Forces before Friction

A net force of 25 newtons is applied horizontally to a 10kg block resting on a table. What is the magnitude of the acceleration of the block?

• 0.0 m/s²

• 0.26 m/s²

• 0.40 m/s²

• 2.5 m/s²

A force of 1 newton is equivalent to 1 (think about what units you sub into the formula)

• kgm/s²

• kgm/s

• kgm²/s²

• kg²m²/s²

A 1.5-kg lab cart is accelerated uniformly from rest to a speed of 2.0m/s in 0.5s. What is the magnitude of the force producing this acceleration?

• 0.70 N

• 1.5 N

• 3.0 N

• 6.0 N

A net force of 10N accelerates an object at 5m/s². What net force would be required to accelerate the same object at 1.0m/s²?

• 1.0 N

• 2.0 N

• 5.0 N

• 50. N

As a car is driven south in a straight line with decreasing speed, the acceleration of the car MUST be

• directed northward

• directed southward

• zero

• constant, but not zero

A 2.0kg body is initially traveling at a velocity of 40m/s east. If a constant force of 10N due east is applied to the body for 5.0 seconds, the final speed of the body is

• 15 m/s

• 25 m/s

• 65 m/s

• 130 m/s

The centers of two 15-kg spheres are separated by 3.0m. The magnitude of the gravitational force between the two spheres is approximately

• 1.11x10^-10 N

• 3.34x10^-10 N

• 1.67x10^-9 N

• 5.00x10^-9 N

What is the acceleration due to gravity at a location where a 15-kg mass weighs 45N?

• 675 m/s²

• 9.81 m/s²

• 3.00 m/s²

• 0.333 m/s²

If the magnitude of the gravitational force of Earth on the Moon is F, the magnitude of the gravitational force of the Moon on Earth is

• smaller than F

• larger than F

• equal to F

As an astronaut travels from the surface of Earth to a position that is four times as far away from the center of Earth, the astronaut's

• mass decreases

• mass remains the same

• weight increases

• weight remains the same