Newton's laws of motion Review

Why is it harder for the boy in Image B to get down the hill?

• Motion
• Friction
• Work
• Displacement

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A book falls off the desk. What moves the book towards the floor?

• mass

• friction

• gravity

• speed

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A boy rides a skate board down a hill. Eventually the skate board stops. Which is most responsible for causing the skateboard to stop?

• gravity acting on the skateboard

• friction acting on the skateboard

• the mass of the skateboard

• the mass of the boy

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What was the average speed of a car that traveled 180 miles in 3 hours? (speed = distance÷time)

• 55 mph

• 60 mph

• 180 mph

• 540 mph

John pushed two identical toy cars across the same flat smooth floor. Why did both cars travel the same distance?

• because he applied different forces to the two cars

• because he pushed the cars at the same time

• because he applied the same force to each of the two cars

• because he pushed the cars at different times

Two objects are connected by a rope over a pulley.  According to Newton's Second Law of Motion, the masses will start to move if the

• acceleration of object 1 is greater than acceleration of object 2
• acceleration of object 2 is greater than acceleration of object 1
• mass of object 1 is greater than the mass of object 2
• mass object 2 is greater than the mass of object 1

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Which statement best explains Newton's Third Law of Motion?

• An object at rest tends to stay at rest.
• For every action there is an equal and opposite reaction.
• The acceleration of an object is based on the force applied.
• An object continues its motion until an unbalanced force is applied.

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Which is the best example of Newton's First Law of Motion?

• a basketball thrown in the air falls to the ground
• a soccer ball remains motionless until it is kicked by a player
• a baseball player swings at an approaching ball
• an ice skater pushes back from a wall and moves backwards

An object is resting motionless on a surface. According to Newton's 1st Law, the object will only start to move if

• the net forces on the object equal zero
• an unbalanced force is applied to the object
• the upward force of the object is equal to its acceleration
• two forces that are equal and opposite are applied to the object

As the wheels of a train push down on the track, the track pushes back against the wheels. Which of Newton's laws is used to explain these forces.

• An object at rest tends to stay at rest unless acted upon by an unbalanced force.
• The net force of an object is its mass times its acceleration.
• For every action, there is an equal and opposite reaction.
• Any 2 objects exert a gravitational force of attraction on each other.

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