Force and Motion

What will happen to an object in motion with no unbalanced force acting on it?

• It will continue to accelerate until it reaches the speed of light.

• It will gradually slow down and come to a rest.

• It will continue to move at a constant speed.

• It will initially accelerate but gradually slow down until it comes to a rest.

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NGSS.MS-PS3-1

Lee pushes on a wall to stretch after a long run. He pushes on the wall with 20N of force, yet the wall does not move. Which term best describe the forces in this scenario?

• unbalanced forces

• gravitational forces

• directional forces

• balanced forces

What term best represents the strength of a force?

• direction

• inertia

• friction

• magnitude

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NGSS.MS-PS2-4

Under what conditions will a bowling ball slow down if it is rolling down a bowling lane at constant speed?

• The mass of the ball is reduced.

• The direction of the ball is changed.

• An accelerating force is applied to the ball.

• An unbalanced external force is applied to the ball.

Tags

NGSS.MS-PS2-2

A car is being pushed to the right with a force of 150N encounters a frictional force of 50N to the left. What is the magnitude of the net force acting on the car?

• turn to the left

• turn to the right

• 100N

• 200N

Tags

NGSS.MS-PS2-2

A student pushes against a wall with 30 Newtons of force and the wall does not move. What force does the wall exert on the student?

• 0 Newtons

• less than 30 Newtons

• 30 Newtons

• more than 30 Newtons

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NGSS.MS-PS2-1

Two teams (1 and 2) were playing a game of tug-of-war, and each applied an equal force in opposite directions. How will the rope most likely be affected by the applied forces?

• The rope will not move.

• The rope will shrink in length.

• The rope will move towards team 1.

• The rope will move towards team 2.

Tags

NGSS.MS-PS2-2

Two independent forces, 5N and 10N, are acting on object X as shown in the diagram. What is the best description of these forces

• The forces are balanced; they are opposite in direction and different in magnitude.

• The forces are balanced; they are opposite in direction regardless of their magnitude.

• The forces are unbalanced; they are opposite in direction and different in magnitude.

• The forces are unbalanced; they are opposite in direction regardless of their magnitude.

Tags

NGSS.MS-PS2-2

A teenager is driving a car with here textbook on the seat beside her. She slams on the break, bringing her car to a quick stop. However, the book slides forward off the seat onto the floor. What property is the book demonstrating as it slides off the seat?

• friction

• gravity

• inertia

• mass

What relationship exist between mass and inertia?

• As mass increases, inertia decreases.

• As mass increases, inertia increases.

• Mass cancels the property of inertia.

• Mass stabilizes the property of inertia.