Forces Unit Review

What is the net force on the box shown below?          

• a.  10 N to the left 
• b.10 N to the right
• c.  60 N to the left
• d.  50 N to the right

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When you slide a box across the floor what force must your push be stronger than?

• a. support force

• b. friction force

• c. gravity

• d. air resistance

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Why is it more difficult for the boy in image B to go down the hill?

• Motion

• Friction

• Work

• Displacement

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If these children are pulling with the same amount of force, what will happen?

• The child in blue will win.

• The children will not move.

• The child in red will win.

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What is the net force acting on the block?

• 5 Newtons up

• 5 Newtons down

• 15 Newtons up

• 15 Newtons down

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__________ is the sum of all forces acting on an object. It is capable of accelerating a mass. 

• velocity
• gravity
• net force
• distance

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What is Newtons 2nd law?

• equal&opposite force
• law inertia
• f=ma

Which of the following is an example of a non-contact force?

• gravity

• air resistance

• friction

• applied force

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A cup is forgotten on the roof of a car. When the car begins to move, the cup does not move forward with the car. Instead, it falls off the roof. Why?

• The cup accelerated backward as the car accelerated forward, so the cup fell off the car.

• An unbalanced force caused the cup to move with the car, but gravity caused it to fall.

• The upward force on the cup increased as the car moved forward, so the cup fell.

• Inertia kept the cup from moving while the car moved forward.

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What happens when two forces act in the same direction?

• The forces cancel out.

• The larger force prevails.

• The two forces add together.

• Their sum divided by the two forces equals the total force.