Forces and Motion Day 4

Multiple Choice

You push a box 35 N to the right. Your friend pushes the box 25 N in the same direction. What is the net force?

• 60 N balanced to the right

• 60 N unbalanced to the right

• 10 N balanced to the right

• 10 N unbalanced to the right

Multiple Choice

What is the net force of this object?

• 400 F arrow downward

• 400 F arrow upward

• 800 F arrow upward

• 800 F arrow downward

Multiple Choice

Which of the following objects will experience an unbalanced force?

• A bike rider on a smooth and level road, pedaling at a constant rate

• A chair sitting on the floor with balanced forces acting in opposite directions

• A train pulling another train, each with the same amount of force

• A ball rolling across the floor with friction acting in the opposite direction

Multiple Choice

At A the speed of the ball increases. At B, speed decreases. At C, speed is constant. Which points does the ball experience unbalanced forces?

• A and B

• A and C

• B and C

• A, B, and C

Multiple Choice

A girl is pushing a cart by herself with a force of 7 N. What will happen if a boy begins to help her and their combined force is 17 N?

• The cart will speed up.
• The cart will slow down.
• The cart will move at a constant speed in a straight line.
• The cart will fly to never never land!

Multiple Choice

A mother and daughter press their hands together and then push apart while ice skating. Immediately after they push away from each other, how does the motion of the mother and daughter change?

• The mother moves forward, and the daughter moves backward with a greater acceleration

• Both move forward, but the mother moves with a greater acceleration

• The mother moves backward, and the daughter moves forward with a greater acceleration

• Both move backward, but the daughter moves with a greater acceleration

Multiple Choice

A student used a video camera to record another student dropping a marble through water in a graduated cylinder. The students watched the video in slow motion and made the observations shown. During which part or parts of the marble's fall did the marble experience unbalanced forces?

• Part 1 only

• Parts 1 and 2 only

• Part 3 only

• Parts 2 and 3 only

Multiple Choice

The diagram below shows a sled moving along a smooth, frictionless track. In which sections of the track will the sled experience a unbalanced force?

• Sections 1 and 3

• Sections 2 and 3

• Sections 2 and 4

• Sections 3 and 4

Multiple Choice

If a 10 kilogram object accelerates suddenly at 15 m/s^2, how much force was applied to the object?

• 150 Newtons
• 15 Newtons
• 150 kilograms
• 100 kilograms

Multiple Choice

If a force of 50 Newton's was applied to an object with a mass of 500 grams, what will the object's acceleration be?

• 10 m/s^2
• .1 m/s^2
• 100 m/s^2
• 1 m/s^2

Multiple Choice

45 m/s² is the... 

• Mass
• Force 
• Acceleration
• weight

Multiple Choice

If a force of 26 N is exerted on two balls, one with a mass of 0.52 kg and the other with a mass of 0.78 kg, which ball will have the greater acceleration?  (F=ma)

• The one with a mass of .78 kg will have the greatest acceleration.
• The one with a mass of .52 kg will have the greatest acceleration.
• They will both accelerate at the same rate.

Multiple Choice

A 20 kg bike accelerates at 10 m/s².  what was the force?

• 25 Newtons
• 20 Newtons
• 200 Newtons
• 10 Newtons

Multiple Choice

The mass of a car is 1000 kg.  How much force would be required to accelerate the car at a rate of 3 m/s²? 

• 1000 ÷ 3
• 3 ÷ 1000
• 1000 x 3

Multiple Choice

The diagrams show forces acting on a toy car as it moves to the right. Which diagram shows the toy car that will likely accelerate to the right based on these conditions?

Multiple Choice

Two students are working together to build a birdhouse. Student 1 applies a force of 10N to a wooden board in order to slide it across the table to Student 2. If the force of friction resisting the student's push is 4N, what is the net force acting on the board?

• 4N

• 6N

• 10N

• 14N

Multiple Choice

Which answer choice correctly describes the ball's kinetic and potential energy?

• The ball has more potential energy at position X than at position Z.

• The ball has more kinetic energy at position Y than at position W.

• The potential energy and kinetic energy of the ball are equal at position X.

• The potential energy and kinetic energy of the ball are greatest at position Z.

Multiple Choice

Energy due to motion is ____________ energy. 

• Potential 
• Energy
• Kinetic
• Friction

Multiple Choice

__________ is stored energy. 

• Potential
• Kinetic
• None of the above 
• All of the above 

Multiple Choice

At which point is potential energy greatest?

• W
• X
• Y
• Z

Multiple Choice

At which point is kinetic energy greatest? 

• W
• X
• Y
• Z

Multiple Choice

When a pendulum swings, at which point is kinetic energy highest?

• 1
• 2
• 3
• 4

Multiple Choice

When a pendulum swings, at which point is potential energy at its greatest?

• 1
• 2
• 3
• 4

Multiple Choice

Which point has the most potential energy?

• G
• f
• b
• a

Multiple Choice

Explain what happens to the potential energy of a rock as it falls off the side of a cliff.

• The kinetic energy decreases as the potential energy increases.
• The kinetic energy decreases as the potential energy decreases.
• The potential energy decreases as the kinetic energy increases.
• The potential energy decreases as the kinetic energy decreases.