Dynamics

What is the net force?

• 17 N Right
• 3 N Right
• 3 N Left
• 17 N Left

The tendency of an object to resist changes in its motion is...

• inertia
• force
• acceleration
• velocity

If the man pushes with an equal amount of force, which object will accelerate more?

• Car because it has more mass

• Lawnmower because it has less mass

• Car because it has less mass

• Lawnmower because it has more mass

Acceleration is a change in...

• Inertia
• Gravity
• Velocity
• Distance

A dictionary weighing 15 Newtons is placed on a desk.

What is the force that the desk exerts on the dictionary?

• none

• 15 N

• 1.5 N

• 150 N

How much force is needed to accelerate a 3kg skateboard at 5m/s²?

• 8N
• 1.6N
• 0.6N
• 15N

The acceleration of objects falling on Earth due to gravity is

• 9.8 m/s

• 9.8 m/s²

• 9.8 g/mL

• 9.8 g/m/m

A girl drops a 7 gram bowling ball and a 1gram rock from a cliff. Which will hit the ground first?

• Bowling Ball

• Rock

• Ignoring air resistance, both will hit at the same time.

• The cliff

The horizontal surface on which the objects shown above slide is frictionless. If M = 2.0 kg, and the tension in string 2 is 12 N, calculate the value of F.

• 20 N

• 25 N

• 30 N

• 40 N

A box weighing 46 newtons rests on an incline that makes an angle of 25° with the horizontal. What is the magnitude of the component of the box’s weight perpendicular to the incline?

• 19N
• 21N
• 42N
• 26N