Brain Stem Hub

5 N downward

5000 N downward

5000 N upward

5N upward

1 N, 1.75 N

1.75 N, 1 N

1000 N, 1750 N

1750 N, 1000 N

1 N, 1.72 N

2N, 1.72 N

2N, 1N

1.72 N, 1.0 N

0.344 m/s^2

0.034 m/s^2

3.34 m/s^2

33.4 m/s^2

0.2 m/s2

9.8 m/s2

-0.2 m/s2

-9.8 m/s2

43 m/s, 25 m/s

50 m/s, 43.3 m/s

25m/s, 50 m/s

25m/s, 43.3 m/s

It is unaffected by gravity and remains constant throughout the motion.

It continuously increases due to the force of gravity

It decreases over time as the projectile slows down.

It is affected by air resistance in an idealized projectile motion

200 m

100 m

12.5 m

100 m/s

4.33 seconds

8.66 seconds

2.33 seconds

1.33 seconds

4.33 seconds

8.66 seconds

2.33 seconds

12 seconds

95 m

45 m

25 m

15 m

A force that pushes an object outward from the center of a circular path

A force that acts perpendicular to the direction of motion, pulling an object toward the center of a circular path

A force that acts in the same direction as the velocity of an object in circular motion

A force that is responsible for maintaining an object's straight-line motion

270 N

2700 N

27, 000 N

270,000 N

Static friction only exists if the object is moving

The pulling force decreases the coefficient of static friction

The pulling force is less than the maximum static friction force

The surface is perfectly smooth, so there is no friction:

The pulling force is greater than the kinetic friction force, causing constant speed

The pulling force equals the kinetic friction force

The kinetic friction force increases as the sled moves faster

The sled's weight decreases while being pulled, reducing friction

The initial force overcame static friction, but only a smaller force is needed to balance kinetic friction

The coefficient of kinetic friction decreases once the crate starts moving

The crate’s weight decreases when it is in motion.

Kinetic friction becomes zero once the crate moves

Static friction between the tires and road.

Kinetic friction acting between the tires and road

Rolling friction acting against the car's motion

Air resistance causing a reduction in speed

The force of gravity down the incline equals the kinetic friction force

The force of gravity down the incline is greater than the kinetic friction force.

The normal force is equal to the force of gravity.

The coefficient of kinetic friction is greater than 1.

The ice melts under the puck, causing it to stop

Static friction is acting against the puck’s motion

The kinetic friction force between the puck and ice opposes its motion

The puck’s weight decreases as it slides, increasing friction

1) Question : An object weighing 500g rests on a flat surface. What is the direction and magnitude of normal force acting on the object

2) Question : An object weighing 500g rests on a flat surface. What is the magnitude of the kinetic friction and static friction respectively, given the coefficient of kinetic friction is 0.2 kg/N and coefficient of static friction is 0.35 kg/N

3) Question : A person pulls an object at a direction of 30 degrees as shown below. What are the horizontal and vertical components of the force respectively. Given Pull force= 2N, sin30= 0.5 and cos 30= 0.86

4) Question : A person pulls an object at a direction of 30 degrees as shown below. What is the horizontal acceleration given mass of an object is 5 kg and assume there is no friction force.

5) Question : Answers for A person pulls an object at a direction of 30 degrees as shown below. What is the vertical acceleration given mass of an object is 5 kg and assume there is no friction force.

6) Question : A bomb is launched at a 60-degree angle with an initial velocity of 50m/s . What are the horizontal components and vertical components of the initial velocity

7) Question : What is special about the horizontal component of a projectile motion

8) Question : A bomb is launched at a 60-degree angle with an initial velocity of 50m/s . What distance does it cover after 4 seconds?

9) Question : A bomb is launched at a 60-degree angle with an initial velocity of 50m/s. What is the time required to reach the maximum height?

10) Question : A bomb is launched at a 60-degree angle with an initial velocity of 50m/s. What is the total time required to reach the ground again. This can be solved in two methods

11) Question : A bomb is launched at a 60-degree angle with an initial velocity of 50m/s. What is the maximum height that can be reached?

12) Question : What is a centripetal force

13) Question : A car is traveling along a circular path with a mass of 3000 kg and a speed of 30m/s at a radius of 10 m. Determine the angular acceleration and the centripetal force acting on the car.

14) Question : A person is forcefully pulling a heavy object to the right. However, despite exerting a high pulling force, the object did not move. What could explain this phenomenon?

15) Question : A person is pulling a sled across a flat, snowy surface. Despite continuously applying a pulling force, the sled moves at a constant speed. What could explain this phenomenon?

16) Question : A person pushes a heavy crate across a rough floor. As they push harder, the crate starts moving, and then they reduce their force slightly but maintain constant speed. What can explain this behavior?

17) Question : A car is driving at a constant speed on a road. If the engine stops providing power, the car eventually comes to a stop due to friction. What type of friction is primarily responsible?

18) Question : A block slides down an inclined plane at a constant speed. What can you conclude about the relationship between forces acting on the block

19) Question : A hockey puck slides across the ice and gradually slows down. What is the best explanation for why the puck slows down?