Question 1

A sprinter accelerates uniformly from rest to a speed of $$9.0\ \mathrm{m/s} in$$ $$3.0\ \mathrm{s}. $$What is the sprinter's acceleration?

Accepted Answer

$$2.0\ \mathrm{m/s^2$}$$

Question 2

A motorcycle accelerates from $$20\ \mathrm{km/h} to$$ $$50\ \mathrm{km/h} in$$ $$4.0\ \mathrm{s}. $$What is the average acceleration in $$\mathrm{m/s^2$}$$?

Accepted Answer

$$2.1\ \mathrm{m/s^2$}$$

Question 3

A puck moving at $$18\ \mathrm{m/s}$$ hits a barrier and rebounds at $$12\ \mathrm{m/s} in $$the opposite direction. The collision lasts $$0.3\ \mathrm{s}. $$What is the average acceleration of the puck during the collision?

Accepted Answer

$$-100\ \mathrm{m/s^2$}$$

Question 4

A ball is thrown vertically upward with a speed of $$12\ \mathrm{m/s}. $$Assume that gravitational acceleration is $$g = 9.8\ \mathrm{m/s^2$}$$ [down]. How long does it take to reach its highest point?

Accepted Answer

$$0.82\ \mathrm{s}$$

Question 5

A car travels along a straight road. Its velocity-time graph shows a linearly decreasing velocity from $$20\ \mathrm{m/s} to$$ $$0\ \mathrm{m/s}$$ over $$10\ \mathrm{s}. $$What is the car's acceleration?

Accepted Answer

$$-0.5\ \mathrm{m/s^2$}$$

Question 6

A hockey puck slides across ice and comes to a stop due to friction. If its initial speed is $$8.0\ \mathrm{m/s}$$ and it stops in $$4.0\ \mathrm{s}$$, what is the coefficient of kinetic friction between the puck and the ice? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$0.10$$

Question 7

Calculate the weight on Jupiter of a $$60\ \mathrm{kg}$$ astronaut. (Jupiter's gravitational acceleration is $$24.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$1,488\ \mathrm{N}$$

Question 8

A $$12\ \mathrm{kg}$$ box is pushed across a rough surface with a constant velocity using a horizontal force of $$60\ \mathrm{N}. $$What is the coefficient of kinetic friction? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$0.51$$

Question 9

Two hockey players, Anna ($$55\ \mathrm{kg}) $$and Ben ($$75\ \mathrm{kg}$$), stand on frictionless ice. Anna pushes Ben with a force of $$300\ \mathrm{N}$$ for $$2.0\ \mathrm{s}. $$What is Anna's acceleration during the push?

Accepted Answer

$$5.5\ \mathrm{m/s^2$}$$

Question 10

A net force of $$12\ \mathrm{N}$$ gives mass A an acceleration of $$3.0\ \mathrm{m/s^2$}$$ and mass B an acceleration of $$6.0\ \mathrm{m/s^2$}. $$What is the combined acceleration if A and B are fastened together and acted on by the same force?

Accepted Answer

$$2.0\ \mathrm{m/s^2$}$$

Question 11

A $$2.0\ \mathrm{kg}$$ box is pushed across a rough surface with a constant velocity using a horizontal force of $$10\ \mathrm{N}. $$What is the frictional force acting on the box?

Accepted Answer

$$10\ \mathrm{N}$$

Question 12

A car moves at $$20\ \mathrm{m/s}$$ and comes to rest in $$5.0\ \mathrm{s}$$ due to braking. What is the magnitude of its acceleration?

Accepted Answer

$$4.0\ \mathrm{m/s^2$}$$

Question 13

A $$16\ \mathrm{kg}$$ toolbox is pushed across a rough surface with a constant velocity using a horizontal force of $$60\ \mathrm{N}. $$What is the normal force acting on the box? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$156.8\ \mathrm{N}$$

Question 14

A car accelerates from $$0 to$$ $$30\ \mathrm{m/s} in$$ $$6.0\ \mathrm{s}. $$What is the distance covered during this time?

Accepted Answer

$$180\ \mathrm{m}$$

Question 15

A $$5.0\ \mathrm{kg}$$ mass is acted on by a net force of $$20\ \mathrm{N}. $$What is its acceleration?

Accepted Answer

$$4.0\ \mathrm{m/s^2$}$$

Question 16

A $$2.0\ \mathrm{kg}$$ object is dropped from rest from a height of $$20\ \mathrm{m}. $$Neglecting air resistance, what is its speed just before hitting the ground? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$19.8\ \mathrm{m/s}$$

Question 17

A $$10\ \mathrm{kg}$$ box is pulled with a force of $$50\ \mathrm{N} at an $$angle of $$30^\circ$$ above the horizontal. What is the horizontal component of the pulling force?

Accepted Answer

$$43.3\ \mathrm{N}$$

Question 18

A $$1.5\ \mathrm{kg}$$ object is moving at $$4.0\ \mathrm{m/s} on a $$frictionless surface. What is its kinetic energy?

Accepted Answer

$$12.0\ \mathrm{J}$$

Question 19

A $$2.0\ \mathrm{kg}$$ object is dropped from a height of $$10\ \mathrm{m}. $$How much time does it take to reach the ground? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$1.43\ \mathrm{s}$$

Question 20

A $$3.0\ \mathrm{kg}$$ object is acted on by a net force of $$15\ \mathrm{N}$$ for $$4.0\ \mathrm{s}. $$What is the change in velocity of the object?

Accepted Answer

$$20\ \mathrm{m/s}$$

Physics Midterm Review: Quantitative and Conceptual Problems

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