Weekly Review 3/14

A 5 kg box is being pushed to the right with a force of 50 N, while friction applies a force of 20 N to the left. Additionally, gravity exerts a force of 49 N downward, and the normal force from the surface is 49 N upward.

Which statement correctly describes the net force and the motion of the box?

• A) The net force is 30 N to the right, and the box will accelerate in that direction.

• B) The net force is 30 N to the left, and the box will accelerate in that direction.

• C) The forces are balanced in both directions, so the box will remain at rest.
  

• D) The forces are unbalanced in both directions, so the box will accelerate downward and to the right.

Which of the following best explains why a heavier object is harder to move than a lighter object?

A) The heavier object has more inertia, meaning it resists changes in its motion more than a lighter object.
B) The heavier object has less inertia, meaning it moves more easily than a lighter object.
C) The heavier object has more force acting on it, causing it to accelerate faster than a lighter object.
D) The lighter object has more inertia, making it harder to stop than a heavier object.

• A

• B

• C

• D

What does Newton's first law of motion say about an object at rest?

• It will disappear.

• It will change its shape.

• It will remain at rest unless a force acts on it.

• It will start moving on its own.

A 2 kg ball is dropped from a height. What is the force acting on the ball due to gravity? (Use the acceleration due to gravity, g = 9.8 m/s²) Remember. . . F=MA

A) 9.8 N
B) 19.6 N
C) 2 N
D) 0.2 N

• A

• B

• C

• D

What is the net force on an object in equilibrium?

• Equal to the object's speed.

• Zero, because all forces are balanced.

• Equal to the object's mass.

• Equal to the gravitational force.

How do we measure the force of gravity on an object?

• By its color.

• By its speed.

• By its temperature.

• By multiplying its mass by the acceleration due to gravity.

If the box is not moving, what is the net force

• O Newtons

• 100 Newtons

• 1 Newton

• 10 Newtons

What does Newton's third law of motion state?

• For every action, there is a larger reaction.

• For every action, there is an equal and opposite reaction.

• For every action, there is a smaller reaction.

• For every action, there is no reaction.

Cart A has 25N of applied force and 5N of frictional force. It's mass is 5kg. What is the acceleration of the cart.

• 6m/s^2

• 30m/s^2

• 4m/s^2

• 100m/s^2