Download 8th grade Energy, Force and Motion Quiz 4 (M) Newton`s Laws of

8th grade Energy, Force and Motion Quiz 4 (M)
Newton’s Laws of Motion
Name:
Date:
Each student should be able to….
8.6 (C) describe applications of Newton’s 3 Laws of Motion
Vocabulary Matching
Word Bank:
inertia
force
acceleration
reaction
1.________________ This is always equal and opposite to the action force
2. ________________ An object’s tendency to stay at rest or resist a change in motion
3. ______ Any change in a object’s speed or direction
4. ______ A push or a pull that changes an object’s motion
Identification
Word Bank: reaction
force
action
mass
at rest
inertia
1. For every _____________________ there is an equal and opposite reaction.
2. Newton’s first law is also called the Law of __________________ because it says that objects
resist changes in their motion.
3. A rocket with less _________ will have a greater acceleration during launch.
4.You need more __________ to accelerate when you have a larger mass.
Multiple Choice
1. Newton’s first law of motion, applied to a book sitting on a table, would explain
that the book will not move until which of the following conditions is met?
a. Gravity on the book can be reduced to zero
b. Unbalanced forces act on the book
c. balanced forces act on the book
d. friction is exerted on the book
2. The masses of four objects are given in this table. If all of the objects have the
same acceleration, which will require the greatest force?
a. Object 1
b. Object 2
c. Object 3
3. According to Newton’s Third Law, if someone jumps off a skateboard, the
skateboard will roll backwards because __
a. The mass of the skateboard is the same as the mass of the person jumping off.
b. The pull of gravity on the person is the same as on the skateboard.
c. For the force that sent the person forward, there is an equal force pushing back on the
skateboard.
4. An object is moving to the right with a force of 20 N. What will happen if a force of
20 N starts acting on it in the opposite direction?
a. The object’s velocity will increase.
b. The object’s velocity will decrease.
c. The object object will come to a stop.
5. Safety belts protect people in cars in the event of an accident. Because of Newton’s
Laws of Motion, when an impact causes the car to suddenly change its motion, if
the people are not wearing a seat belt a. The people in the car will continue to move in the same direction and at the same
speed as before the impact.
b. The people in the car will move backwards.
c. The people in the car will come to a stop.
6. What amount of force needs to be applied to a 20 kg bowling ball to give it an
acceleration of 5 m/s2? (Force = mass x acceleration)
a. 4 Newtons
b. 100 Newtons
c. 25 Newtons