Applications of Newton 2

What force would be required to accelerate a 72 kg. cart from 26 km/h to 10 km/h in 3.5 seconds.

• 329 N

• -329 N

• 740 N

• -740 N

Use your knowledge of science to answer the question.  The frog leaps from its resting position at the lake's bank onto a lily pad. If the frog has a mass of 0.5 kg and the acceleration of the leap is 3 m/s2, what is the force the frog exerts on the lake's bank when leaping?

• 0.2 N

• 0.8 N

• 1.5 N

• 6.0 N

A 1,000 kg truck moving at 10 m/s runs into a concrete wall. It takes 0.5 seconds for the truck to completely stop. What is the magnitude of force exerted on the truck during the collision?

• 1,000 N

• 5,000 N

• 10,000 N

• 20,000 N

If you increase the mass on an object, its acceleration

• decreases
• stays the same
• also increases
• stops

Suppose the force of friction on a sliding object is 25 N. The force needed to maintain a constant velocity is

• more than 25 N.

• 25 N in the direction of the friction force

• less than 25 N.

• 25 N to the direction opposite to the friction force

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is

• 10 times as much as the force on the 1-kg book
•  zero.
• the same as the force on the 1-kg book.
• none of the above

A 10 kg (100N) object sits on a scale in an elevator.  Find the scale reading if the elevator is moving upward at a constant 3m/s.

• 30N
• 100N
• 130N
• 70N

A 10 kg (100N) object sits on a scale in an elevator.  Find the scale reading if the elevator is accelerating upward at 3m/s².

• 30N
• 100N
• 130N
• 70N

A 10 kg (100N) object sits on a scale in an elevator.  Find the scale reading if the elevator is accelerating downward at -3m/s².

• 30N
• 100N
• 130N
• 70N

Use the graph of a 10 kg objects' motion to calculate the net force that must be applied!

• 40 N in a positive direction

• 20 N in a positive direction

• 10 N in a positive direction

• THIS IS IMPOSSIBLE!!!