
A)An object does not accelerate if it turns and maintains constant speed.
B)When speed increases gradually, average speed and instantaneous speed are the same.
C)If a moving object slows down, it is accelerating.
D)Velocity of a moving object is the distance traveled divided by the time needed to travel the distance.
7.
Friction always acts __________ the direction of motion of an object.
A)perpendicular to
B)opposite to
C)at a 45° angle to
D)in the same direction as
8.
Newton's first law of motion states that __________.
A)acceleration is calculated by dividing the force exerted on an object by the mass of the object
B)an object will remain at rest or keep moving with a constant velocity unless a force acts on it
C)when a force is applied on an object, there is an equal force applied by the object in the opposite direction
D)when a force acts on an object, its acceleration is in the same direction as the force
9.
__________ is a force that resists motion between two surfaces that are in contact.
A)Inertia
B)Friction
C)Acceleration
D)Resistance
10.
Which of the following statements is true?
A)Weight is the measure of the amount of matter in an object.
B)Weight is a measure of inertia.
C)Mass is a force.
D)Weight can change when acceleration due to gravity changes.
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