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What is the net force on this box?

• 30 N left
• 25 N right
• 5 N left
• 55 N right

(T or F?) A balanced force is only an object that is not moving. 

• True 
• False

To calculate net force you must

• Add the forces

• Subtract the forces

Two forces are applied to a 17 kg box as shown. The box is on a smooth surface. Which statement best describes the net force and direction the box will move? (8.6)

• 17 N to the right

• 7 N to the left

• 53 N to the right

• 70 N to the right

A wheeled cart is moving to the right at a constant speed. Two forces of equal magnitude are acting upon the cart. Which of the following best describes the forces and motion of the cart?

• Balanced Forces, Constant Speed

• Balanced Forces, Acceleration

• Unbalanced Forces, Constant Speed

• Unbalanced Forces, Acceleration

What is the net force?

• 40 N left
• 0 N Balalnced
• 400 N right
• 40 N right

What will cause an object to move?

• Applied forces
• Balanced forces
• Unbalanced forces

Are forces balanced or unbalanced when a car is moving at a constant speed in a straight line?

• Balanced
• Unbalanced

If the car in the diagram rolls faster and faster as it moves down the ramp, you can be sure that

• there is no friction acting on the object.

• the forces acting on it are unbalanced.

• the net force on the car is 0 N.

• only gravity is acting on the car.

A dog walks a distance of 100 ft in 20 s of time. What is the dog’s speed in feet per second?

• 5 ft/s

• 80 ft/s

• 120 ft/s

• 2000 ft/s