Neglecting friction, a large block of ice and a small block of ice start sliding down an inclined plane together. The heavier block will get to the bottom _____.

at the same time as the light block

melted and same size as the light block

The frictional force between two surfaces in contact does not depend on _____________.

the normal force pressing one against the other

if the surfaces are stationary or in relative motion

whether or not a lubricant is used

Physics Online Quiz On Dynamics

Reviewed by Rajendra Khanal

Rajendra Khanal, PhD (Physics) |

Assistant Professor of Physics

Review Board Member

Rajendra Khanal, PhD in Applied Physics from The University of Toledo, is an Assistant Professor at the University of Pittsburgh with over 20 years of teaching experience. He also holds an MSHIM degree in Health Information Management from the University of Pittsburgh.

, PhD (Physics)

By Sir_july

Sir_july

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1/15 Questions

Study the motion of the body in each case: a. a ship moving at 10 km/h in a straight path. b. a car moving on a straight path and then slowing down to stop c. a storm initially moving at 50 km/h northeast and then 60 km/h eastward d. a bus moving at 40 km/h around a curve. Which bodies move with constant speed?
- C and d only
- A and d only
- B and c only
- A, b and c

About This Quiz

This quiz covers topics related to motion, specifically speed/velocity, acceleration, uniform motion, uniformly accelerated linear motion, and forces/friction. Expect questions that prompt you to apply theoretical concepts to practical situations, fostering a holistic understanding of physics in action. With each question, you'll have the chance to refine your problem-solving skills and gain insights into the underlying principles governing motion See morein our universe.
In this quiz, you'll encounter a variety of questions ranging from Newton's laws of motion to concepts of energy and momentum. Test your ability to analyze and interpret dynamic scenarios, from simple linear motion to complex systems of interacting objects. Whether you're a physics enthusiast or a student looking to enhance your comprehension, this quiz offers a stimulating opportunity to engage with the fundamentals of dynamics.

2.

Study the motion of the body in each case: a. a ship moving at 10 km/h in a straight path. b. a car moving on a straight path and then slowing down to stop c. a storm initially moving at 50 km/h northeast and then 60 km/h eastward d. a bus moving at 40 km/h around a curve. Which body moves with constant velocity?
- A only
- B only
- C only
- D only
Correct Answer

A. A only

Explanation

A ship moving at 10 km/h in a straight path will have a constant velocity because both the speed and direction remain unchanged. Velocity is defined as the rate of change of displacement, and since the ship is moving in a straight line at a constant speed, there is no change in displacement over time. Therefore, the ship is moving with constant velocity.

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8
3.

Study the motion of the body in each case: a. a ship moving at 10 km/h in a straight path. b. a car moving on a straight path and then slowing down to stop c. a storm initially moving at 50 km/h northeast and then 60 km/h eastward d. a bus moving at 40 km/h around a curve. Which bodies are accelerating?
- A and b only
- B and c only
- C and d only
- B, c and d only
Correct Answer

A. B, c and d only

Explanation

In physics, acceleration is defined as the rate of change of velocity. Velocity is a vector quantity that includes both magnitude and direction. In case a, the ship is moving at a constant speed in a straight path, so there is no change in velocity and therefore no acceleration. However, in case b, the car is initially moving at a certain speed and then slows down to stop, indicating a change in velocity and hence acceleration. In case c, the storm initially moves northeast and then changes its direction to move eastward, indicating a change in velocity and acceleration. In case d, the bus is moving at a constant speed but around a curve, which means it is changing its direction and hence experiencing acceleration. Therefore, the bodies that are accelerating are b, c, and d only.

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5
4.

A car travels at a constant speed of 20 m/s. After 4 sec, its speed is ____.
- 10 m/s
- 20 m/s
- 60 m/s
- 80 m/s
Correct Answer

A. 20 m/s

Explanation

Since the car is traveling at a constant speed of 20 m/s, its speed remains the same after 4 seconds. Therefore, the correct answer is 20 m/s.

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7
5.

Two boys are pushing a jeep, with a force of 20 N each. The jeep does not move. The force of friction between the tires and the road is ________.
- Less than 40 N
- Greater than 40 N
- Equal to 20 N
- Equal to 40 N
Correct Answer

A. Greater than 40 N

Explanation

If the jeep does not move despite the combined force of 40 N exerted by the two boys, it implies that the force of friction between the tires and the road is greater than 40 N. Friction opposes the motion, and if the applied force cannot overcome the frictional force, the object will remain stationary. Thus, the frictional force in this case must exceed the applied force of 40 N.

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5
6.

As an object freely falls, its _________.
- Velocity remains constant
- Velocity increases
- Velocity decreases
- Acceleration increases
Correct Answer

A. Velocity increases

Explanation

As an object freely falls, its velocity increases. This is because the object is accelerating due to the force of gravity. As it falls, the force of gravity pulls it downwards, causing it to gain speed and its velocity to increase.

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6
7.

While a car travels around a circular track at constant speed, its ________.
- Acceleration is zero
- Speed is zero
- Both a and b
- Neither a nor b
Correct Answer

A. Neither a nor b

Explanation

While a car travels around a circular track at a constant speed, its acceleration is not zero because it is constantly changing direction, which requires centripetal acceleration. Additionally, its speed is also not zero because it is moving along the track at a constant speed. Therefore, the correct answer is neither a nor b.

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5
8.

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is ________.
- More than 10 N
- Less than 10 N
- 0 N
- 10N
Correct Answer

A. 10N

Explanation

The force of friction on a sliding object is equal to the applied force needed to maintain a constant velocity. In this case, the force of friction is 10 N, so the applied force needed to maintain a constant velocity is also 10 N.

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4
9.

Neglecting friction, a large block of ice and a small block of ice start sliding down an inclined plane together. The heavier block will get to the bottom _____.
- Before the light block
- After the light block
- At the same time as the light block
- Melted and same size as the light block
Correct Answer

A. At the same time as the light block

Explanation

The correct answer is "at the same time as the light block". This is because neglecting friction means that both blocks will experience the same acceleration down the inclined plane. Since they start sliding together, they will continue to maintain the same relative positions throughout the motion. Therefore, they will reach the bottom of the inclined plane at the same time.

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8
10.

A block is dragged without acceleration in a straight-line path across a level floor surface by a force of 6 N. What force of friction between the block and the surface?
- Less than 6 N
- Greater than 6 N
- 6 N
- 0 N
Correct Answer

A. 6 N

Explanation

The force of friction between the block and the surface is 6 N. This is because if the block is being dragged without acceleration, it means that the force of friction is equal in magnitude and opposite in direction to the applied force of 6 N. Therefore, the force of friction must also be 6 N.

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4
11.

The frictional force between two surfaces in contact does not depend on _____________.
- The normal force pressing one against the other
- The areas of the surfaces
- If the surfaces are stationary or in relative motion
- Whether or not a lubricant is used
Correct Answer

A. The areas of the surfaces

Explanation

The frictional force between two surfaces in contact does not depend on the areas of the surfaces. Friction is determined by the normal force pressing one surface against the other, whether the surfaces are stationary or in relative motion, and whether or not a lubricant is used. The size or shape of the surfaces does not affect the frictional force.

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6
12.

How many forces are acting on box m in diagram (a) below? *Friction is present in all surfaces.
- 3
- 4
- 5
- 6
Correct Answer

A. 4

Explanation

In the given diagram (a), there are four forces acting on box m. These forces include the gravitational force pulling the box downwards, the normal force exerted by the surface on the box in the upward direction, the frictional force opposing the motion of the box, and the applied force pushing the box in a certain direction.

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7
13.

How many forces are acting on box M in diagram (a)? *Friction is present in all surfaces.
- 3
- 4
- 5
- 6
Correct Answer

A. 4

Explanation

In diagram (a), there are four forces acting on box M. The weight of the box is acting downwards due to gravity. The normal force is acting upwards perpendicular to the surface the box is resting on. The friction force is acting in the opposite direction to the motion or potential motion of the box. Finally, there is a force being applied to the box, which could be from pushing or pulling it. Therefore, there are four forces acting on box M in diagram (a).

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3
14.

How many forces are acting on the two boxes in diagram (a)? *Friction is present in all surfaces.
- 6
- 7
- 8
- 9
Correct Answer

A. 8

Explanation

In the given diagram (a), there are two boxes. Each box is in contact with the ground, so there is a normal force acting on each box due to the weight of the box. Additionally, there is a frictional force acting on each box due to the presence of friction on all surfaces. Therefore, for each box, there are two forces acting vertically (normal force and weight) and two forces acting horizontally (frictional force and weight). Since there are two boxes, the total number of forces acting on the two boxes is 8.

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11
15.

How many forces are acting on the two boxes in diagram (b)? *Friction is present in all surfaces.
- 8
- 9
- 10
- 11
Correct Answer

A. 10

Explanation

In diagram (b), there are two boxes in contact with each other. Each box experiences its weight force acting downwards and an equal and opposite normal force acting upwards from the surface it is resting on. Additionally, there is a friction force acting between the two boxes in the opposite direction of their relative motion. Therefore, there are a total of 10 forces acting on the two boxes in diagram (b).

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8

Rajendra Khanal |PhD (Physics) |

Assistant Professor of Physics

Quiz Review Timeline (Updated): Mar 29, 2024 +

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Current Version
Mar 29, 2024

Quiz Edited by
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Expert Reviewed by
Rajendra Khanal
Jul 29, 2009

Quiz Created by
Sir_july

Physics Online Quiz On Dynamics

Quiz Preview

A car travels at a constant speed of 20 m/s. After 4 sec, its speed is ____.

Two boys are pushing a jeep, with a force of 20 N each. The jeep does not move. The force of friction between the tires and the road is ________.

As an object freely falls, its _________.

While a car travels around a circular track at constant speed, its ________.

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is ________.

Neglecting friction, a large block of ice and a small block of ice start sliding down an inclined plane together. The heavier block will get to the bottom _____.

A block is dragged without acceleration in a straight-line path across a level floor surface by a force of 6 N. What force of friction between the block and the surface?

The frictional force between two surfaces in contact does not depend on _____________.

How many forces are acting on box m in diagram (a) below? *Friction is present in all surfaces.

How many forces are acting on box M in diagram (a)? *Friction is present in all surfaces.

How many forces are acting on the two boxes in diagram (a)? *Friction is present in all surfaces.

How many forces are acting on the two boxes in diagram (b)? *Friction is present in all surfaces.