Physics Test Q2

Doubling the force acting on an object will double the object’s:

• mass

• velocity

• speed

• acceleration

Which of the following objects has the greatest inertia (really means momentum)?

• a 15 kg object moving at a speed of 1.0 m/s

• 10 kg object moving at a speed of 3.0 m/s

• a 5 kg object moving at a speed of 5.0

• a 2 kg object at rest

According to Newton’s second law, when the same force is applied to two objects of different masses,

• the object with smaller mass will experience a greater acceleration.

• the acceleration of the objects is not related to their masses.

• the object with smaller mass will experience a smaller acceleration

• the objects will both experience the same acceleration.

A net force of 30 N accelerates a 120 kg scooter across a level parking lot. What is the scooter’s

acceleration?

• 0.5 m/s²

• .69 m/s²

• .25 m/s²

• 3.2 m/s²

According to the graph at the right, when net force increases, acceleration

• changes randomly

• decreases

• increases

• remains constant

Which statement about the acceleration of an object is correct?

• The acceleration of an object increases as the net force decreases.

• The acceleration of an object decreases as the net force decreases

• The acceleration of an object is not related to net force.

• The acceleration of an object remains constant as the net force

  decreases

A car of mass 1500 kg is driving west. The force pushing the car forward is 3000 N. There is 700 N of air

resistance. Calculate the east-west (x-direction) acceleration.

• 14,700 m/s²

• .65 m/s²

• 1.53 m/s²

• 2300 m/s²

If the net force on an object is zero, then the object is definitely...

• at rest or moving with a constant velocity

• losing mass

• being accelerated

• net forces can never be zero

A net force of 360 N accelerates a 90 kg cyclist up a hill. Calculate her acceleration.

• 3 N

• 4 m/s²

• 129,600 m/s²

• 3 m/s²

A hot-air balloon is acted on by two forces. One force is its weight, equal to 2448 newtons. The second force is a buoyant force acting straight up, equal to 2448 newtons. What change in the motion of the balloon will result from the action of these two forces? Explain your answer