Download Newtons laws review 1

Newtons laws review 1
1. A bat applies an average force of 500 Newtons on a baseball for
0.20 second. What was the average force applied by the ball on
the bat?
A) 100 N
C) 500 N
B) 200 N
D) 1,000 N
9. A different force is applied to each of four 1-kilogram blocks to
slide them across a uniform steel surface at constant speed as
shown below. In which diagram is the coefficient of friction
between the block and steel smallest?
A)
2. Two forces are applied to a 2.0-kilogram block on a frictionless
horizontal surface, as shown in the diagram below.
B)
C)
The acceleration of the block is
A) 5.0 m/s2 to the right
C) 3.0 m/s2 to the right
B) 5.0 m/s2 to the left
D) 3.0 m/s2 to the left
3. A 50.-Newton horizontal force is needed to keep an object
weighing 500. Newtons moving at a constant velocity of 2.0
meters per second across a horizontal surface. The magnitude of
the frictional force acting on the object is
A) 500. N B) 450. N
C) 50. N
D) 0 N
D)
10. Two carts are pushed apart by an expanding spring, as shown in
the diagram below.
Base your answers to questions 4 and 5 on the diagram below
which represents a 3.0-kilogram mass being moved at a constant
speed by a force of 6.0 Newtons.
If the average force on the 1-kilogram cart is 1 newton, what is
the average force on the 2-kilogram cart?
A) 1 N
4. If the surface were frictionless, the 6.0-newton force would
produce an acceleration of
B) 2 m/s2
D) 18 m/s2
A) 0.33 m/s2
C) 6 m/s2
5. The magnitude of the force of friction acting on the mass is
A) 0 N
B) 1.8 N
C) 3 N
D) 6 N
B) 0.0 N
C) 0.5 N
D) 4 N
11. An elevator containing a man weighing 800 Newtons is rising at
a constant speed. The force exerted by the man on the floor of
the elevator is
A) less than 80 N
C) 800 N
B) between 80 and 800 N
D) more than 800 N
12. In the graph below, the acceleration of an object is plotted
against the unbalanced force on the object.
6. An unbalanced force of 10 Newtons acts on a 20-kilogram mass
for 5 seconds. The acceleration of the mass is
A) 0.5 m/s2
C) 40 m/s2
B) 2 m/s2
D) 200 m/s2
7. According to your reference table, Approximate Coefficents of
Friction, what is the minimum horizontal force needed to start a
300. N steel block on a steel table in motion?
A) 0.57 N B) 074 N
C) 171 N
D) 222 N
8. A student pulls a 60.-newton sled with a force having a
magnitude of 20. newtons. What is the magnitude of the force
that the sled exerts on the student?
A) 20. N
B) 40. N
C) 60. N
D) 80. N
What is the object's mass?
A) 1 kg
B) 2 kg
C) 0.5 kg
D) 0.2 kg
13. A man weighing 800 Newtons is standing in an elevator. If the
elevator rises with an acceleration of 9.8 meters per second2, the
force exerted by the elevator on the man will be
A) 400 N
B) 800 N
C) 1600 N D) 2000 N
Newtons laws review 1
14. Sand is often placed on an icy road because the sand
A) decreases the coefficient of friction between the tires of a
car and the road
B) increases the coefficient of friction between the tires of a car
and the road
C) decreases the gravitational force on a car
D) increases the normal force of a car on the road
15. A mosquito flying over a highway strikes the windshield of a
moving truck. Compared to the magnitude of the force of the
truck on the mosquito during the collision, the magnitude of the
force of the mosquito on the truck is
A) smaller
C) the same
B) larger
16. An object with a mass of 0.5 kilogram starts from rest and
achieves a maximum speed of 20 meters per second in 0.01
second. What average unbalanced force accelerates this object?
A) 1,000 N
C) 0.1 N
23. A wooden block is at rest on a horizontal steel surface. If a
10.-Newton force applied parallel to the surface is required to
set the block in motion, how much force is required to keep the
block moving at constant velocity?
A) less than 10. N
C) 10. N
B) greater than 10. N
24. A net force of 5.0 × 102 Newtons causes an object to accelerate
at a rate of 5.0 meters per second2. What is the mass of the
object?
A) 1.0 × 102 kg
C) 6.0 × 102 kg
B) 2.0 × 10–1 kg
D) 2.5 × 103 kg
25. The diagram below shows a horizontal 12-newton force being
applied to two blocks, A and B, initially at rest on a horizontal,
frictionless surface. Block A has a mass of 1.0 kilogram and
block B has a mass of 2.0 kilograms.
B) 10 N
D) 0.001 N
17. When a 12-newton horizontal force is applied to a box on a
horizontal tabletop, the box remains at rest. The force of static
friction acting on the box is
A) 0 N
C) 12 N
B) between 0 N and 12 N
D) greater than 12 N
18. Jill is pulling a 200. Newton sled through the snow at constant
velocity using a horizontal force of 10. Newtons. What is the
kinetic coefficient of friction of the sled on the snow?
A) 0.02
B) 0.05
C) 0.20
D) 20
19. A 25-newton horizontal force northward and a 35-newton
horizontal force southward act concurrently on a 15-kilogram
object on a frictionless surface. What is the magnitude of the
object’s acceleration?
A) 0.67 m/s2
C) 2.3 rn/s2
B) 1.7 m/s2
D) 4.0 m/s2
20. A 1.0 x 102-kilogram box rests on the bed of a truck that is
accelerating at 2.0 meters per second2. What is the magnitude of
the force of friction on the box as it moves with the truck
without slipping?
A) 1.0 x 103 N
C) 5.0 x 102 N
B) 2.0 x 102 N
D) 0.0 N
21. A student is standing in an elevator that is accelerating
downward. The force that the student exerts on the floor of the
elevator must be
A)
B)
C)
D)
less than the weight of the student when at rest
greater than the weight of the student when at rest
less than the force of the floor on the student
greater than the force of the floor on the student
22. An object accelerates at 2.5 meters per second2 when an
unbalanced force of 10. Newtons acts on it. What is the mass of
the object?
A) 1.0 kg
B) 2.0 kg
C) 3.0 kg
D) 4.0 kg
The magnitude of the acceleration of block B is
A) 6.0 m/s2
C) 3.0 m/s2
B) 2.0 m/s2
D) 4.0 m/s2
Answer Key
Newtons laws review 1
1.
C
2.
C
3.
C
4.
B
5.
D
6.
A
7.
D
8.
A
9.
B
10.
A
11.
C
12.
C
13.
C
14.
B
15.
C
16.
A
17.
C
18.
B
19.
A
20.
B
21.
A
22.
D
23.
A
24.
A
25.
D