Dynamics

The graph at left shows the relationship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is a representation of the:

• mass of a stopper

• density of a stopper

• acceleration due to gravity

• number of stoppers for each unit of weight

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Which of the following diagrams best represents the gravitational force W. the frictional force f, and the normal force N that act on the block?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-1

Three objects can only move along a straight, level path. The graphs above show the position d of each of the objects plotted as a function of time t. The sum of the forces on the object is zero in which of the cases?

• II

• III

• I and II

• I and III

Tags

NGSS.HS-PS2-1

The 10.0 kg box shown in the figure to the right is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of kinetic friction between the box and the floor is 0.20. The box is moving with:

• acceleration to the left

• acceleration to the right

• constant speed and constant velocity

• constant speed but not constant velocity

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NGSS.HS-PS2-1

A force of 6 N and a force of 10 N can be combined to form a resultant with a magnitude of which of the following?

• 0 N

• 2 N

• 8 N

• 20 N

Tags

NGSS.MS-PS2-2

An object in equilibrium has three forces, F₁ of 30 N, F₂ of 50 N, and F₃ of 70 N, acting on it. The magnitude of

the resultant of F₁ and F₂ is

• 10 N

• 20 N

• 70 N

• 80 N

You hold a rubber ball in your hand. The Newton's third law companion force to the force of gravity on the ball is the force exerted by which object onto what other object?

• ball on the hand

• Earth on the ball

• ball on the Earth

• hand on the ball

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NGSS.HS-PS2-4

A car whose mass is 1500 kg is accelerated uniformly from rest to a speed of 20 m/s in 10 s. The magnitude of the net force accelerating the car is:

• 1000 N

• 2000 N

• 3000 N

• 20000 N

Tags

NGSS.HS-PS2-1

A rope of negligible mass supports a block that weighs 30 N, as shown above. The breaking strength of the rope is 50 N. The largest acceleration that can be given to the block by pulling up on it with the rope without breaking the rope is most nearly

• 6 m/s²

• 6.7 m/s²

• 10 m/s²

• 16.7 m/s²

Tags

NGSS.HS-PS2-1

An 800 kg elevator accelerates downward at 2.0 m/s² . The force exerted by the cable on the elevator is:

• 1.6 kN down

• 1.6 kN up

• 6.4 kN up

• 9.6 kN down

Tags

NGSS.HS-PS2-1