Physics Cba Review

A ball is rolling across a field with a force of 20N. If the force of friction from the field is 3.7N, what would be the net force of the ball?

• 16.3 N Right

• 16.3 N Left

• 23.7 N Right

• 23.7 N Left

Tags

NGSS.MS-PS2-2

According to Newton's Law of Inertia, which of the following objects will change its motion?

• A bike rider on a smooth and level road, pedaling at a constant rate.

• A train pulling on another train, each with the same amount of force.

• A chair sitting on the floor with balanced forces acting in opposite directions.

• A ball rolling across the floor with friction acting in the opposite direction.

Tags

NGSS.MS-PS2-2

According to Newton's Third Law of Action/Reaction, if someone jumps off a skateboard, the skateboard will roll backwards because -

• the mass of the skateboard is the same as the mass of the person jumping off.

• the pull of gravity on the person is the same as the pull of gravity on the skateboard, regardless of size.

• the air resistance on the person is great and the friction on the skateboard is small.

• for the force that sent the person forward, there is an equal and opposite force pushing back on the skateboard.

Tags

NGSS.MS-PS2-1

Which of the following examples accurately describes an object that is accelerating?

• A ball sitting motionless on the floor

• An airplane moving at 500 kilometers per hour

• A car slows down to turn a sharp corner

• A bike moving backward at 3 meters per second

Which of the following graphs displays the data of an object that is accelerating?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-1

If a car is moving on a highway at 70 kilometers per hour, going south, and then turns to travel 70 kilometers per hour going east, what happens to its speed and velocity (assume the car does not slow down to change directions).

• Speed - changing, velocity - constant

• Speed - constant, velocity - changing

• Speed - constant, velocity - constant

• Speed - changing, velocity - changing

Which illustration demonstrates an unbalanced force?

• Picture A

• Picture B

• Picture C

• Picture D

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Alex pushed against two grocery carts with the same amount of force. Cart A moved, but Cart B remained stationary. Which statement best describes why Cart B did not move.

• The more mass an object has, the harder it is to accelerate the object.

• The less mass an object has, the harder it is to accelerate the object.

• The more force applied to an object, the harder it is to accelerate the object.

• The less force applied to an object, the harder it is to accelerate the object.

Tags

NGSS.MS-PS2-2

The time-distance graph shows the motion of two cars A and B. Based on the information in the graph, what can we conclude?

• Car A and Car B are moving at the same speed.

• Car A is moving at a greater speed.

• Car B is moving at a greater speed.

• Car A and Car B are moving in opposite directions.

Tags

NGSS.MS-PS3-1

The provided table shows the properties of four different sample materials. A student has a substance with a density of 1.28 g/cm3. Which sample does the student have?

• 1

• 2

• 3

• 4