 Laws of Motion and Gravity
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Practice 29 QuestionsShow answers
• Question 1
30 seconds Q. An eraser rubbing across a sheet of paper is an example of which type of friction?
static
sliding
rolling
fluid
• Question 2
30 seconds Q. Two students pull on the opposite ends of a rope, but neither student is able to move the other. Which statement best explains why neither student is moved?
The each pull on the rope with the same amount of force, so the net force is zero.
They each exert the same amount of friction against the ground, so the net friction is zero.
Their forces are not balanced, but gravity keeps them from moving
The two students have the same mass.
• Question 3
30 seconds Q. A horizontal force of 24 N is being applied to a box on a level surface. The box is accelerating at the rate of 2.0 m/s2 against a frictional force of 14 N. What is the mass of the box?
5.0 kg
7.0 kg
12.0 kg
19 kg
• Question 4
30 seconds
Q. A student pushes a book with a force of 5 N to the east. Which statement describes the reaction force?
5N eastward, acting on the book
5N westward, acting on the book
5N eastward, acting on the student
5N westward, acting on the student
• Question 5
120 seconds
Q. A 3.0 N force and a 5.0 N force are acting in opposite directions on the same 5.0 kg ball. What is the magnitude of the acceleration of the ball?
0.40 m/s2
0.63 m/s2
1.6 m/s2
2.5 m/s2
• Question 6
45 seconds Q. Student X pushes a 10 N box with a force of 2 N towards Student Y. At the same time, Student Y pushes the same box with a 6 N force in the opposite direction. Which would most likely occur?
The resultant force on the box would be 8 N.
The resultant force on the box would be 18 N.
The box will move toward Student X.
The box will move toward Student Y.
• Question 7
30 seconds
Q. The force acting on an object is decreased to half its initial value after the mass of the object is doubled. Which statement best describes the resulting change in acceleration of the object?
The acceleration is decreased to one-fourth of its initial magnitude
The acceleration is decreased to one-half of its initial magnitude.
The acceleration is increased to twice its initial magnitude.
The acceleration is increased to four times its initial magnitude.
• Question 8
30 seconds Q. The action of swimmers using their arms to generate action and reaction forces which propel themselves through the water is an example of what law?
Newton’s First Law of Motion
Newton’s Third Law of Motion
Law of Conservation of Linear Momentum
Law of Conservation of Angular Momentum
• Question 9
30 seconds Q. When a hammer strikes a nail, the nail
exerts balanced forces that helps it from moving.
exerts a force equal to the weight of the hammer.
exerts an unbalanced force that changes its velocity.
exerts an equal and opposite force back on the hammer.
• Question 10
30 seconds
Q. Which object will have the greatest acceleration if acted upon by a net force of 100 N?
5-kg object
25-kg object
50-kg object
100-kg object
• Question 11
30 seconds Q. The property of matter that resists changes in motion is called
inertia.
friction.
gravity.
weight.
• Question 12
30 seconds Q. Brakes on a car are designed to use friction to slow or stop a vehicle. Brake shoes and pads are lined with a heat-resistant material that presses against rotating disks or drums. Which type of frictional force causes a car to decelerate when the brakes are applied?
Fluid
Rolling
Sliding
Static
• Question 13
30 seconds Q. A hockey stick applies a force to a puck that results in an acceleration of 3.0 m/s2. What would be the effect on the acceleration on the hockey puck if the force is tripled?
The acceleration would remain the same.
The acceleration would be reduced to 1.0 m/s2.
The acceleration would be increased to 6.0 m/s2.
The acceleration would be increased to 9.0 m/s2.
• Question 14
30 seconds Q.  What is the net force on the box?
7 N up
8 N up
8 N down
22 N down
• Question 15
30 seconds Q. Which of the following is an example of balanced forces?
A
B
C
D
• Question 16
30 seconds Q. A sailboat accelerates at a rate of 2 m/s2 and has a mass of 800 kg. What is the net force acting on the sailboat?
400 N
800 N
1200 N
1600 N
• Question 17
30 seconds
Q. The name that we give to the force that opposes motion is
acceleration
friction
gravity
mass
• Question 18
30 seconds
Q. Which of the following would not change the amount of friction present between the surface of an object and the ground?
changing the texture of the surface
painting the object a different color
adding more mass to the object
• Question 19
30 seconds Q. You are pushing on a box with 700 N of force. The force of friction is 50 N. What is the net force on the box?
600 N
650 N
700 N
750 N
• Question 20
30 seconds
Q. A student pushes on a crate with 100 N of force directed to the right. What force does the crate exert on the student?
100 N to the right
100 N to the left
. 980 N to the right
980 N to the left
• Question 21
30 seconds
Q. Which has more inertia?
1000 kg car moving 1 m/s
70 kg person sprinting at 8 m/s
2500 kg elephant sitting by the pond
300 kg boulder rolling at 3 m/s
• Question 22
30 seconds
Q. Which has more momentum?
1000 kg car moving 1 m/s
70 kg person sprinting at 8 m/s
2500 kg elephant sitting by the pond
300 kg boulder rolling at 3 m/s
• Question 23
120 seconds
Q. On Earth, the Mars rover had a weight (force due to gravity) of 9800 N. What will be its weight (force due to gravity) on Mars where the acceleration due to gravity is 4 m/s2?
1000 N
2000 N
3000 N
4000 N
• Question 24
30 seconds Q. Why does the weight of an object change with increasing elevation on Earth?
The mass of the object decreases with higher elevation.
The force of gravity acting on the object increases with higher elevation.
The force of gravity acting on the object decreases with higher elevation.
The mass of the object increases with higher elevation
• Question 25
30 seconds Q. A Mars rover has been sent to explore and relay data from Mars. Mars is less massive than Earth. When compared to the Earth, which is the best comparison between the mass and the weight of the Rover on Mars?
The mass is more on Mars and the weight is less.
The weight is less on Mars and the mass is less.
The weight is less on Mars and the mass is the same.
The mass is less on Mars and the weight is the same.
• Question 26
30 seconds Q. A ball is dropped and hits the ground in 1.5 s with a final speed of 15 m/s. How would the acceleration and final speed of the ball be affected if it were dropped from a greater height on Earth.
Its final speed would remain the same because its rate of acceleration would remain the same.
Its final speed would increase because its rate of acceleration would remain the same.
Its final speed would remain the same because its rate of acceleration would decrease.
Its final speed would increase because its rate of acceleration would increase.
• Question 27
30 seconds
Q. An object of mass 30 kg is in free fall in a vacuum on Earth where there is no air resistance. What is the acceleration of the object?
9.8 m/s2
30 kg
294 N
not enough information given
• Question 28
30 seconds Q. A 50 kg skydiver reaches terminal velocity before opening her parachute. What is the force of air resistance? (Hint: W=mg)
0 N
9.8 N
490 N
980 N
• Question 29
30 seconds Q. With what force will a car hit a tree if the car has a mass of 3000 kg and it is accelerating at a rate of 2 m/s2