Force and Motion Review

A push and a pull are two examples of which the following?

• a force

• velocity

• a law of motion

• a balanced force

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Four students used spring scales to measure the force needed to pull blocks made of different materials up a smooth ramp. All of the blocks moved at the same rate. The students recorded the force needed to move the different blocks: 6 N, 8 N, 7 N, and 5 N. Which of the following is a possible explanation for why the blocks required different amounts of force?

• The blocks all had different masses.

• The blacks all had the same mass but different sizes.

• The blocks had the same mass, but the force of gravity changed.

• Each student exerted the same force, but the friction was different.

Tags

NGSS.MS-PS2-2

When you coast down a hill on a scooter, you move faster and faster. If you continue moving onto a level surface, finally you will stop moving. Which of Newton's laws of motion explains why you stop?

• Newton's first law explains that when you reach the bottom of the hill, you run out of energy, so you stop moving.

• Newton's first law explains that gravity affects you when you move downhill, but not when you move on a level surface.

• Newton's second law explains that no force acts on your scooter on the level surface, so it stops moving.

• Newton's third law explains that friction between the tires and the ground is an unbalanced force that changes your motion.

Tags

NGSS.MS-PS3-5

Four forces are acting on the block shown below. If force F is applied to the block and it does not move, which statement is true?

• F and F(f) are equal

• F and F(g) are equal

• F(f) is greater than F

• F(g) is greater than F

Tags

NGSS.HS-PS2-1

Why is it harder to overcome the inertia of a bowling ball than a basketball?

• because the bowling ball is larger

• because the bowling ball has a greater mass

• because the basketball has less momentum

• because the basketball has greater acceleration

Tags

NGSS.MS-PS2-2

What happens to an object that is acted upon by unbalanced forces?

• it stops moving

• it changes its motion

• it gets cold

• it gets hot

Tags

NGSS.MS-PS2-2

According to Newton's first law of motion, a moving object that is not acted on by an unbalanced force will

• remain in motion

• eventuall come to a stop

• transfer its energy to another object

• accelerate in the absence of friction

According to Newton's second law of motion, what two factors determine an object's acceleration?

• the speed of the object and the power of inertia on the object

• the mass of the object and the amount of force applied to the object

• the shape of the object and the material from which the object is made

• the strength of gravity as it is applied to the object and weight of the object

Tags

NGSS.MS-PS2-2

A rock is balanced on the side of a long, sloping hill. Although the rock is very heavy, a gentle push causes it to start moving down the slope. How can a small force cause a large mass to move?

• The direction of the force is important, but not the amount of force.

• The push on the rock increases the smount of friction, so the rock starts to move.

• The small push balances the forces that are keeping the rock in place and causes it to move.

• The forces on the rock are balanced, and a small additional force causes them to be unbalanced.

Tags

NGSS.MS-PS2-2

Which term names a force of attraction between two objects, even if they are not touching?

• inertia

• gravity

• friction

• unbalanced force

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5