Which Newton's law of motion is it?

A swimmer pushes back on the water and moves forward.

• Newton's law of motion 1

• Newton's law of motion 2

• Newton's law of motion 3

Answer explanation

The push pushes water back and it causes the swimmer to move forward. It causes an equal and opposite reaction.

It requires less force to move a bicycle than a motorcycle.

• Newton's law of motion 1

• Newton's law of motion 2

• Newton's law of motion 3

Answer explanation

Motorcycle has a bigger mass than a bicycle and based on the formula F= m.a , the bigger is the mass the bigger is the force

Several dogs pulling a sled cause it to accelerate more quickly than just one dog pulling a sled.

• Newton's law of motion 1

• Newton's law of motion 2

• Newton's law of motion 3

Answer explanation

More dogs means more force applied which affects on the acceleration of the sled. It makes the sled move faster.

A bird flaps its wings down and the air pushes the bird upwards.

• Newton's law of motion 1

• Newton's law of motion 2

• Newton's law of motion 3

Answer explanation

Flapping wings push the air down. This keeps the bird flying.

A person is riding in a car, traveling straight. The car comes to a quick stop and the person’s body leans forward against the seatbelt.

• Newton's law of motion 1

• Newton's law of motion 2

• Newton's law of motion 3

Answer explanation

When a man is riding a car. the person moves forward. When the car stop quickly, seatbelt apply force to change the motion of the person.

Pushing a child on a swing is easier than pushing an adult on the same swing.

• Newton's law of motion 1

• Newton's law of motion 2

• Newton's law of motion 3

Answer explanation

Mass of a child is less then mass of an adult so it is easier to accelerate the swing. The less mass, the less force needed.

Two people are playing baseball. The first person hits the ball very hard and the second person lightly bunts the ball. The first person’s ball accelerates more than the second person’s ball.

• Newton's law of motion 1

• Newton's law of motion 2

• Newton's law of motion 3

Answer explanation

The first student hits a ball very hard and it has a greater acceleration than the second student who bunts the ball lightly. More force means more acceleration.

A student leaves a pencil on their desk and the pencil stays in the same spot until another student picks it up.

• Newton's law of motion 1

• Newton's law of motion 2

• Newton's law of motion 3

Answer explanation

Pencil moves because there is force applied. If there was no force then the pencil won't be able to move

You kick a bowling ball and a tennis ball with the same amount of force. The tennis ball travels farther than the bowling ball.

• Newton's law of motion 1

• Newton's law of motion 2

• Newton's law of motion 3

Answer explanation

F = m.a, An object with a low inertia will require a smaller acting force to be accelerated at the same rate as an object with a higher inertia and vice versa. Tennis ball has less inertia.

A picture frame is hanging on a wall and does not move.

• Newton's law of motion 1

• Newton's law of motion 2

• Newton's law of motion 3

Answer explanation

Things that are at rest tend to stay at rest, and there is not a force acting on it so it stays still